Question about 2005 Pontiac Grand Prix

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Hello my car starts in runs fine but when im on the hwy driving the starter ignites like its trying to start while im driving the the car dealership ont know what the problem is ive changed ECM,PCM,Battery,Coils,Ignitions module,ignition,fueses,relays can anyone please help

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The CRANK RELAY primary wire (control circuit) is a YELLOW / BLACK wire and it goes to pin #23 in connector C1 at the PCM. If I were a betting man, I would say that the most likely cause of this problem is that the YELLOW/BLACK wire is shorting to ground. This will cause the start relay in the UNDERHOOD FUSE AND RELAY BOX to energize and make the starter engage. This wire runs from the PCM (Located inside the air cleaner assembly) to the START RELAY. (Located on the right stut tower in the UNDERHOOD FUSE AND RELAY BOX. Inspect the wiring harness all the way along this path. You will most likely find a place where the harness is rubbed through and there you will find the YELLOW/BLACK wire is most likely shorting to ground.

Posted on Apr 02, 2011

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  • dttech
    dttech Apr 02, 2011

    P.S. If you have an aftermarket remote start system in your vehicle the YELLOW?BLACK wire is most likely what the remote start system is tied into. In this case, I would remove the aftermarket equipment and repair the wire.

  • j_tremele80 Apr 02, 2011

    I think u may have solved my problem so is there any way i can contact you to let you know that this was helpful after checking.

  • dttech
    dttech Apr 02, 2011

    Sure you can just return to this page and leave a comment or you can post a "testimonial" I would like to know either way...(even if it doesn't fix it) We can look elsewhere for the problem.

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Have you changed the starter? MAby it gets stuck and catchs on the fly wheel do you hear any noses coming from the passenger side area while driving? like catching sound then u hear the starter ingnite? it could just be a bad starter tho try that

Posted on Apr 02, 2011

  • j_tremele80 Apr 02, 2011

    i changed the starter twice and it just keeps trying to start until it burns up

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