Question about 2005 GMC Sierra 2500HD 4WD

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GMC Sierra "Service 4WD" message

I was wondering if it is safe to drive my 2005 GMC sierra when I had the "service 4wd" light come on earlier today. I was getting ready to leave on a road trip (500 miles to my destination) and the "service 4WD message apperared. My truck was stuck in 4L (I did not puit in 4L), but i then could not get it out of 4L until I turned the truck off and then on again. It seems to be fine, but it is Sunday and the service dept at the dealership is closed. I would like to leave tonught if there will be no harm to the truck.

Thanks!!!!

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  • rhaugenjr Jun 15, 2009

    I have read some other posts on this issue. Is this a common problem, and what are the chances of a major problem on this trip?

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You should be fine to drive it home, as long as you don't drive it like that all year. There are a few things that activate the 4WD and one of the components has a failure and needs to be addressed. Good luck and hope this helps.

Posted on Jun 15, 2009

  • Harvey N Tawatao
    Harvey N Tawatao Jun 15, 2009

    No major problem, I had problems on my jimmy. The front differential hub was locked in the 4WD and i drove it like that for a long time, I didn't know it was like that till i serviced the transmission and found the vacuum switch on top of the transfer case was seized in the 4WD position. The other common problem is the electronic 4WD actuator to the transfer case may have gone bad or the wire harness gotten unclipped. Check the fuse panel and look for any fuses that need to be replaced like the 4WD fuse. Good luck and be safe.

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