Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Hello, There is no actual reset procedure, I guess that is why you can't find it in the owners manual The actual reprograming on the unit is done with a class 2 scanner. The only thing you can try at home to reset the module is by removing the fuse under the hood. Look for a fuse labeled ATCM or TREC or TCCM. Once you have removed the fuse, wait 10 seconds and re install it. If this clears your condition, great. But, I have not seen it work very often. The correct way is to connect a class 2 scanner to the system and read any stored codes in the system and repair as needed. The codes will point you to the failed sensor or component. A regular code reader can't do this job as all they can read are codes related to the engine, emissions and transmission. This module is a class 2 electronic device so a class 2 scanner is the only thing that will interface with it. And the scanner is what is used to reprogram it. Below is another procedure that you may want to try and below that is what the factory says about it going to sleep. I hope some of this helps you. Thanks
The software in the transfer case control module has a "shift abuse lock out" mode to protect the module and encoder motor. This concern will occur if the module senses repeated shift request in a short period of time. If the driver continuously tries to shift in and out of different modes, the transfer case control module will stop trying to shift for several seconds to prevent abuse damage to occur. Cycling the ignition off for 30 seconds or more should allow the transfer case to resume normal operation.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
This bulletin is being revised to add Subject information and change the labor operation. This bulletin cancels and supersedes Bulletin Number 03-04-21-006. Please discard Corporate Bulletin Numbers 02-04-21-006D and 03-04-21-006 (Section 04 -- Driveline/Axle).
Some customers may comment that the 4WD/AWD indicator lights on the selector switch do not work, or the 4WD/AWD system may be inoperative and/or the service 4WD light is illuminated. The condition is typically intermittent and always occurs at key-up. Upon investigation, the technician may find DTC C0550 set.
The Transfer Case Control Module (TCCM) has not received the wake-up call during key-up and has remained in the "sleep mode".
When the TCCM is in the "sleep mode", it will not communicate with the class II bus or the Tech 2®.
Important: For the 2002 model year, the TCCM must be replaced and reprogrammed.
For vehicles repaired under warranty, use:
Transfer Case Module - Reprogram with SPS
© Copyright General Motors Corporation. All Rights Reserved.