Recalls
Mdrive transmission failure to disengage
On april 28, 2020, the office of defects investigation (odi) opened pe20-005 to investigate reports of 2013-2015 mack chu and cxu trucks equipped with mdrive transmissions continuing to push forward when stopping, possibly increasing the risk of a crash. After more field reports were discovered, the scope of the investigation was expanded to cover my 2013-2016 vehicles. The mdrive transmission is macks version of volvos i-shift transmission, an automated manual transmission that allows gear shifting without the use of a clutch pedal. Early i-shift transmissions were recalled (13v-268) to address a missing redundant clutch disengagement switch that could prevent the clutch from automatically disengaging when the brake was applied. If a loss of signal from the brake air pressure switch occurred, the clutch would remain engaged while braking.Although macks mdrive transmission adopted the latest volvo i-shift design and was built with the redundant clutch switch, odi received field reports alleging that the mdrive transmission would not disengage when coming to a stop like the volvo i-shift transmissions in recall 13v-268.After more than a year of information requests, data exchanges and grouping, and analyzing data, odi was able to correlate two versions of transmission software (id 23084009 and id 23084004), with two frequently replaced parts (solenoid valve and cylinder assy clutch) as outliers. However, mack dismissed the replacement parts as being normal service parts for worn clutch systems.According to mack, unlike the i-shift recall, loss of one or more of the switches would not keep the clutch engaged but might cause a delay in the clutch disengaging, possibly due to the software/control system settings, the worn parts and system reaction time.To demonstrate the possible switch failure outcomes, mack outfitted a subject model truck with a panel that could disable each switch on command. During test drives at the mack facility, the demonstrator truck stopped when the brake was applied each time, and the truck did not stall when the brake was applied, even when the clutch was engaged. Even though failure of one of the switches could delay clutch disengagement, the stopping distance would still be shorter than one of the recalled volvo i-shift transmission trucks. With this information, as well as a lack of known crash incidents related to this complaint, odi concludes that the mack vehicles do not present an unreasonable risk to motor vehicle safety. Although odi is closing this pe, mack/volvo should continue improving the transmission control unit software to further refine the clutch disengagement strategy. The closing of this investigation does not constitute a finding by nhtsa that a safety-related defect does not exist. Claims are still being submitted and the agency will continue to monitor the issue and reserves the right to take further action if warranted by new circumstances.
Last updated on 2024-05-11 09:10:31Mdrive transmission failure to disengage
In a review of field reports submitted under early warning reporting (ewr) 49cfr 579.22(c), over several years by mack trucks, the office of defects investigation (odi) identified a trend of drivers who complained that their transmissions failed to disengage from gear while slowing the vehicle. This failure to disengage resulted in the truck wanting to pull through the service brakes when coming to a stop. Affected trucks are equipped with an mdrive automated manual transmissions. The repair has involved the replacement and/or adjustment of the service brake switch.Odi previously investigated (pe13-268) a similar concern on 2007-2012 volvo trucks equipped with an i-shift automated manual transmission in which the clutch would not automatically disengage as intended. The investigation resulted in volvo releasing safety recall 13v-268.Both volvo i-shift and mack mdrive transmissions share similar configurations in their design and function. Mack is a subsidiary of ab volvo who also manufacture volvo trucks.This preliminary evaluation is opened to examine the alleged defect in all affected vehicles.The odi report cited above can be reviewed at: http://www-odi.Nhtsa.Dot.Gov/owners/searchnhtsaid using the following complaint identification number: 10839430
Last updated on 2022-04-03 08:41:57Mdrive transmission failure to disengage
