Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Bulletin No.: 05-04-21-002
Date: March 10, 2005
with New Venture Gear (NVG) Transfer Case (RPOs NP1, NP4, NP8)
Dealers are replacing the TCCM unnecessarily.
Dealers are replacing the TCCM with codes stored in HISTORY only. The TCCM does not have a current fault condition when tested.
Parts reviewed at the Warranty Parts Center (WPC) have a 75% No Trouble Found (NTF) rate. The only two legitimate reasons to replace the TCCM are:
This DTC indicates that the module has an internal fault and should be replaced.
Pay particular attention to the terminal connections at the module. Spread or open terminal connections may create an intermittent contact. Do a pin drag test. Refer to the terminal testing information in the table shown.
Dealers who unnecessarily replace the TCCM that are found to have No Trouble Found (NTF) at the WPC will be returned to the AVM (Area Service Manager), or the DSM (District Service Manager) in Canada, through the Regional Feedback Process and may be charged back for the repair through the WINS system.
What this means is usually there is a fualt with the wiring or connections to and from transfer case. And you have fuses that could have blown
INSTALL OR CONNECT
When that happened t me in my 4x4 it was just a vacum hose that came off. It was mounted by the front cross memeber. I am not sure if your electonic system involves vacum but you may want to try. There is an actuator switch down there also that could be the root cause. It going into low gear is different that shifting intoXXXXX