Question about GMC Sierra 1500

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00 sierra the service 4wheel drive light is on. Had to replace the transfer case. I replace the switch in the dash with a new one. The 4 wheel drive *** on by it's self when u drive the truck. the only way that i can get it out is to stop for 20 mins and then restart the truck. what can be the problem?

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The Service 4wd indicator illuminates when there is a problem with the 4wd system (its the "check engine light" for your 4wd system).

There will be a diagnostic trouble code stored; most likely scenerio... the module is bad (thats the switch on the dash) but have it diagnosed before throwing a part at it

Also, I post one quote from other users:
After reading this and other forums on this subject, I too have experienced the problem with my 2001 Silverado Z71 truck. It's symtoms included the switch 2WD indicator going off and on periodicly and the "Service 4WD" light coming on and going off periodicly. If I tapped real hard on the dash area around the switch, this would cause the switch indicators to go off and on as well. When I first purchased the truck, some 60,000 miles ago, all switch indicators would flash on each time when the ignition switch was turned on, then the selected drive indicator would remain on. Ever since the truck turned 45,000 miles my problems began. I went to the Chevrolet Dealer and asked if there was any TSB's on this problem and they said they recognize there is a problem but there are no recalls. Most forums I have read to date point to a defective "Transfer Case Control Switch". This has been a nuisance to me more than anything else see this light popping on and off all the time. So I finally broke down and went to the dealer to get a new switch that they now use in place of the ones with this problem. It took 20 minutes to install. All the normal indications returned and so far,the truck is back to the way it is suppose to be. The switch costs $60 with tax at the dealer. Make sure you have your VIN ready when you talk to the parts desk.

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Posted on Aug 26, 2010


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