In a review of field reports submitted under early warning reporting (ewr) 49cfr 579.22(c), over several years by mack trucks, the office of defects investigation (odi) identified a trend of drivers who complained that their transmissions failed to disengage from gear while slowing the vehicle. This failure to disengage resulted in the truck wanting to pull through the service brakes when coming to a stop. Affected trucks are equipped with an mdrive automated manual transmissions. The repair has involved the replacement and/or adjustment of the service brake switch.Odi previously investigated (pe13-268) a similar concern on 2007-2012 volvo trucks equipped with an i-shift automated manual transmission in which the clutch would not automatically disengage as intended. The investigation resulted in volvo releasing safety recall 13v-268.Both volvo i-shift and mack mdrive transmissions share similar configurations in their design and function. Mack is a subsidiary of ab volvo who also manufacture volvo trucks.This preliminary evaluation is opened to examine the alleged defect in all affected vehicles.The odi report cited above can be reviewed at: http://www-odi.Nhtsa.Dot.Gov/owners/searchnhtsaid using the following complaint identification number: 10839430
Last updated on 2022-04-07 09:10:17Mdrive transmission failure to disengage
In a review of field reports submitted under early warning reporting (ewr) 49cfr 579.22(c), over several years by mack trucks, the office of defects investigation (odi) identified a trend of drivers who complained that their transmissions failed to disengage from gear while slowing the vehicle. This failure to disengage resulted in the truck wanting to pull through the service brakes when coming to a stop. Affected trucks are equipped with an mdrive automated manual transmissions. The repair has involved the replacement and/or adjustment of the service brake switch.Odi previously investigated (pe13-268) a similar concern on 2007-2012 volvo trucks equipped with an i-shift automated manual transmission in which the clutch would not automatically disengage as intended. The investigation resulted in volvo releasing safety recall 13v-268.Both volvo i-shift and mack mdrive transmissions share similar configurations in their design and function. Mack is a subsidiary of ab volvo who also manufacture volvo trucks.This preliminary evaluation is opened to examine the alleged defect in all affected vehicles.The odi report cited above can be reviewed at: http://www-odi.Nhtsa.Dot.Gov/owners/searchnhtsaid using the following complaint identification number: 10839430
Last updated on 2022-04-03 08:31:57Mdrive transmission failure to disengage
On april 28, 2020, the office of defects investigation (odi) opened pe20-005 to investigate reports of 2013-2015 mack chu and cxu trucks equipped with mdrive transmissions continuing to push forward when stopping, possibly increasing the risk of a crash. After more field reports were discovered, the scope of the investigation was expanded to cover my 2013-2016 vehicles. The mdrive transmission is macks version of volvos i-shift transmission, an automated manual transmission that allows gear shifting without the use of a clutch pedal. Early i-shift transmissions were recalled (13v-268) to address a missing redundant clutch disengagement switch that could prevent the clutch from automatically disengaging when the brake was applied. If a loss of signal from the brake air pressure switch occurred, the clutch would remain engaged while braking.Although macks mdrive transmission adopted the latest volvo i-shift design and was built with the redundant clutch switch, odi received field reports alleging that the mdrive transmission would not disengage when coming to a stop like the volvo i-shift transmissions in recall 13v-268.After more than a year of information requests, data exchanges and grouping, and analyzing data, odi was able to correlate two versions of transmission software (id 23084009 and id 23084004), with two frequently replaced parts (solenoid valve and cylinder assy clutch) as outliers. However, mack dismissed the replacement parts as being normal service parts for worn clutch systems.According to mack, unlike the i-shift recall, loss of one or more of the switches would not keep the clutch engaged but might cause a delay in the clutch disengaging, possibly due to the software/control system settings, the worn parts and system reaction time.To demonstrate the possible switch failure outcomes, mack outfitted a subject model truck with a panel that could disable each switch on command. During test drives at the mack facility, the demonstrator truck stopped when the brake was applied each time, and the truck did not stall when the brake was applied, even when the clutch was engaged. Even though failure of one of the switches could delay clutch disengagement, the stopping distance would still be shorter than one of the recalled volvo i-shift transmission trucks. With this information, as well as a lack of known crash incidents related to this complaint, odi concludes that the mack vehicles do not present an unreasonable risk to motor vehicle safety. Although odi is closing this pe, mack/volvo should continue improving the transmission control unit software to further refine the clutch disengagement strategy. The closing of this investigation does not constitute a finding by nhtsa that a safety-related defect does not exist. Claims are still being submitted and the agency will continue to monitor the issue and reserves the right to take further action if warranted by new circumstances.
