Transfer Case problem

DKHEESCH

MEMBER
GMC C2500

I have a 2001 GMC 2500 with the 6.0 motor, Auto Transmission and push button 4wd. The truck has about 75000 miles on it. That is the problem the 4wd, The Service 4wd light came on and this disabled my 4wd completely. If I shut the truck off and restart it again I can usually get in four wheel drive again. Previousely it had stuck in 4low once and after disconnecting the battery and reconnecting it, the system started working again. I have not put it in 4low since, just in case. I have been told a common cause is the transfer case servo motor. How many hours of labor and about what is the cost of a part like that? Also what would be the easiest way of testing that motor without tearing apart the T case? Thankyou

Monday, September 17th, 2007 AT 7:05 PM

3 Replies

BMRFIXIT

MECHANIC
19,053 POSTS

Motor is most common on these trucks it's on the side of trans case.

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Monday, September 17th, 2007 AT 7:44 PM

MR62BUICK

MEMBER
2 POSTS

I am having the same issue. The transfer case servo is mounted on the drivers side of the transfer case. You pull the driveline, and unbolt the 3 bolts from the case, unplug the unit, then reinstall. I guess there is giude pins with a new unit, but they do not come with it so save the old ones. I was told the selector switch on the dash was the problem, but that didn't fix it.

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Thursday, November 18th, 2010 AT 2:41 AM

KEN L

MASTER CERTIFIED MECHANIC
51,685 POSTS

I would check the fuses, there are three fuses that run the system, turn the key on when checking fuse, here is a guide to help and the transfer case wiring diagrams so you can see how the system works and which fuses to check.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

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