2004 Chevrolet Colorado Q&A

2004 Chevrolet Colorado Question: check engine light

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? -
Answer 1
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 http://repairpal.com/check-engine-light -
Answer 2
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. -
Answer 3
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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