Question about Chevrolet Silverado 1500

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"Service engine soon" on highway

"Service engine soon" light will come on after about 10 minutes of highway driving. There is no noticeable difference. But if I shut the truck off and turn it back on, the light wont come on for another 10 minutes.

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  • Sledneck26 Jul 12, 2009

    also i did a code scan a while back and i got nothing. but i did unplug my egr valve because it was malfunctioning, well actually a mechanic did that.

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This is a hard code meaning there is something wrong scanning the PCM is your only real option.

Posted on Jul 12, 2009

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