Last updated on 2022-09-02 08:30:05Mdrive transmission failure to disengage
In a review of field reports submitted under early warning reporting (ewr) 49cfr 579.22(c), over several years by mack trucks, the office of defects investigation (odi) identified a trend of drivers who complained that their transmissions failed to disengage from gear while slowing the vehicle. This failure to disengage resulted in the truck wanting to pull through the service brakes when coming to a stop. Affected trucks are equipped with an mdrive automated manual transmissions. The repair has involved the replacement and/or adjustment of the service brake switch.Odi previously investigated (pe13-268) a similar concern on 2007-2012 volvo trucks equipped with an i-shift automated manual transmission in which the clutch would not automatically disengage as intended. The investigation resulted in volvo releasing safety recall 13v-268.Both volvo i-shift and mack mdrive transmissions share similar configurations in their design and function. Mack is a subsidiary of ab volvo who also manufacture volvo trucks.This preliminary evaluation is opened to examine the alleged defect in all affected vehicles.The odi report cited above can be reviewed at: http://www-odi.Nhtsa.Dot.Gov/owners/searchnhtsaid using the following complaint identification number: 10839430
Last updated on 2022-04-03 08:38:34Mdrive transmission failure to disengage
There is no summary currently available
Last updated on 2022-12-28 08:19:40Mdrive transmission failure to disengage
In a review of field reports submitted under early warning reporting (ewr) 49cfr 579.22(c), over several years by mack trucks, the office of defects investigation (odi) identified a trend of drivers who complained that their transmissions failed to disengage from gear while slowing the vehicle. This failure to disengage resulted in the truck wanting to pull through the service brakes when coming to a stop. Affected trucks are equipped with an mdrive automated manual transmissions. The repair has involved the replacement and/or adjustment of the service brake switch.Odi previously investigated (pe13-268) a similar concern on 2007-2012 volvo trucks equipped with an i-shift automated manual transmission in which the clutch would not automatically disengage as intended. The investigation resulted in volvo releasing safety recall 13v-268.Both volvo i-shift and mack mdrive transmissions share similar configurations in their design and function. Mack is a subsidiary of ab volvo who also manufacture volvo trucks.This preliminary evaluation is opened to examine the alleged defect in all affected vehicles.The odi report cited above can be reviewed at: http://www-odi.Nhtsa.Dot.Gov/owners/searchnhtsaid using the following complaint identification number: 10839430
Last updated on 2022-04-03 08:30:20Mdrive transmission failure to disengage
On april 28, 2020, the office of defects investigation (odi) opened pe20-005 to investigate reports of 2013-2015 mack chu and cxu trucks equipped with mdrive transmissions continuing to push forward when stopping, possibly increasing the risk of a crash. After more field reports were discovered, the scope of the investigation was expanded to cover my 2013-2016 vehicles. The mdrive transmission is macks version of volvos i-shift transmission, an automated manual transmission that allows gear shifting without the use of a clutch pedal. Early i-shift transmissions were recalled (13v-268) to address a missing redundant clutch disengagement switch that could prevent the clutch from automatically disengaging when the brake was applied. If a loss of signal from the brake air pressure switch occurred, the clutch would remain engaged while braking.Although macks mdrive transmission adopted the latest volvo i-shift design and was built with the redundant clutch switch, odi received field reports alleging that the mdrive transmission would not disengage when coming to a stop like the volvo i-shift transmissions in recall 13v-268.After more than a year of information requests, data exchanges and grouping, and analyzing data, odi was able to correlate two versions of transmission software (id 23084009 and id 23084004), with two frequently replaced parts (solenoid valve and cylinder assy clutch) as outliers. However, mack dismissed the replacement parts as being normal service parts for worn clutch systems.According to mack, unlike the i-shift recall, loss of one or more of the switches would not keep the clutch engaged but might cause a delay in the clutch disengaging, possibly due to the software/control system settings, the worn parts and system reaction time.To demonstrate the possible switch failure outcomes, mack outfitted a subject model truck with a panel that could disable each switch on command. During test drives at the mack facility, the demonstrator truck stopped when the brake was applied each time, and the truck did not stall when the brake was applied, even when the clutch was engaged. Even though failure of one of the switches could delay clutch disengagement, the stopping distance would still be shorter than one of the recalled volvo i-shift transmission trucks. With this information, as well as a lack of known crash incidents related to this complaint, odi concludes that the mack vehicles do not present an unreasonable risk to motor vehicle safety. Although odi is closing this pe, mack/volvo should continue improving the transmission control unit software to further refine the clutch disengagement strategy. The closing of this investigation does not constitute a finding by nhtsa that a safety-related defect does not exist. Claims are still being submitted and the agency will continue to monitor the issue and reserves the right to take further action if warranted by new circumstances.
