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P Codes (powertrain)
P0400 - P0499
Diagnostic code P0411 clear code light came back.
2008 GMC ENVOY
Diagnostic code p0411 clear code light came back on what check valve is sticking and where it would be I have a 08 gmc envoy with 4.2l
have the same problem?
Friday, November 2nd, 2012 AT 11:43 PM
P0411 Secondary Air Injection System Incorrect Flow Detected
The check valve is in the air supply line to prevent exhaust gases from entering the air pump-
Friday, November 2nd, 2012 AT 11:55 PM
to post a reply.
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