Question about GMC Sonoma

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I just got a new switch for my 4 wheel drive and it will light up for a second and switch to 4 wheel then go right back to 2 wheel

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  • wyniguez Dec 12, 2008

    no. it actually isn't even lighting up anymore. that just happened the first time i installed the new piece

  • wyniguez Dec 14, 2008

    i did the first time i tried to put in 4 - wheel but can't hear now

  • wyniguez Dec 16, 2008

    Thank you very much. I'll have to try that

  • mikehumble May 11, 2010

    Can you hear the transfer case motor shift?

  • mikehumble May 11, 2010

    Will it shift into 4lo?



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First check your fuses there is a ATC fuse and 4wd fuse. If they are both good try resetting the 4wd computer. To reset pull out both the ATC and courtesy lamp fuses for at least one minute then reinstall both fuses then cycle the key on and off 5 times. 1 cycle = key on and off.

Posted on Dec 15, 2008

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    DONALD Sep 23, 2014


    DONALD Sep 23, 2014


    DONALD Sep 23, 2014


  • mikehumble Sep 23, 2014

    The ATC fuse is automatic transfer case. Your truck has a fuse box under the hood and one on the side of the dash. The atc fuse is in one and the courtesy lamp fuse should be in the other. I dont remember which is which.



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SOURCE: lights on push button 4 wheel drive out

more than likely there is a code set for the 4 wheel drive system and its stuck in a "limp in" mode. you're going to need to get your hands on a code reader or take it in to the dealer for a diagnosis.

Posted on Jun 25, 2009

  • 400 Answers


The blinking is telling you there is a problem in the system. There isn't much to the system, so if you can get the codes out of if then report back and we can lead you in the right direction.
We'll need the code, Otherwise you'll just be throughing expecive parts at your truck.

Posted on Oct 18, 2009

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