Last updated on 2024-05-11 09:10:31Mdrive transmission failure to disengage
In a review of field reports submitted under early warning reporting (ewr) 49cfr 579.22(c), over several years by mack trucks, the office of defects investigation (odi) identified a trend of drivers who complained that their transmissions failed to disengage from gear while slowing the vehicle. This failure to disengage resulted in the truck wanting to pull through the service brakes when coming to a stop. Affected trucks are equipped with an mdrive automated manual transmissions. The repair has involved the replacement and/or adjustment of the service brake switch.Odi previously investigated (pe13-268) a similar concern on 2007-2012 volvo trucks equipped with an i-shift automated manual transmission in which the clutch would not automatically disengage as intended. The investigation resulted in volvo releasing safety recall 13v-268.Both volvo i-shift and mack mdrive transmissions share similar configurations in their design and function. Mack is a subsidiary of ab volvo who also manufacture volvo trucks.This preliminary evaluation is opened to examine the alleged defect in all affected vehicles.The odi report cited above can be reviewed at: http://www-odi.Nhtsa.Dot.Gov/owners/searchnhtsaid using the following complaint identification number: 10839430
Last updated on 2022-04-03 08:33:34Mdrive transmission failure to disengage
On april 28, 2020, the office of defects investigation (odi) opened pe20-005 to investigate reports of 2013-2015 mack chu and cxu trucks equipped with mdrive transmissions continuing to push forward when stopping, possibly increasing the risk of a crash. After more field reports were discovered, the scope of the investigation was expanded to cover my 2013-2016 vehicles. The mdrive transmission is macks version of volvos i-shift transmission, an automated manual transmission that allows gear shifting without the use of a clutch pedal. Early i-shift transmissions were recalled (13v-268) to address a missing redundant clutch disengagement switch that could prevent the clutch from automatically disengaging when the brake was applied. If a loss of signal from the brake air pressure switch occurred, the clutch would remain engaged while braking.Although macks mdrive transmission adopted the latest volvo i-shift design and was built with the redundant clutch switch, odi received field reports alleging that the mdrive transmission would not disengage when coming to a stop like the volvo i-shift transmissions in recall 13v-268.After more than a year of information requests, data exchanges and grouping, and analyzing data, odi was able to correlate two versions of transmission software (id 23084009 and id 23084004), with two frequently replaced parts (solenoid valve and cylinder assy clutch) as outliers. However, mack dismissed the replacement parts as being normal service parts for worn clutch systems.According to mack, unlike the i-shift recall, loss of one or more of the switches would not keep the clutch engaged but might cause a delay in the clutch disengaging, possibly due to the software/control system settings, the worn parts and system reaction time.To demonstrate the possible switch failure outcomes, mack outfitted a subject model truck with a panel that could disable each switch on command. During test drives at the mack facility, the demonstrator truck stopped when the brake was applied each time, and the truck did not stall when the brake was applied, even when the clutch was engaged. Even though failure of one of the switches could delay clutch disengagement, the stopping distance would still be shorter than one of the recalled volvo i-shift transmission trucks. With this information, as well as a lack of known crash incidents related to this complaint, odi concludes that the mack vehicles do not present an unreasonable risk to motor vehicle safety. Although odi is closing this pe, mack/volvo should continue improving the transmission control unit software to further refine the clutch disengagement strategy. The closing of this investigation does not constitute a finding by nhtsa that a safety-related defect does not exist. Claims are still being submitted and the agency will continue to monitor the issue and reserves the right to take further action if warranted by new circumstances.
Last updated on 2024-05-11 09:10:31Mdrive transmission failure to disengage
In a review of field reports submitted under early warning reporting (ewr) 49cfr 579.22(c), over several years by mack trucks, the office of defects investigation (odi) identified a trend of drivers who complained that their transmissions failed to disengage from gear while slowing the vehicle. This failure to disengage resulted in the truck wanting to pull through the service brakes when coming to a stop. Affected trucks are equipped with an mdrive automated manual transmissions. The repair has involved the replacement and/or adjustment of the service brake switch.Odi previously investigated (pe13-268) a similar concern on 2007-2012 volvo trucks equipped with an i-shift automated manual transmission in which the clutch would not automatically disengage as intended. The investigation resulted in volvo releasing safety recall 13v-268.Both volvo i-shift and mack mdrive transmissions share similar configurations in their design and function. Mack is a subsidiary of ab volvo who also manufacture volvo trucks.This preliminary evaluation is opened to examine the alleged defect in all affected vehicles.The odi report cited above can be reviewed at: http://www-odi.Nhtsa.Dot.Gov/owners/searchnhtsaid using the following complaint identification number: 10839430
Last updated on 2022-04-03 08:30:20Mdrive transmission failure to disengage
