Problem Description and Possible Solution
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.
Average mileage: 130,438 (26,000–282,700)
Exhaust & Emissions affected: Gasoline
37 people reported this problem
vehicle has a miss in the engine, when it rain the miss in the engine get worse,when riding about 70mph the engine jerks,at stop lights the vehicle surge forward.
check engine light - digital trouble code P0449 says a malfunction of vent solonoid valve and my on board dash says i have a loose gas cap - has this been a common problem? this vehicle has 56,000 miles
Check eng light came on and can't get it to go off on 2005 Chevy Silverado 1500. Have replaced gas cap, canister and Holes Lines, filters,
Service engine soon light went on. Took it to Pep Boys. Diagnosed that both air injection valves were bad. Being the start of the Labor Day weekend I opted to get it fixed and not wait. They charged me $121.17 a piece for the two valves. Was running fine before, and running fine now but without the check light on. If I had known that I could have waited and driven my truck without causing damage I would have put off the repair and shopped for a better, much better price on the parts. The problem did not effect the driveability of the truck, but at this age and milage I kind of get spooked about letting anything go for any time. Last month I ignored the check light for a week waiting for a better day, and the fuel pump gave out at an intersection. Argh!