466 of the
15,232 complaints filed about the Chevrolet Impala
are about the fuel system —
3% of everything owners reported.
The worst model year for it is 2000.
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 complaint #11744373 — an unverified report by a vehicle owner.
The contact owns a 2018 Chevrolet Impala. The contact stated that while the A/C was activated during the summer of 2025, the A/C failed to function as intended. The contact stated that hot air was blowing through the vents. No warning lights were illuminated. The vehicle was taken to an independent mechanic, who diagnosed the vehicle with an EVAP leak. The leak was found on a corner near the evaporative canister. The vehicle was not repaired. The vehicle was then taken to the dealer, where the EVAP leak was confirmed. The vehicle was not repaired due to the cost. The vehicle was taken to a specialty shop for the repair. The manufacturer was made aware of the failure and offered to pay a nominal part of the repair. The contact declined the assistance. The failure mileage was approximately 60,000.
NHTSA complaint #11727989 — an unverified report by a vehicle owner.
Jerking while picking up speed, key fob keep saying not detected, Radio feature work but stuck to basic screen I guess electrical problem Brakes is very rough not sure
NHTSA complaint #11712578 — an unverified report by a vehicle owner.
Fuel system or backfire is what I believe happened to it. The vehicle is available for inspection upon request. My safety was severely put at risk because the car exploded and caught fire while I was inside the car and fire came through the dash and air conditioner slots, anything could of happened whether shrapnel or burn. this also put others at risk if my spouse was in the car with me or the apartment complex I live in could have caught fire and endangered multiple people. No the issue has not been seen or confirmed by a dealer or service center. Yes the vehicle has been inspected by state fire marshal. No there was no warning lights or problems at all. We drove the car the night before, everything was normal and nothing was showing on the dash and the next day I jumped in, put my seat belt on and started the car to make sure it was running good and it exploded and caught flames.
NHTSA complaint #11708557 — an unverified report by a vehicle owner.
I was driving down the highway in anchorage ak I heard a loud bang like a gunshot , when the vehicle was inspected I was told basically Evap, fuel system , fans , electrical , Cadillac converter exploded was the loud bang ! Serious issues have caused the vehicle to be inoperable !
NHTSA complaint #11615402 — an unverified report by a vehicle owner.
I have trouble codes that occasionally come up even after vehicle has been serviced. The vehicle used to drive fine. Now it started miss firing. I was told the problem was coming from the engine compartment/sensors. An OBDII diagnosis detects a problem with B Camshaft Position Timing Over Advanced or System Performance Bank 2 (p0024). I fear that without the fix, the miss firing can cause an accident. The engine light is illuminated when this happens.
NHTSA complaint #11588160 — an unverified report by a vehicle owner.
While driving vehicle warning light service stabilitrak....reduced engine power comes on. Vehicle then slows and can not drive over 20 to 30 mph. This has occurred randomly at highway speeds while driving on interstate in traffic. Sudden reduction caused traffic to have to slow quickly and almost caused a collision.
NHTSA complaint #11583554 — an unverified report by a vehicle owner.
This problem has happened for many many years. Made appointments @ Fuccillo Chevy dealer, by then it’s gone off & they don’t know! Well, just occurred again when getting new tires @Dunn pulling in. 2011 impala Stabilitrak, engine power loss, then check engine light! Thank goodness the mechanic printed me the codes & what they mean!! SO- P2138 Throttle/pedal pod sensor voltage correlation DTC P0523 Engine oil pressure sensor/switch high input Same complaint of loss of power as I’ve now seen others write about!! Voltage referring to throttle ‘s ability to open/close properly. An electrical malfunction in manufacturing! RECALL!!! Obviously I actually have another impala- 2007 that the rear defrost wire’s actually burnt @ control junction, been replaced now. Could’ve caused a fire !! High beam lights come on intermittently when using the turn signals!! Stand by your product !!!! I have 2 Impala’s, 2007, 2011. My mother has Impala, 2015. My sister has an Impala, 2017. Impala family I guess- kinda funny, all are black Impalas!!! I’ve seen numerous complaints of this same issue! Defect! R u waiting 4 an accident or a death? GO !!!! Has happened numerous times b4 This report, Chevy dealer has previously stated can’t anything because the code disappears on its own. What’s with that? Resets itself?? It does!! Sure have had it happen, 20 x’s?? I make an appointment & by that time- gone! Seriously!!! Finally caught it 2 code it !!
