Question about 2006 GMC Envoy Denali

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Code P0121 on 2006 GMC Envoy Denali Check eng. light on. Is starting to cut off when at stop idling. Checked wires to the TPS and look fine. Thinking about cleaning Throttle body next. Need advice.

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Classic signs of idle air control not able to cope with sudden engine loads. Cleaning should resolve this. Remove ducting from air cleaner to throttle entrance. Spray with carb. choke cleaner or WD40 spray and wipe back to the alloy finish. clean the the throttle plate and push the throttle open with your fingers and clean in behind as best you can. Clean the passageways to the idle air control valve. Remove the valve and give it a thorough clean up. Reassemble and it should all be good.

Posted on Nov 11, 2010

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SOURCE: Code P0121 on 2006 GMC Envoy Denali Check eng.

Cleaning the throttle body is certainly the right thing to try first. Make sure you clean the throttle plate as well.

Posted on Nov 29, 2010

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