Question about 1999 GMC Jimmy

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GMC Jimmy 1999

The 'Check Engine' light stays on after the engine has started, but everything is running smoothly. The truck seemed to be a tad lazier on cold starts, but I didn't take notice until today, when the Check Engine light stayed on. I suspect a spark plug (even though I cannot say by listening to the engine, it's a V6) Any ideas please ? I have the same problem... I changed the battery on my 1999 GMC Jimmy and the service engine light came on and stayed on. Does anyone know how to reset the light? I have already tried disconnecting the battery cables for 10 minutes and then re connecting them. No change.

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Disconnect the negative cable but leave the positive cable on
if this does not work then it will have to be scanned

Posted on Nov 11, 2008

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