On april 28, 2020, the office of defects investigation (odi) opened pe20-005 to investigate reports of 2013-2015 mack chu and cxu trucks equipped with mdrive transmissions continuing to push forward when stopping, possibly increasing the risk of a crash. After more field reports were discovered, the scope of the investigation was expanded to cover my 2013-2016 vehicles. The mdrive transmission is macks version of volvos i-shift transmission, an automated manual transmission that allows gear shifting without the use of a clutch pedal. Early i-shift transmissions were recalled (13v-268) to address a missing redundant clutch disengagement switch that could prevent the clutch from automatically disengaging when the brake was applied. If a loss of signal from the brake air pressure switch occurred, the clutch would remain engaged while braking.Although macks mdrive transmission adopted the latest volvo i-shift design and was built with the redundant clutch switch, odi received field reports alleging that the mdrive transmission would not disengage when coming to a stop like the volvo i-shift transmissions in recall 13v-268.After more than a year of information requests, data exchanges and grouping, and analyzing data, odi was able to correlate two versions of transmission software (id 23084009 and id 23084004), with two frequently replaced parts (solenoid valve and cylinder assy clutch) as outliers. However, mack dismissed the replacement parts as being normal service parts for worn clutch systems.According to mack, unlike the i-shift recall, loss of one or more of the switches would not keep the clutch engaged but might cause a delay in the clutch disengaging, possibly due to the software/control system settings, the worn parts and system reaction time.To demonstrate the possible switch failure outcomes, mack outfitted a subject model truck with a panel that could disable each switch on command. During test drives at the mack facility, the demonstrator truck stopped when the brake was applied each time, and the truck did not stall when the brake was applied, even when the clutch was engaged. Even though failure of one of the switches could delay clutch disengagement, the stopping distance would still be shorter than one of the recalled volvo i-shift transmission trucks. With this information, as well as a lack of known crash incidents related to this complaint, odi concludes that the mack vehicles do not present an unreasonable risk to motor vehicle safety. Although odi is closing this pe, mack/volvo should continue improving the transmission control unit software to further refine the clutch disengagement strategy. The closing of this investigation does not constitute a finding by nhtsa that a safety-related defect does not exist. Claims are still being submitted and the agency will continue to monitor the issue and reserves the right to take further action if warranted by new circumstances.
Last updated on 2022-09-02 08:33:49Mdrive transmission failure to disengage
In a review of field reports submitted under early warning reporting (ewr) 49cfr 579.22(c), over several years by mack trucks, the office of defects investigation (odi) identified a trend of drivers who complained that their transmissions failed to disengage from gear while slowing the vehicle. This failure to disengage resulted in the truck wanting to pull through the service brakes when coming to a stop. Affected trucks are equipped with an mdrive automated manual transmissions. The repair has involved the replacement and/or adjustment of the service brake switch.Odi previously investigated (pe13-268) a similar concern on 2007-2012 volvo trucks equipped with an i-shift automated manual transmission in which the clutch would not automatically disengage as intended. The investigation resulted in volvo releasing safety recall 13v-268.Both volvo i-shift and mack mdrive transmissions share similar configurations in their design and function. Mack is a subsidiary of ab volvo who also manufacture volvo trucks.This preliminary evaluation is opened to examine the alleged defect in all affected vehicles.The odi report cited above can be reviewed at: http://www-odi.Nhtsa.Dot.Gov/owners/searchnhtsaid using the following complaint identification number: 10839430
Last updated on 2022-04-03 08:30:20Mdrive transmission failure to disengage
On april 28, 2020, the office of defects investigation (odi) opened pe20-005 to investigate reports of 2013-2015 mack chu and cxu trucks equipped with mdrive transmissions continuing to push forward when stopping, possibly increasing the risk of a crash. After more field reports were discovered, the scope of the investigation was expanded to cover my 2013-2016 vehicles. The mdrive transmission is macks version of volvos i-shift transmission, an automated manual transmission that allows gear shifting without the use of a clutch pedal. Early i-shift transmissions were recalled (13v-268) to address a missing redundant clutch disengagement switch that could prevent the clutch from automatically disengaging when the brake was applied. If a loss of signal from the brake air pressure switch occurred, the clutch would remain engaged while braking.Although macks mdrive transmission adopted the latest volvo i-shift design and was built with the redundant clutch switch, odi received field reports alleging that the mdrive transmission would not disengage when coming to a stop like the volvo i-shift transmissions in recall 13v-268.After more than a year of information requests, data exchanges and grouping, and analyzing data, odi was able to correlate two versions of transmission software (id 23084009 and id 23084004), with two frequently replaced parts (solenoid valve and cylinder assy clutch) as outliers. However, mack dismissed the replacement parts as being normal service parts for worn clutch systems.According to mack, unlike the i-shift recall, loss of one or more of the switches would not keep the clutch engaged but might cause a delay in the clutch disengaging, possibly due to the software/control system settings, the worn parts and system reaction time.To demonstrate the possible switch failure outcomes, mack outfitted a subject model truck with a panel that could disable each switch on command. During test drives at the mack facility, the demonstrator truck stopped when the brake was applied each time, and the truck did not stall when the brake was applied, even when the clutch was engaged. Even though failure of one of the switches could delay clutch disengagement, the stopping distance would still be shorter than one of the recalled volvo i-shift transmission trucks. With this information, as well as a lack of known crash incidents related to this complaint, odi concludes that the mack vehicles do not present an unreasonable risk to motor vehicle safety. Although odi is closing this pe, mack/volvo should continue improving the transmission control unit software to further refine the clutch disengagement strategy. The closing of this investigation does not constitute a finding by nhtsa that a safety-related defect does not exist. Claims are still being submitted and the agency will continue to monitor the issue and reserves the right to take further action if warranted by new circumstances.
