Question about 2006 GMC Sierra

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2006 gmc sierra

Transmission wont shift into 2nd was spitting 10 different codes. went to dealer, was told needed new computer. they installed new computer did not help. i believe it is a wiring problem. i also installed all new solenoids in valve body, still not working. went to transmission shop could not find problem help!!!

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  • Ed Woods
    Ed Woods May 11, 2010

    try having dealer update pcm. Does i have any codes coming up now?

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Sounds stupid, but try replacing the ingition seitvk, I had same problem with my 97 Jimmy, did everything you did befor replacing the ignition harness. bad wires in ignition switch sends low voltage to trans harness

Posted on Sep 07, 2008

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