Question about 1999 GMC Suburban

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Hi all. I have a '99 GMC Suburban that is having startup and electrical problems. This truck has a history of inadvertent starting probs. When it starts it runs perfectly; no hesitation, no backfires, no stalls. Once in awhile though, it would start then immediately stall. At those times it would take many tries and sometimes some wait time until it started finally. Last week it stopped starting altogether. No cranking at all and very little electricity to the truck. Replaced the battery and cleaned the VERY corrode cables. Removed and checked the starter. It passed. Now I have good power to the truck. Dash lights work. Headlights work. Wipers work. Brake lights work. But no ignition, no sound from fuel pump, no turn signals, no reverse lights. I checked all the fuses in both boxes and all look good. Don't know how to check the module thingies in the under-hood fuse box. I thought maybe a bad ignition switch so I replaced that and I think I put everything back the way I found it. Any ideas? Thanks. B

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  • ButchDawg Aug 24, 2010

    Will that also effect the turn signals and backup lights or is that a separate problem.
    I tried the fuse that is for both. it is good but I put a new one in anyway with no luck.

    What does a PCM typically cost?
    How much to reset it?

    Thanks
    B

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Hi! Looks pretty much a PCM (powertrain control module) failure. The PCM is like a car's brain that when it fails everything else's fail. As a first course of action I strongly suggest that you have the PCM resetted on the dealership but if ever that the PCM is faulty this will require replacement. Hope this helps and thank you for using FixYa!

Posted on Aug 24, 2010

  • dj_relly999
    dj_relly999 Aug 24, 2010

    PCM will cost you $300 atleast and the PCM reprogram or reset will be atleast $40.

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