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2008 GMC Envoy Repair Question


Topics covered: Air pump, Exhaust, Gas.
Mileage: 46,000 miles.

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
Avatar Asked by novatech66

Answer

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-

Tiny Answered by rasmataz
68 questions asked