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2500 suburban 4x4 goes into 4wd hi at 55 mph


toppjimmy

Question

Ok, I am a used car manager at a gmc store. I bought a 2003 suburban 2500 lifted. I noticed at about 45 mph it goes into 4wd hi. Iam

driving it now without the 4wd switch connected. And it doesnt go into 4wd at all. We have replaced transfer case, balanced drive shaft. And have no idea why it goes in 4wd high at 45 to 50 mph.

 

Can someone help me before i am broke, My service dept is very young and inexperienced and its easier to throw parts than diagnose. thanks for any help

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5 answers to this question

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Probably a computer. BCM maybe?

 

I want to say the switch does, but every manufacturer loves to throw a computer between the switch and the load for whatever reason these days.

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Probably a short that's activating the transfer case without the button being pushed.

 

Knowing the wiring on all the GM's I've seen from '96 on, I would bet on it. Talk about cheaping out ... :nonod:

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