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 1500 HD
Average mileage: 80,000 (80,000–80,000)
Exhaust & Emissions affected: Gasoline
8 people reported this problem
0 people shared problem details
Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
A poor electrical ground under the battery tray may cause the ABS warning light to illuminate....
A loose or worn gas cap could be cause the Check Engine Light to illuminate.
Truck started about 2 months ago losing acceleration while driving. You have to pull off road,...