Last updated on 2022-09-02 08:35:05Mdrive transmission failure to disengage
In a review of field reports submitted under early warning reporting (ewr) 49cfr 579.22(c), over several years by mack trucks, the office of defects investigation (odi) identified a trend of drivers who complained that their transmissions failed to disengage from gear while slowing the vehicle. This failure to disengage resulted in the truck wanting to pull through the service brakes when coming to a stop. Affected trucks are equipped with an mdrive automated manual transmissions. The repair has involved the replacement and/or adjustment of the service brake switch.Odi previously investigated (pe13-268) a similar concern on 2007-2012 volvo trucks equipped with an i-shift automated manual transmission in which the clutch would not automatically disengage as intended. The investigation resulted in volvo releasing safety recall 13v-268.Both volvo i-shift and mack mdrive transmissions share similar configurations in their design and function. Mack is a subsidiary of ab volvo who also manufacture volvo trucks.This preliminary evaluation is opened to examine the alleged defect in all affected vehicles.The odi report cited above can be reviewed at: http://www-odi.Nhtsa.Dot.Gov/owners/searchnhtsaid using the following complaint identification number: 10839430
Last updated on 2022-04-03 08:40:15Mdrive transmission failure to disengage
On april 28, 2020, the office of defects investigation (odi) opened pe20-005 to investigate reports of 2013-2015 mack chu and cxu trucks equipped with mdrive transmissions continuing to push forward when stopping, possibly increasing the risk of a crash. After more field reports were discovered, the scope of the investigation was expanded to cover my 2013-2016 vehicles. The mdrive transmission is macks version of volvos i-shift transmission, an automated manual transmission that allows gear shifting without the use of a clutch pedal. Early i-shift transmissions were recalled (13v-268) to address a missing redundant clutch disengagement switch that could prevent the clutch from automatically disengaging when the brake was applied. If a loss of signal from the brake air pressure switch occurred, the clutch would remain engaged while braking.Although macks mdrive transmission adopted the latest volvo i-shift design and was built with the redundant clutch switch, odi received field reports alleging that the mdrive transmission would not disengage when coming to a stop like the volvo i-shift transmissions in recall 13v-268.After more than a year of information requests, data exchanges and grouping, and analyzing data, odi was able to correlate two versions of transmission software (id 23084009 and id 23084004), with two frequently replaced parts (solenoid valve and cylinder assy clutch) as outliers. However, mack dismissed the replacement parts as being normal service parts for worn clutch systems.According to mack, unlike the i-shift recall, loss of one or more of the switches would not keep the clutch engaged but might cause a delay in the clutch disengaging, possibly due to the software/control system settings, the worn parts and system reaction time.To demonstrate the possible switch failure outcomes, mack outfitted a subject model truck with a panel that could disable each switch on command. During test drives at the mack facility, the demonstrator truck stopped when the brake was applied each time, and the truck did not stall when the brake was applied, even when the clutch was engaged. Even though failure of one of the switches could delay clutch disengagement, the stopping distance would still be shorter than one of the recalled volvo i-shift transmission trucks. With this information, as well as a lack of known crash incidents related to this complaint, odi concludes that the mack vehicles do not present an unreasonable risk to motor vehicle safety. Although odi is closing this pe, mack/volvo should continue improving the transmission control unit software to further refine the clutch disengagement strategy. The closing of this investigation does not constitute a finding by nhtsa that a safety-related defect does not exist. Claims are still being submitted and the agency will continue to monitor the issue and reserves the right to take further action if warranted by new circumstances.
