Question about 2003 GMC Sierra 2500HD

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I HAVE TWO PROBLEMS: THE CHECK ENGINE LIGHT COMES OCCASIONALLY WHEN I'M DRIVING AND SHUT TH ENGINE DOWN.I HAVE TO PULL OVER,TURN THE CAR OFF AND LET IT SET FOR A WHILE AND THEN IT WILL GO AGIAN. NO.2...I HAVE ANTI-FREEZE LEAK COMING FROM THE FRONT PASSENGER SIDE,AT THE VERY FRONT OF THE TRUCK..IT A GRADUAL LEAK THAT OCCUR WHEN THE VEHICLE SITS FOR WHILE..

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Take the truck to a mechanic or auto parts store and have the com[puter scanned for trouble codes. There is no way to tell what is causing the problem without the codes.

Posted on Dec 29, 2010

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The light you're referring to isn't a check engine light, the check engine light merely says "check engine" in orange and is on the lower right hand side of your instrument panel. It is reserved for telling you that something annoying is happening with your engine, but is usually related to a bad sensor reading in your emissions control system.

That other light, (the exclamation point in the red triangle, in the center of the instrument panel,) indicates that something very bad is happening with your engine, it only comes on if continued driving could severely damage the engine. I highly recommend against driving it at all, as doing so will probably just make your problems worse.

What's your temperature gauge reading? If it's going really high, or remaining pegged at the bottom, you may have some kind of coolant system issue, and the motor is shutting down due to an overheat. (Which can then result in a blown head gasket, which I have done...)

I have experienced this twice: once due to a coolant line blowing and overheating my engine, and once due to a major oil leak. (Oil running straight out of the bottom as soon as I put it in. Yikes!) Neither of these problems is something you want to drive your car with until you have discovered the source of, and rectified; the problem. Check all of your fluids and oil, watch all of your gauges, and see if anything out of the ordinary is going on.

If you can't see any obvious reason for this, take it in to the shop, because your car is trying to protect your engine, and getting an estimate is a lot cheaper than replacing your engine.

Good luck,

-R

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