Question about 2004 GMC Sierra 1500 Crew Cab

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My engine light has come on in my 2004 GMC crew cab 1500. are there some things I can replace or check without taking it to a mechanic shop (80,000 miles)

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If the light was flashing when it came on, then it means your engine is misfiring.

A solid light can mean anything from a loose/faulty gas cap to a transmission issue.

This light comes on when the computer detects a fault of some sort in its diagnostic tests. If it keeps detecting this issue, the light will remain on. If the light turns off, then it has detected that the issue may no longer be present.

In order to find out what the exact reason was for your light, You need to have your car computer scanned to retrieve the code that the computer would have stored when the light triggered. Most garages will do this free of charge. The code will tell you what may have caused the light to initially turn on. Until you get this code, it's impossible to determine what parts need to be checked or replaced.

Posted on Oct 07, 2009

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