Last updated on 2024-05-11 09:10:31Mdrive transmission failure to disengage
In a review of field reports submitted under early warning reporting (ewr) 49cfr 579.22(c), over several years by mack trucks, the office of defects investigation (odi) identified a trend of drivers who complained that their transmissions failed to disengage from gear while slowing the vehicle. This failure to disengage resulted in the truck wanting to pull through the service brakes when coming to a stop. Affected trucks are equipped with an mdrive automated manual transmissions. The repair has involved the replacement and/or adjustment of the service brake switch.Odi previously investigated (pe13-268) a similar concern on 2007-2012 volvo trucks equipped with an i-shift automated manual transmission in which the clutch would not automatically disengage as intended. The investigation resulted in volvo releasing safety recall 13v-268.Both volvo i-shift and mack mdrive transmissions share similar configurations in their design and function. Mack is a subsidiary of ab volvo who also manufacture volvo trucks.This preliminary evaluation is opened to examine the alleged defect in all affected vehicles.The odi report cited above can be reviewed at: http://www-odi.Nhtsa.Dot.Gov/owners/searchnhtsaid using the following complaint identification number: 10839430
Last updated on 2022-04-03 08:41:57Mdrive transmission failure to disengage
On april 28, 2020, the office of defects investigation (odi) opened pe20-005 to investigate reports of 2013-2015 mack chu and cxu trucks equipped with mdrive transmissions continuing to push forward when stopping, possibly increasing the risk of a crash. After more field reports were discovered, the scope of the investigation was expanded to cover my 2013-2016 vehicles. The mdrive transmission is macks version of volvos i-shift transmission, an automated manual transmission that allows gear shifting without the use of a clutch pedal. Early i-shift transmissions were recalled (13v-268) to address a missing redundant clutch disengagement switch that could prevent the clutch from automatically disengaging when the brake was applied. If a loss of signal from the brake air pressure switch occurred, the clutch would remain engaged while braking.Although macks mdrive transmission adopted the latest volvo i-shift design and was built with the redundant clutch switch, odi received field reports alleging that the mdrive transmission would not disengage when coming to a stop like the volvo i-shift transmissions in recall 13v-268.After more than a year of information requests, data exchanges and grouping, and analyzing data, odi was able to correlate two versions of transmission software (id 23084009 and id 23084004), with two frequently replaced parts (solenoid valve and cylinder assy clutch) as outliers. However, mack dismissed the replacement parts as being normal service parts for worn clutch systems.According to mack, unlike the i-shift recall, loss of one or more of the switches would not keep the clutch engaged but might cause a delay in the clutch disengaging, possibly due to the software/control system settings, the worn parts and system reaction time.To demonstrate the possible switch failure outcomes, mack outfitted a subject model truck with a panel that could disable each switch on command. During test drives at the mack facility, the demonstrator truck stopped when the brake was applied each time, and the truck did not stall when the brake was applied, even when the clutch was engaged. Even though failure of one of the switches could delay clutch disengagement, the stopping distance would still be shorter than one of the recalled volvo i-shift transmission trucks. With this information, as well as a lack of known crash incidents related to this complaint, odi concludes that the mack vehicles do not present an unreasonable risk to motor vehicle safety. Although odi is closing this pe, mack/volvo should continue improving the transmission control unit software to further refine the clutch disengagement strategy. The closing of this investigation does not constitute a finding by nhtsa that a safety-related defect does not exist. Claims are still being submitted and the agency will continue to monitor the issue and reserves the right to take further action if warranted by new circumstances.
Last updated on 2024-05-11 09:10:31Mdrive transmission failure to disengage
In a review of field reports submitted under early warning reporting (ewr) 49cfr 579.22(c), over several years by mack trucks, the office of defects investigation (odi) identified a trend of drivers who complained that their transmissions failed to disengage from gear while slowing the vehicle. This failure to disengage resulted in the truck wanting to pull through the service brakes when coming to a stop. Affected trucks are equipped with an mdrive automated manual transmissions. The repair has involved the replacement and/or adjustment of the service brake switch.Odi previously investigated (pe13-268) a similar concern on 2007-2012 volvo trucks equipped with an i-shift automated manual transmission in which the clutch would not automatically disengage as intended. The investigation resulted in volvo releasing safety recall 13v-268.Both volvo i-shift and mack mdrive transmissions share similar configurations in their design and function. Mack is a subsidiary of ab volvo who also manufacture volvo trucks.This preliminary evaluation is opened to examine the alleged defect in all affected vehicles.The odi report cited above can be reviewed at: http://www-odi.Nhtsa.Dot.Gov/owners/searchnhtsaid using the following complaint identification number: 10839430
Last updated on 2022-04-03 08:36:58Mdrive transmission failure to disengage
