What 15 owners told NHTSA about the 2020 Chevrolet Impala

The component is the Evaporative Emission Control System (EVAP) Vapor Canister Purge Valve.The internal diaphragm or solenoid of the factory-installed purge valve has worn out prematurely or became contaminated, locking it permanently into a stuck-open position.The Manifestation or (Symptoms): The stuck-open valve continuously drafts raw fuel vapor and unmetered air into the engine intake manifold. This causes an improper air-fuel mixture, resulting in:Stumbling / Failure to Start Immediately After Refueling (the engine is flooded by gas tank vapors forced in during fill-up).Rough Idling (due to a continuous vacuum leak).Illuminated Check Engine Light tracking Diagnostic Trouble Codes (DTCs) P0496 (High Purge Flow) or P0442. Yes, it is available for inspection. The vehicle stumbles, hesitates, and fails to restart at busy gas pumps and intersections which places drivers, passengers, and other motorists at an immediate risk of a collision. Yes, the problem has been validated by an professional auto mechanic shop. No, it has not been inspected by anyone else other than the mechanicshop to diagnose the problem, issue. The check engine light came on as I cranked the vehicle up and it started idling. No known symptoms until check engine came on prior to failing. The check engine light first appeared in May 2026 as well as the codes mentioned above.

NHTSA ODI 11744373

The contact's friend owned a 2020 Chevrolet Impala E. The contact stated that while her friend was driving at 25 MPH and approaching a curve, he inadvertently lost control of the vehicle.  As a result, the vehicle left the roadway, rolled, and came to a complete stop with all four wheels facing upwards after colliding with a tree. Though the vehicle rolled on its back no air bags were deployed. No warning lights were illuminated. The vehicle was towed to a tow yard but had yet to be deemed a total loss by the driver's insurance provider. A police report was filed and injuries were reported. The driver refused medical attention from EMS at the time of the accident but stated that he would seek medical evaluation at a later date as he had hit his head on the driver's side door window as a result of the accident, resulting in visible injuries. The manufacturer was not notified of the failure. The failure mileage was 85,000.

NHTSA ODI 11622548

I was in a car accident on June 20, 2023. I was stopped in traffic and was hit in the rear and pushed into the vehicle in front of me. The air bags detonated but did not deploy. The steering wheel and both front seat side air bags had some coming but the airbag did not deploy.

NHTSA ODI 11528914