NHTSA ID Number: 10113854
Manufacturer Communication Number: PIP5369B
This Preliminary Information communication provides information to the technician about vehicles that have “Service 4 Wheel Drive” message on the Driver Information Center. Provides the technician with additional information to ensure that the TCCM contains the latest software released to address previous issues, also advises of default action changes. Calls out specific circuits to be inspected to help isolate intermittent codes.
27 Affected Products
|Subject:||Service 4wd Message C0398|
|Models:||2014-2016 Chevrolet Silverado|
|2015-2016 Chevrolet Suburban Tahoe|
|2014-2016 GMC Sierra|
|2015-2016 GMC Yukon|
|2015-2016 Cadillac Escalade|
|2015-2016 GMC Canyon|
|2016 Chevrolet Colorado|
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. Those diagnostic trouble codes may be intermittent and move to history but once a C0398 is set it can only be cleared with a scan tool and will never move to history on its own or clear by key cycles, At this time you need to clear the DTC 2 times to clear the code from the TCCM.
Since C0398 sets when IPS and RPS differ by more than a predetermined amount, terminal or circuit issues can lead to a position sensor reading that is incorrect yet not be out of range far enough to set a code against the related sensor (IPS or RPS). That is why it is beneficial to record any codes set with C0398. If the condition cannot be reproduced and there was a code C0396 also stored but will not reset then there is a high probability of having an issue with the IPS related circuits.
FOR 2014 Model year Silverado and Sierra or 2015 Model year Pick up, utilities and Canyon equipped with NQH, NP0 or NQ6 vehicles setting a C0398 (no other codes C0392/C0396/C0326) ensure that Service Update 15304 has been completed, indicating the vehicle has the latest transfer case control module software/calibration.
For vehicles that already have previously completed 15304 check circuits related to IPS/RPS for chaffed wires or poor terminal tension. Note there are 2 different terminals used in the transfer case control module connector which also have a different tension. However the terminal test tool should be retained in either terminal.
For vehicles that do not have 15304 completed, perform 15304 and after programming perform the set up procedure in Tis 2 Web then check circuits related to IPS/RPS for chaffed wires or poor terminal tension. Note there are 2 different terminals used in the transfer case control module connector which also have a different tension. However the terminal test tool should be retained in either terminal.
FOR 2014 Model year Silverado and Sierra or 2015 Model year Pick up, utilities and Canyon equipped with NQH, NP0 or NQ6 setting a C0398 with codes C0392 or C0396 perform published diagnostics for the other codes and repair as needed. If diagnostics do not lead to a repair then check circuits related to IPS/RPS for chaffed wires or poor terminal tension. If 15304 has not been performed, diagnose and repair the C0392/C0396 first then perform 15304 before returning the vehicle to the customer. Note there are 2 different terminals used in the transfer case control module connector which also have a different tension. However the terminal test tool should be retained in either terminal.
Note: The latest version of software/calibration contained in 15304 and start of production 2016 model year vehicles eliminated the possibility of the transfer case control module setting C0398 on cold start when the vehicle was shut off in auto 4 wheel drive due to a mechanical anomaly in the actuator motor. Previous to this software release actuator motors part number 23355888 may have been installed, however in 2015, as an interim fix, the actuator motor was changed in production to a production equivalent of 23355888. The latest version of software/calibration has provisions to identify this anomaly and it is no longer necessary to replace actuator motors. If the vehicle sets C0398 on start up in auto 4 wheel drive then again check circuits related to IPS/RPS for chaffed wires or poor terminal tension.
FOR 2015 Model year Pick up, utilities and Canyon equipped with NQH, NP0 or NQ6 Built after 05/26/2015 and all 2016 Model year Pick up, utilities Colorado and Canyon equipped with NQH, NP0 or NQ6 setting a C0398 with no other diagnostic trouble codes such as 0392/0396, verify the latest transfer case control module software as compared to what is currently in the TCCM and what is available through Tis2Web. It is very important to follow the strategy below to accurately diagnose and repair these vehicles.
1: Contact the customer and determine if the vehicle was driven an extended period (longer than 1.5 hours) in Auto 4 wheel drive when the message came on or just prior to the message coming on.
If the customer indicates that the message came on while on an extended drive cycle in auto 4 wheel drive or was on at start up following an extended drive cycle in auto 4 wheel drive look at the tag on the actuator motor. If the part number in the lower right corner is M0033357 (1) then replace the actuator motor. If the part number is M0040350 (2) then look at the number in the upper right corner of the tag (3), If the first 6 digits (left to right) of the number in the upper right hand corner are higher than 150523 then replace the actuator motor. (These are NOT G.M. part numbers refer to the parts catalog for current replacement parts)
For actuator motors with any other numbers in the lower right corner (1 or 2) or vehicles that have not been driven for extended periods (less than 1.5 hours) in auto 4 wheel drive look at transfer case control module data in GDS2. Select the following parameters to be locked at the top of the screen. 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, Transfer Case Range Position Sensor, and Engine Run Time. The table below contains the parameter names from the Transfer Case Control Module in GDS and is NOT an exact representation of the GDS screen or format.
|Parameter Name||Control Module||Value||Unit|
|Range Actuator Position Sensor||Transfer Case||36.4||*|
|Variation Between Transfer Case Range Position Sensor and Range Actuator Position Sensor||Transfer Case||0||*|
|Variation Allowed Between Transfer Case Range Position Sensor and Range Actuator Position Sensor||Transfer Case||7||*|
|Transfer Case Range Position Sensor||Transfer Case||36.4||*|
|Engine Run Time||Transfer Case||0.002395833|
Monitor Range Actuator Position Sensor (IPS), Transfer Case Range Position Sensor (RPS), Variation Between Transfer Case Range Position Sensor and Range Actuator Position Sensor and wiggle the harness while watching the data. If data indicates a sensor or variation changing over 1.5* perform circuit testing related to the suspect sensor. It is normal to see 0-.3 degrees variation while driving in auto 4 wheel drive
For vehicles repaired under warranty use:
|Labor Operation||Description||Labor Time|
|8420110||Full size truck Transfer Case Two/Four Wheel Drive Actuator Replacement||Use Published Time|
|8420120||Mid-size truck Transfer Case Two/Four Wheel Drive Actuator Replacement||Use Published Time|
Bulletin No.: PIP5369B
Published date: 04/3/2017
To obtain the latest electronic controller calibration information for your vehicle, go to https://tis2web.service.gm.com/tis2web and enter the vehicle’s 17 character Vehicle Identification Number (VIN) and select ‘Get CAL ID’.
You can then compare the latest part number with the actual number installed on the vehicle to determine if a reprogram is needed.
The Service Programming System (SPS) application is part of the TIS2Web system. To program an ECU, the SPS application must communicate with the vehicle control modules using the proper J2534 programming interface tool.
The following are the supported interface tools:
The Tech 2 supports model years 1996 and beyond. With the addition of the CAN Diagnostic Interface (CANdi) module, Tech 2 is fully backward compatible with current Tech 2 functionality and operates transparently when diagnosing non-CAN-equipped vehicles.
The GM MDI is the Global Diagnostic tool for future vehicles starting with Global A vehicles. The GM MDI was introduced in the fall of 2007 for Pass-Thru programming and offers faster programming speed. It can be used to perform Pass-Thru programming on all vehicles built since 1996 and into the future. Click here to view a list of GDS supported vehicles.
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Last update on 2021-05-11 / Affiliate links / Images from Amazon Product Advertising API
Last update on 2021-05-11 / Affiliate links / Images from Amazon Product Advertising API