2008 Gmc Envoy Diagnostic Code P0411 Clear Light Came Back On Check Valve

2008 GMC ENVOY
46,000 MILES
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NOVATECH66
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  • 1 POST
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
Nov 2, 2012 at 11:43 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
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-
Nov 2, 2012 at 11:55 PM
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