2004 Chevrolet Colorado Q&A
2004 Chevrolet Colorado Question: check engine light
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 - dandd
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. - colorado wrona
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 - Visitor
Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
My check engine light will go out when I fill the gas tank. fill it drive about a mile and restart engine light out...
The engine may develop a misfire due to worn valve seats. This fault will cause the Check Engine Light to illuminate. Replacement of the cylinder head may be required to correct this concern.
I continuously have the check engine light come on. when i check the code it just says cylinder 3 misfire. I can go to the parts store an...