2002 GMC Sierra service 4 wheel drive light

You will need to have the 4wd system scanned.Find a shop with the proper software to do the scan.It may not be the switch, it could be any one of the several systems montored by the PCM regarding the 4wd system.A scan will reveal what codes the PCM has stored in regards to this system and we can go from there

[quote:096fc88e40="reborn2363"]Electrical problem
2002 GMC Sierra V8 Four Wheel Drive Automatic 203000 miles

my service 4 wheel drive light will not go off, I have installed two new switches ig goes off for a few hours then comes back on. when the light is off the 4 wheel drive works fine, when the light comes on the lights on my push button switch goes off & my temp & compass on my mirror quit working as well.
Please help me
Preacher Lloyd[/quote:096fc88e40]

I did not pay $10.00 tp be told to take it to the shop,

There isnt any way to access the information(codes) in the PCM/VCM without the proper scanning equipment.You could just throw parts at it and hope for the best, but thisis why they integrate on-board diagnostics into the systems.I have seen issues with the actuator motors on the transfer cases, but that would just be a guess.

I understand, I will fina a shop & get it checked, I am al little frustated. but thanks for all your help & I will take your advice & I will use this site again.
William Pate

I wish I could help with that one. They make it pretty rough on DIY people