MY Service 4WD light came on. Replaced the switch - no change. Had the dealer run a diagnostic. Possible T.C. speed sensor, possible module, possible transfer case clutch pack. Any suggestions? The module is $171 on GMpartsdirect.com. The dealer quoted $1800 for a new transfer case!!! HELP!!!

The dealer also quoted $300 for the module statinf it needs to be programmed. Can I replace it?? Does it really need to be programmed?

MY Service 4WD light came on. Replaced the switch - no change. Had the dealer run a diagnostic. Possible T.C. speed sensor, possible module, possible transfer case clutch pack. Any suggestions? The module is $171 on GMpartsdirect.com. The dealer quoted $1800 for a new transfer case!!! HELP!!!
does the 4x4 work? if it does ignore the light it.

No the 4WD does not work. and I need it to work.

No the 4WD does not work. and I need it to work.
On a vehicle that old replace transfer case total r/r.....Or buy another 4x4. If you are the original owner and replaced transfer case tracII fluid every 30,000mi I might consider taking the chance of changing componets. if you go this route I bet dealer will not warrantee this to work, more than a few months. must remove transfer case and inspect internals to determine if totally trashed................