Mack Mru 2018

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• Vehicle roll away investigation # PE20003

  The office of defects investigation (odi) received a tip from a large fleet operator of refuse trucks about a potential defect condition that may result in a vehicle roll away. The subject vehicles are single-unit trucks equipped with certain bendix pp-1 push-pull pneumatic park brake control valves. These subject components are mounted to the dashboard and allow the driver to apply and release the parking brakes. They have a 1/8? Npt threaded fitting in the exhaust port and an exhaust pipe to vent exhaust air outside the truck cab. The subject components may experience an accelerated wear out condition in certain severe-duty applications with high-frequency use of the parking brakes. When the knob is pulled out to apply the parking brakes, supply side air may continuously leak past the worn valve and escape through the exhaust port. This wear out condition may not be readily detected by the driver because the sound is muffled by the exhaust pipe configuration. An exhaust flow restriction, such as an insufficient diameter exhaust port, threaded fitting or exhaust pipe, may allow back-pressure to develop and pressurize the delivery port. This may inadvertently send a signal to the park control port of the sr-7 spring brake modulating control valve to release the parking brakes, possibly resulting in a vehicle roll away.The reporting fleet operator is aware of at least 4 roll away incidents related to the alleged defect on subject vehicles in the united states. In one case, surveillance video recorded the driver applying the parking brakes moments before the vehicle rolled away. In some cases, the root cause was determined by post-incident examination of subject components by the component supplier and/or by a third-party forensic engineering company hired by the fleet operator. In one incident, a subject vehicle rolled more than 100 meters away and crashed into a parked car and a residential structure, causing in excess of $150,000 in property damage. In another incident, a subject vehicle rolled away and crashed into several other refuse trucks parked at the depot. The reported injury incident occurred when a driver dumped a load of refuse at a landfill, pulled into the clean out area, set the parking brakes, locked out the main battery disconnect and proceeded into the rear body to perform normal clean out duties. While inside the rear body, the driver reportedly heard the sound of rushing air, the parking brakes reportedly released and the truck began to roll away. In a panic, the driver jumped out of the moving vehicle and broke his ankle, which later required surgery. The truck came to rest approximately 50 meters away against a dirt berm. A preliminary evaluation has been opened to assess the alleged defect.
  

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2018 mack gru with 40k has two cracked front wheels made by alcoa. We have 10 other trucks 2012 to 2019 with same wheels and no cracks. After little research on the internet it is obvious many other people are having this problem on buses, rvs, and trucks. Strange we would have 2 on same truck and no others. It is easy to assume the aluminum alloy is not right. Very dangerous!!!! Pictures attached, you are welcome to wheels, not looking for anything, just giving information

2018 mack gru with 40k has two cracked front wheels made by alcoa. We have 10 other trucks 2012 to 2019 with same wheels and no cracks. After little research on the internet it is obvious many other people are having this problem on buses, rvs, and trucks. Strange we would have 2 on same truck and no others. It is easy to assume the aluminum alloy is not right. Very dangerous!!!! Pictures attached, you are welcome to wheels, not looking for anything, just giving information

Common OBD-II Error Codes

• P1052 [1] P1052
• P202D [2] Reductant Leakage
• P208E [7] Reductant Injection Valve Stuck Closed Bank 1 Unit 1
• P103B [6] P103B
• P10AE [1] P10AE
• P215A [1] Vehicle Speed - Wheel Speed Correlation
• P1074 [1] P1074
• P1058 [1] P1058
• P2080 [2] Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 1
• P2084 [2] Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 2
• P242B [2] Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 3
• U029D [1] Lost Communication With NOX Sensor "A"
• U029E [1] Lost Communication With NOX Sensor "B"
• U02A3 [1] U02A3
• P0201 [1] Injector Circuit Malfunction - Cylinder 1
• P0202 [1] Injector Circuit Malfunction - Cylinder 2
• P0203 [1] Injector Circuit Malfunction - Cylinder 3
• P0204 [1] Injector Circuit Malfunction - Cylinder 4
• P0205 [1] Injector Circuit Malfunction - Cylinder 5
• P0206 [1] Injector Circuit Malfunction - Cylinder 6
• P249F [3] Excessive time to enter closed loop Diesel particulate filter (DPF) regeneration control
• P24A0 [3] Closed loop Diesel particulate filter (DPF) regeneration control, control limit reached – temperature too low
• P205B [1] Reductant Tank Temperature Sensor Circuit Range/Performance
• P0420 [6] Catalyst System Efficiency Below Threshold (Bank 1)
• U0001 [1] High Speed CAN Communication Bus
• U0010 [1] Medium Speed CAN Communication Bus
• P26E8 [1] P26E8
• P24F6 [1] P24F6
• P24F7 [1] P24F7
• P0069 [4] Manifold Absolute Pressure - Barometric Pressure Correlation
• P0191 [4] Fuel Rail Pressure Sensor A Circuit Range/Performance
• P240F [4] ISO/SAE Reserved
• P10EC [4] P10EC
• P009E [6] Fuel Pressure Relief Control Performance/Stuck Off
• P1072 [1] P1072
• P009B [2] Fuel Pressure Relief Control Circuit/Open
• P0194 [3] Fuel Rail Pressure Sensor A Circuit Intermittent
• P016E [3] ISO/SAE Reserved
• P20EE [4] SCR NOx Catalyst Efficiency Below Threshold Bank 1
• P103C [4] P103C
• P0087 [4] Fuel Rail/System Pressure - Too Low
• P008A [1] Low Pressure Fuel System Pressure - Too Low
• P0094 [2] Fuel System Leak Detected - Small Leak
• P228F [3] Fuel Pressure Regulator 1 Exceeded Learning Limits - Too High
• P0257 [2] Injection Pump Fuel Metering Control B Range/Performance Injector)
• P016F [3] ISO/SAE Reserved
• P00C6 [1] Fuel rail pressure (FRP) – engine cranking – pressure too low
• P2A17 [2] P2A17
• P2A1F [2] P2A1F
• C0020 [1] ABS Pump Motor Control (Subfault)
• P1021 [1] P1021
• P040A [1] Exhaust Gas Recirculation Temperature Sensor "A" Circuit
• P040B [1] Exhaust Gas Recirculation Temperature Sensor "A" Circuit Range/Performance
• P1121 [2] Engine Coolant sensor out of range/ECT Sensor Out Of Self Test Range
• P0401 [1] Exhaust Gas Recirculation Flow Insufficient Detected
• P0402 [2] Exhaust Gas Recirculation Flow Excessive Detected
• P04DD [1] P04DD
• P1031 [2] P1031
• P24DA [2] P24DA
• P02FA [4] Diesel Intake Air Flow Position Sensor Minimum/Maximum Stop Performance
• P2459 [2] Diesel Particulate Filter Regeneration Frequency
• P0471 [2] Exhaust Pressure Sensor "A" Circuit Range/Performance
• P20E8 [1] Reductant Pressure Too Low
• P0422 [2] Main Catalyst Efficiency Below Threshold (Bank 1)
• P226C [1] ISO/SAE Reserved