One or both secondary air injection check valves may become restricted causing poor air flow resulting in illumination of the Check Engine Light. It is often recommend to replace both check valves even if a fault code is set for only one bank of cylinders. Replacing only one valve may result in a return trip to the repair shop.
Check Engine Light Due to Restricted Secondary Air Injection Check Valve on Chevrolet Silverado 2500 HD
Average mileage: 171,666 (146,000–196,000)
Exhaust & Emissions affected: Gasoline
11 people reported this problem
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The service engine soon light on blinking. I have had duals put on my truck, and I noticed that the missing is on the drivers side. I have had spark plug wires,spark plugs,injector cleaning and am still having the same problem. I continued to pay money to at LEAST diagnose the problem. Finally a mechanic told me it is a computer malfunction. To repair and fix the problem will be 900+ to replace the computer. WHEW
Code Definition: Evaporative Emission Vent Solenoid Control Circuit:Line:BWDItems:CP561,CPV16,CPV44