2004 GMC Sierra 2500 HD Q&A
2004 GMC Sierra 2500 HD Question: service light
The service 4wd light is like a "check engine" light for your 4wd system. When the light comes on a fault code will be set in the transfer case control module. This fault code can be read with a scan tool. The stored codes should help isolate the portion of the 4wd system that is causing the fault. - Russ
We just added this article last week, hopefully it will help you with your 4wd issue: http://repairpal.com/gm-4wd-warning-light-issues - Oakman
I had the same issue. There is a sensor located on the front diff. I disconnected and cleaned the connection. Quick fix... - Visitor
and the truck goes into neutral and i have to shut the truck off in order for the truck to go into gear, sometimes in goes into first gear and i have to shut it off again and the engine light goes off
The 4WD transfer case encoder motor position sensor or the selector switch may fail causing the service 4WD message to be displayed. Fault code(s) stored in the transfer case control module will ...
A couple of weeks ago my 2004 GMC 2500hd started misfireing while driving. I took it to a GMC service center & they don't know whats going on with it. They have never seen this type of issue. It pr...
Just bought this truck only thing the computer said was " service brake booster". Ok went on a 300mile trip about half way I was stuck behind a car going 65mph went to pass and the truck made a noi...
Service Brake System (and ABS and Brake) warning lights sometime come on when starting vehicle. This has happened for several years but only occasionally. Now it is happening more often (several ...