Question about 1999 GMC Sierra

2 Answers

My serice engine light came on. what can the problem be?

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  • Keith Heavilin
    Keith Heavilin May 11, 2010

    Take your car to your local auto parts store and have the code check. Once you have the code we can help you much better.

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2 Answers

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  • GMC Master
  • 3,854 Answers

There are to many things that can cause this, if there is no change in performance to engine and transmission. Good thing that is may be a O2 sensor or a EVAP problem and may just be time for a new gas cap. You can go to Auto Zone and have the truck scanned since it's free of charge to scan there. If you like and to clear the service engine light for now, place the ignition key's to the run position and pull the ECM (BATT) fuse out for 30 seconds and place it back in. Start the truck and it may stall, just let it and don't touch anything. The ECM is relearning the engine and transmission, start it again and let idle for 1min and then go for a test drive. If the service light comes back on then it's a new code and you know that when you get the truck scanned, it's new codes. Good luck and keep me posted, be glad to help.

Posted on Jun 27, 2009

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  • Master
  • 855 Answers

You need to take your truck to a shop and have it checked. The service light can mean anything from a simple bad connection to any part or combination of parts involving computer, engine controls and or emmission controls. Unless you are very knowledgable in these areas go to a repair shop mistakes in repairing these items can cause damage and or be very expensive.

Posted on Jun 27, 2009

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