Transfer Case Not Shifting

pottercon · February 25, 2008

I have 2002 silverado 1500. The service 4 wheel drive light is on. It is stuck in 2 wheel drive, will not shift. None of the dash button lights are illuminated. I replaced the encoder motor, and replaced the dash switches, neither fixed the problem. what else could be the problem.

pottercon · February 26, 2008

the problem is you did't get it diag'd ,needs to be scanned

ok got it scanned today and the code is dtc co327

gmtech4 · February 26, 2008

the fix for that according to the bulletin is to replace the encoder motor sensor in the encoder motor assembly and reprogram the TCCM.seems you may have a different concern ,cannot diag over the internet electrical problems ,take it somewhere to have it diag'd,good luck ,keep us posted

pottercon · February 26, 2008

the fix for that according to the bulletin is to replace the encoder motor sensor in the encoder motor assembly and reprogram the TCCM.seems you may have a different concern ,cannot diag over the internet electrical problems ,take it somewhere to have it diag'd,good luck ,keep us posted

well i took it to a Chevy dealership she hooked it up and scanned it and tried to clear the code and it came back up. if i replaced the whole encoder motor, then it had a new sensor on it ,right? They couldn't tell me any more without running tests and checking all the wires. Would it help to try another known good control module.