Trouble code

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03-16-2009, 10:52 AM

chubbyboy88

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Trouble code

I got the service engine code 0402 after I put in a new mass airflow sensor an reset it. I drove it today for a half an hour and the service engine light poped back on I pulled out my scanner and got that code.What does that code usually mean?

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03-16-2009, 11:08 AM

Purplehazeir

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See if this thread doesn't help you https://www.gmforum.com/t279443/

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03-16-2009, 11:09 AM

tlsheff

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DTC P0402 Exhaust Gas Recirculation Flow Excessive Detected

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03-16-2009, 01:54 PM

BillBoost37

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EGR flow is detected by the MAP sensor. However if it'* stuck open ...which it should also complain about that.

Excessive flow might be a vacuum leak as well.