PIP5369C

Bulletin No.: PIP5369C
Published date: 04/9/2019
Preliminary Information
PIP5369C Service 4wd Message C0398
Models
Brand:
Model:
Model Years:
VIN:
from
to
Engine:
Transmissions:
Chevrolet
Silverado 1500
2014 - 2018
All
All
All
All
Chevrolet
Silverado LD
2019
All
All
All
All
Chevrolet
Suburban
2015 - 2019
All
All
All
All
Chevrolet
Tahoe
2015 - 2019
All
All
All
All
GMC
Sierra 1500
2014 - 2018
All
All
All
All
GMC
Sierra Limited
2019
All
All
All
All
GMC
Yukon
2015 - 2019
All
All
All
All
Cadillac
Escalade
2015 - 2019
All
All
All
All
Cadillac
Escalade ESV
2015 - 2019
All
All
All
All
GMC
Canyon
2015 - 2019
All
All
All
All
Chevrolet
Colorado
2019
All
All
All
All
Supersession Statement:
This PI was superseded to update model years. Please discard PIP5369B.
Condition / Concern
Some customers may comment on a "Service 4wd" message displayed in the DIC. upon
investigation dealer may notice a C0398 in the TCCM along with a U0403 and U0102 in
various other modules.
Recommendations / Instructions
Please read this document completely to ensure the best chance of accurately diagnosing
and repairing a 0398.
When DTCs set in the TCCM it also causes U0403 to set in various modules along with the
U0102. Correct the DTCs in the TCCM first.
When diagnosing a C0398 if there are any other diagnostic trouble codes related to transfer
case actuator position sensor (IPS) or rotational position sensor (RPS) diagnose and repair
those first.
Please read this document completely to ensure the best chance of accurately diagnosing
and repairing a 0398. Please DO NOT program the transfer case control module if the latest
software is already installed as that will delete the freeze frame failure records. ONLY data in
the freeze frame failure records in vehicles having the latest software/calibration should be
utilized.
Starting with 2014 1500 Sierra and Silverado pickups, software changed and changed the
default actions when certain diagnostic trouble codes set and the criteria for setting those
diagnostic trouble codes. The software then went into 2015 utilities and Colorado and
Canyon pickups.
Over the years there were hardware build variations and the software was too sensitive
causing some of these diagnostic trouble codes to set intermittently and extremely hard to
diagnose. For any of these vehicles setting a 0398 with any other C code in the transfer case
control module diagnose and repair those diagnostic trouble codes first. If the vehicle has a
0398 and is the only C code in the transfer case control module proceed to the following
appropriate section based on year and model. Other than what is listed below there should
be no need for part replacement on the first visit.
For 2014-2015 Silverado, Sierra and 2015 Tahoe, Suburban, Yukon, Escalade built with RPO
NQH and WITHOUT AVF ensure that the transfer case control module has the latest software.
This can be identified in tis2web as under the Active Transfer Case tab the software
description will be "New calibration (Version 9.2) to address field issue of setting DTC C0398
while being driven in AUTO mode for 1 hour due to the IPS sensor drifting." If the description
contains (version 9.2) then go ahead and program the module with that software.
NOTE: if in the calibration history (Version 9.2) is listed in the history and there is a newer
version available that also is acceptable.
If the description is "New calibrations for improved operation" and that is the latest
calibration and (version 9.2) does NOT show up anywhere in the calibration description
history then replace the transfer case control module and reprogram.
NOTE: Not all transfer case control modules will need to be replaced, some modules are
unable to path to 9.2 in tis2web.
Some 2016 vehicles may have already received the updated software if SUB 28770 shows to
be closed in IVH then the vehicle already contains the latest TCCM software and should not
be reprogrammed again.
For 2015-2019 model year full size vehicles built with RPOs NQH and AVF including Silverado,
Sierra, Tahoe, Suburban, Yukon, Yukon XL, Yukon Denali, Escalade, Escalade ESV ensure that
the transfer case control module has the latest software. This can be identified in tis2web as
under the Active Transfer Case tab the software description will be "New calibration (Version
9.2) to address field issue of setting DTC C0398 while being driven in AUTO mode for 1 hour
due to the IPS sensor drifting." If the description contains (version 9.2) then go ahead and
program the module with that software.
NOTE: if in the calibration history (Version 9.2) is listed in the history and there is a newer
version available that also is acceptable.
For 2015-2019 model year mid size vehicles built with RPO NQ6 including Colorado and
Canyon ensure that the transfer case control module has the latest software. This can be
identified in tis2web as under the Active Transfer Case tab the software description will be
"New calibration (Version 9.2) to address field issue of setting DTC C0398 while being driven
in AUTO mode for 1 hour due to the IPS sensor drifting." If the description contains (version
9.2) then go ahead and program the module with that software.
NOTE: if in the calibration history (Version 9.2) is listed in the history and there is a newer
version available that also is acceptable.
Once the vehicle has the latest software including the (version 9.2) description this should
correct all previous issues that could have caused a 0398 to set due to hardware build
tolerances. The diagnostic trouble code can still set based on criteria in service information.
Since the default actions now are only current on the key cycle that the diagnostic trouble
code set it is possible for the customer to bring the vehicle in stating there was a service 4
wheel drive message but it is not currently displayed. If the diagnostic trouble code is
history then go in and look at the freeze frame data and pay close attention to the Range
Actuator Position Sensor, Transfer Case Range Position Sensor, Variation Between Transfer
Case Range Position Sensor and Range Actuator Position Sensor, Variation Allowed Between
Transfer Case Range Position Sensor and Range Actuator Position Sensor.
For issues related to the Range Actuator Position Sensor position that is intermittent then
inspect circuits 7473, 7474, 7475, 7476 between the transfer case control module and the
actuator motor. Look for terminal tension, backed out terminals, corrosion, missing weather
pack connections, and wire crimping.
For issues related to Transfer Case Range Position Sensor position that is intermittent then
inspect circuits 7477, 7478, 7479 between the transfer case control module and the sensor.
Look for terminal tension, backed out terminals, corrosion, missing weather pack
connections, and wire crimping.
The majority of intermittent diagnostic trouble codes are caused by poor wiring connections.
Do not replace parts for an intermittent concern before checking all connections on the
appropriate circuits.
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