There is no summary currently available
Last updated on 2022-12-28 08:14:57Mdrive transmission failure to disengage
In a review of field reports submitted under early warning reporting (ewr) 49cfr 579.22(c), over several years by mack trucks, the office of defects investigation (odi) identified a trend of drivers who complained that their transmissions failed to disengage from gear while slowing the vehicle. This failure to disengage resulted in the truck wanting to pull through the service brakes when coming to a stop. Affected trucks are equipped with an mdrive automated manual transmissions. The repair has involved the replacement and/or adjustment of the service brake switch.Odi previously investigated (pe13-268) a similar concern on 2007-2012 volvo trucks equipped with an i-shift automated manual transmission in which the clutch would not automatically disengage as intended. The investigation resulted in volvo releasing safety recall 13v-268.Both volvo i-shift and mack mdrive transmissions share similar configurations in their design and function. Mack is a subsidiary of ab volvo who also manufacture volvo trucks.This preliminary evaluation is opened to examine the alleged defect in all affected vehicles.The odi report cited above can be reviewed at: http://www-odi.Nhtsa.Dot.Gov/owners/searchnhtsaid using the following complaint identification number: 10839430
Last updated on 2022-04-03 08:40:15Mdrive transmission failure to disengage
On april 28, 2020, the office of defects investigation (odi) opened pe20-005 to investigate reports of 2013-2015 mack chu and cxu trucks equipped with mdrive transmissions continuing to push forward when stopping, possibly increasing the risk of a crash. After more field reports were discovered, the scope of the investigation was expanded to cover my 2013-2016 vehicles. The mdrive transmission is macks version of volvos i-shift transmission, an automated manual transmission that allows gear shifting without the use of a clutch pedal. Early i-shift transmissions were recalled (13v-268) to address a missing redundant clutch disengagement switch that could prevent the clutch from automatically disengaging when the brake was applied. If a loss of signal from the brake air pressure switch occurred, the clutch would remain engaged while braking.Although macks mdrive transmission adopted the latest volvo i-shift design and was built with the redundant clutch switch, odi received field reports alleging that the mdrive transmission would not disengage when coming to a stop like the volvo i-shift transmissions in recall 13v-268.After more than a year of information requests, data exchanges and grouping, and analyzing data, odi was able to correlate two versions of transmission software (id 23084009 and id 23084004), with two frequently replaced parts (solenoid valve and cylinder assy clutch) as outliers. However, mack dismissed the replacement parts as being normal service parts for worn clutch systems.According to mack, unlike the i-shift recall, loss of one or more of the switches would not keep the clutch engaged but might cause a delay in the clutch disengaging, possibly due to the software/control system settings, the worn parts and system reaction time.To demonstrate the possible switch failure outcomes, mack outfitted a subject model truck with a panel that could disable each switch on command. During test drives at the mack facility, the demonstrator truck stopped when the brake was applied each time, and the truck did not stall when the brake was applied, even when the clutch was engaged. Even though failure of one of the switches could delay clutch disengagement, the stopping distance would still be shorter than one of the recalled volvo i-shift transmission trucks. With this information, as well as a lack of known crash incidents related to this complaint, odi concludes that the mack vehicles do not present an unreasonable risk to motor vehicle safety. Although odi is closing this pe, mack/volvo should continue improving the transmission control unit software to further refine the clutch disengagement strategy. The closing of this investigation does not constitute a finding by nhtsa that a safety-related defect does not exist. Claims are still being submitted and the agency will continue to monitor the issue and reserves the right to take further action if warranted by new circumstances.
Last updated on 2022-09-02 08:30:05Mdrive transmission failure to disengage
In a review of field reports submitted under early warning reporting (ewr) 49cfr 579.22(c), over several years by mack trucks, the office of defects investigation (odi) identified a trend of drivers who complained that their transmissions failed to disengage from gear while slowing the vehicle. This failure to disengage resulted in the truck wanting to pull through the service brakes when coming to a stop. Affected trucks are equipped with an mdrive automated manual transmissions. The repair has involved the replacement and/or adjustment of the service brake switch.Odi previously investigated (pe13-268) a similar concern on 2007-2012 volvo trucks equipped with an i-shift automated manual transmission in which the clutch would not automatically disengage as intended. The investigation resulted in volvo releasing safety recall 13v-268.Both volvo i-shift and mack mdrive transmissions share similar configurations in their design and function. Mack is a subsidiary of ab volvo who also manufacture volvo trucks.This preliminary evaluation is opened to examine the alleged defect in all affected vehicles.The odi report cited above can be reviewed at: http://www-odi.Nhtsa.Dot.Gov/owners/searchnhtsaid using the following complaint identification number: 10839430
Last updated on 2022-04-03 08:31:57