2008 GMC Envoy Repair Question
Asked on November 2, 2012
GMC Envoy Air pump Problem
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
Asked by novatech66Answer
Replied on 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-
