Mechanics

GMC ENVOY AIR PUMP PROBLEM

2008 GMC Envoy • 46,000 miles

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
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novatech66
November 2, 2012.




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-

Tiny
Rasmataz
Nov 2, 2012.


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