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2004 Chevrolet Colorado Question: check engine light



cgirl487, 3.5L 5 Cylinder, Port Isabel, TX, January 03, 2010, 21:05

My check engine light comes on and stays on even when the truck is turned off. Overnight it drains my battery and i have to jump it to get it running. Any idea as to what is causing this?

3 Answers
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  • Answer #1

    January 03, 2010, 22:20

    It sounds like your Ignition switch is defective and not completely turning off.

    here is some info about the light when it is on while driving


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  • Medium-star Best Answer
    January 10, 2010, 03:32

    I had it happen in mine too because of the gas cap. To reset the check engine light, as soon as you turn the key,pump the brakes hard 3 times. That fixed mine. Though it always reappears.

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  • Answer #3

    Visitor, January 27, 2011, 05:05

    your alternator might be shorted out internally. try taking it out and having it tested. my truck had the same problems. i also had problems with power locks and windows when the battery went dead

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