Check Engine Light/Rough Idle Due to Stuck Open EGR Valve on GMC Safari

The EGR valve may stick open causing a rough idle and the Check Engine Light light to illuminate. Our technicians tell us that a piece of carbon may become stuck in the valve causing this problem. Cleaning the valve will usually correct this condition, in some rare cases the valve will need to be replaced.

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Average mileage: 161,159 (145,000–177,319)
2 model years affected: 1995, 2000
3 people reported this problem
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2000 GMC Safari 177,319 mi,
Code p1404