Question about 2002 GMC Sierra

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Service four wheel drive

2002 GMC SIERRA Service four wheel drive light came on now my push button switchs don't work and im stuck in 2wd. The truck was in four wheel drive and parked when i started it again the light came on. I had a mechanic check the code and it came up to a computer error. I disconnected the battery so the light would go out and took the switch out and sprayed it down with electric parts cleaner but it still wont' work. So now im not sure if its the switch or the acctuator on the transfer case or the sensor on the front dif.

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Without further diagnostics, it could be any # of causes, but these are notorious for bad conections at the transfer case encoder motor and /or the encoder motor itself.The motor,when replaced may need to be reprogramed.Be sure the switch and wiring are functioning properly as the encoder and/or related control module are pricy$$

Posted on Jan 10, 2009

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