Check Engine Light On problems of the 2012 Chevrolet Impala

The contact owns a 2012 Chevrolet Impala. The contact stated while driving at 15 mph, the vehicle stalled causing the steering to lock and the brakes to fail. As a result, the vehicle crashed into street sign causing the vehicle to fall into a ditch. The contact stated the abs and check engine warning light was illuminated. The air bags failed to deploy. A police report was filed. There were no injuries sustained. The vehicle was not drivable and was towed to an impound lot. The vehicle was not diagnosed or repaired as of yet. A dealer was not contacted. The manufacturer had not been informed of failure. The failure mileage was 176,000.

1st - 8/11/2018 - 79,653 miles - check engine light came on, code p0411 secondary air injection system incorrect flow detected. Dealership stated the solenoid malfunction check engine came back on, code p0411, Chevrolet stated the secondary air injection system is functioning as designed and reset the code. Chevy's stated the faulty sir injection solenoids bank 1 and 2 was the cause of the check engine light code p0411. Advised me that the battery terminal may be the issue and recommended changing it. Recommend a new alternator. Chevy was unable to verify the code p0411 but made a recommendation for the issue. Check engine light came back on again, no other issues with the vehicle at that time. Gm opened a tac case. Advised by tac that carbon buildup in the cylinder valves from the cylinder heads was the cause. Told to drive vehicle for a few days. Within 3 days check engine light came back on. Chevy installed a vehicle data recorder per the gm field service engineer. Test results showed both air injection cut of valves needed to be replaced. Future also updated ecm calibration and programmed it - covered under warranty. 6th visit on 9/3/2019 at 85970 miles Chevrolet advised the cause is due to the left temperature control and air inlet actuators. 7th - 9th time, advised by independent auto repair shop, that everything was working as normal. Check engine light code was reset. Advised car needs to be calibrated at gm-approved dealership. As of today, the check engine light remains on. The final shop advised the issue may be that the system was not calibrated or just needed to be calibrated every time the check engine light came on. I believe that thousands of gm customers are paying out of pocket for unnecessary p0411 repair work.