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08 gmc sierra 1500 4x4 electrical issues


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I have a 2008 gmc sierra 5.3 4x4 and recently started experiencing cruise control failure. After changing my Brake light switch on the petal 2 times with no luck I gave up. About a week after the second brake light switch I started experiencing electrical issues else where. At random speeds my electric doors lock and unlock rapidly and my "service stabilitrak" light or "stabilitrak off" light come on and off in random sequence. During the electrical show my truck either down shifts or up shifts depending on the speed to about third gear, and the gear position light disappears. The light doesn't even come on for the cruise control anymore, and when returning to normal the speed odometer and rpm gage bounce. I tried changing my brake light switch again with no luck all OEM gmc switches. My TPS and gas petal, with computer reprograming, where changed at a dealer a couple months prior to the first issue. When I run diagnostics on it I get a lean exhaust code. I notice this happens more often in the morning time or when its raining. Like moisture may be the cause of the issue or it may be a coincidence. It might happen all day one day then might not happen at all for a week.

 

Any help is appreciated. The dealer I bought the truck from don't return my phone call to schedule appointment and the dealer closest to my house just wants to charge me a diagnostic fee and not offer a solution.

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Sounds like you answered your own question....Since it's happening in damp conditions, I would think you have an exposed wire or wires getting wet. You may want to go over the wiring and check it out.

 

 

Sent from my crappy iPhone 6

using Tapatalk

 

Yes but the problem is I don't know where to start. IS the a harness outside the cab that controls everything?

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On the interior, I would start under the dash on the driver side. Most of the wiring & fuse box is right above, and to the left of your lega while sitting in the driver seat.

 

 

Sent from my crappy iPhone 6

using Tapatalk

Where should I start on exterior ?

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How would he know ? , no Devine repair from the gods here , no one crystal ball works here either so idk what to tell you , it's the Internet , truck is NOT in my bay at present or his bay

 

Come on

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