NHTSA complaint #11554752 — an unverified report by a vehicle owner.
Fuel pump replacement with Gm dealership parts provider now car engine doesn't shut off right after key is turned off and car doesn't want to talk gas when fueling then doesn't want to start after fueling
NHTSA complaint #11529881 — an unverified report by a vehicle owner.
Pourous plastic fuel line located on top of gasoline tank is leaking slowly...confirmed by independent (Kaerchar Automotive..699 Castle Shannon Blvd 15234)(412-563-2827) official PA inspection station. Pourous plastic fuel line line to tank leaking fuel onto gasoline tank which is leaking down over tank towards whatever is located beneath
NHTSA complaint #11522239 — an unverified report by a vehicle owner.
While driving at highway speeds the car will act up and the engine will shut off, I get the message on the odometer display that reads, Engine power is reduced, service throttle, starter disabled. This is not a good thing to have happen while driving.
NHTSA complaint #11494886 — an unverified report by a vehicle owner.
FUEL SYSTEM; CODE P0230. CAM/CRANKSHAFT; solenoid circuit in BANK 1 CODE P0010. RADIO WIRING; Radio is smoking all the time BAD GROUND WIRE OR SHORT IN WIRES. MY VEHICAL STOPPED WHILE I WAS IN DRIVE MOTION GOING APPROXIMATELY 45 MPH. No injuries, and No fatalities BUT MY IMPALA STOPPED RUNNING AND HAVE NOT BEEN ABLE TO START IT SINCE. IN ADDITION NO ONE HAD GOT HURT, I WAS IN OPEN ROAD. I HAVE NOT HAD MY THE VEHICAL SERVICED OR DIAGNOSED BY A SERVICE CENTER. DUE TO A NO CRANK/NO START CONDITION. IT WILL NOT MOVE. PRIOR TO THE FAILURE, WE HAD THE MIL on the dash say POWER ENGINE REDUCED. THAT'S WHEN AT HIGH SPEED ON FREEWAYS OR EXTENSIVE DRIVING PATTERNS.
NHTSA complaint #11477616 — an unverified report by a vehicle owner.
I have a 2012 impala that I have had since 2015 and a little while after I got it the engine light came on and it said it was the fuel pump control module requested Mil illumination and evaporated emissions systems leak detected (large leak) and at times the gas tank sparys back at up if you don't let it sit open for a little bit. I have had these issues fixed multiple times and by multiple mechanics who still can't figure out what's going on.
NHTSA complaint #11459774 — an unverified report by a vehicle owner.
For approximately 2 months, my 2016 Impala LTZ, would display a message on the small screen in front of the driver in the dash, stating for the driver to, "press ignition button again to turn vehicle off." The worst part about it was this would happen very randomly whether I would be driving in city traffic, or be sitting in a parking lot at a local store. I took it to my local Chevrolet dealership. Five different times, because they were not able to get the occurrence to duplicate for them. They replaced the ignition, as well as other suspected parts with no resolution. Resolution. Ended up costing me over $1,200. That was the first time I took it in for this issue. The other four times didn't cost me anything because they hadn't fixed the issue. Come to find out it was a wire on the body control module that had some of the insulation sheathing removed, which then in turn caused the wire to ground out on the car's frame. Just thought I would put this out there in case anybody else goes through it because it wasn't real inconvenience.
NHTSA complaint #11459171 — an unverified report by a vehicle owner.
When driving on the highway at full speed my car suddenly loses power almost causing me to be hit from behind. I then get a Reduced Engine Power warning. Once I get the car off the road, I shut the engine off for a few minutes and then restart it. The car runs fine but the check engine lights remains on. This has happen 4 times this week.
NHTSA complaint #11458634 — an unverified report by a vehicle owner.