Check Engine Light and Code P1416: GMC Sonoma Muffler & Exhaust

Problem overview

The 1998-2002 GMC Sonoma has a known issue with the air pump check valve which causes illumination of the check engine light. There are no notable symptoms, but the vehicle will not pass state inspection or smog testing.

When the valve fails, it sticks closed, and the computer sets the code P1416. Replacement of the check valve is the only fix, as the valve is not serviceable.

This page can provide more information about the air pump check valve.

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5 model years affected

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Check Engine Light and Code P1416 on GMC Sonoma

Problem overview

GMC Sonoma vehicles with this problem

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