2018 Buick Enclave: check engine light

Filed Jun 8, 2026 · Fuel system, Suspension · IN

I am submitting this letter to formally report two ongoing issues with my 2018 Buick Enclave. First, I have experienced persistent problems with the emissions purge valve. My vehicle has repeatedly triggered diagnostic trouble code P0496, indicating a malfunction in the purge valve system. I am aware that this issue has been the subject of recall campaigns for other Buick Enclave models; however, my vehicle has not been included in any such recall, despite exhibiting the same symptoms. This malfunction has resulted in persistent check engine warnings and noticeable performance concerns, raising questions about emissions compliance and the overall reliability of my vehicle. Given that other vehicles of the same make and model year have been recalled for the same issue, I respectfully request that my vehicle be reviewed for inclusion in the recall. Second, I am formally reporting a malfunction involving the stabilizers. Recently, I have noticed unusual noises and instability when driving, particularly when turning or traveling over uneven surfaces, which indicates a potential stabilizer malfunction. These issues have persisted despite regular maintenance and inspections, affecting the handling and safety of the vehicle. I believe this may represent a manufacturing or design defect that could pose a risk to other owners of the same make and model. I respectfully request that the federal safety agency investigate this matter further. I kindly ask the federal safety agency to consider expanding the existing recall to encompass additional vehicles affected by this defect. Please advise if you require further information or documentation regarding my case. Sincerely, [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Nov 19, 2025 · Engine · 100,000 miles · IN

The contact owns a 2018 Buick Enclave. The contact stated that after picking up the vehicle from the dealer for a different failure, the exhaust pipe made an abnormally loud sound while driving. The check engine and other unknown warning lights were illuminated. The vehicle was taken back to the dealer, who determined that the catalytic converter had failed and informed the contact that the catalytic converter and the front exhaust pipe needed to be replaced. The vehicle was not repaired. The contact related the failure to Special Coverage Adjustment: N212356540 (Front Exhaust Pipe); however, the VIN was not covered. The manufacturer was made aware of the failure and advised the contact to report the failure to the federal safety agency Hotline. The failure mileage was approximately 100,000.

Filed Aug 25, 2025 · Engine, Steering · WA

Wednesday August 6th 2025, I was coming home from work, the low engine compression and engine light came on the car was shaking and I lost power on a busy road, I had to pull it off the road quickly before I lost all power. I stayed there for a few minutes, then turned the car back on to retreat to a safer spot, I then waited for my husband to bail me out, we checked the oil on the dipstick, there was minimal oil on it. We added 1 quart of oil, then the lights went off, all seemed fine. August 23rd 2025, I was driving my car and the same thing happened car lit up with low engine compression and engine light came on car was shaking, I shit the car off. we added 1quart of oil. But the engine light stayed on after about 30 min. I shut the car off. The engine light went off after I shut the car off.

Filed May 19, 2025 · Fuel system · WI

Check engine light was on due to the EVAP Purge Solenoid not sealing properly and causing a leak. Scan testing performed of the engine control module and diagnosed/cleared DTC P0496-00. Vehicle was brought to a dealership for repair.

Filed Aug 14, 2024 · Engine, Transmission · TN

My car starting sputtering on take off from stops, extremely dangerous if you’re trying to get out in traffic and keep up quickly from a stop. Then when I took it to get looked at it the mechanic said it needs a new transmission. Now my family is stuck because that’s our only vehicle big enough for our growing family. They’re was a check engine light that keeps coming on.

Filed Feb 21, 2023 · Engine, Transmission · 125,639 miles · CA

The contact owns a 2018 Buick Enclave. The contact stated that while idling or at a complete stop, the vehicle lunged forward upon acceleration. The contact then stated that while shifted to park, the vehicle inadvertently started. The contact also stated that she heard a screeching sound in the wheels while shifting in the first gear, and intermittently in second and third gear. Additionally, the contact stated that the check engine warning light was previously illuminated; however, after driving the vehicle, the check engine light turned off. The vehicle was taken three times to the dealer where the failure could not be duplicated. The vehicle was not repaired. The manufacturer was notified of the failure and the contact was informed that the warranty was not honored, and no assistance was provided. The failure mileage was 125,639.

Filed Mar 23, 2022 · Transmission · AL

Place car in park, went into store, came back out tried to put car in reverse, car would. To go, tried it two more time, car would. To go in reverse. Turned car off, put in drive , would go in drive, put in reverse, car would go, but the engine light came on and stayed on until later that day. Took car to the dealer that Monday morning, (Onstar notification says engine or transmission problem, park brake assist light came on a few times flashing on dashboard.dealer tells me first, needs to change transmission fluid. Then told me it is the solenoid switch in the transmission. Dealer calls National auto care(my warranty) and tells them that the problem, warranty wants the cause and part#. Dealer came out to look at car, stated don’t drive because their is slim metal shavings in transmission fluid. No one can tell me where it’s coming from. And the warranty company will not replace the transmission. So here I am paying a car note and a warranty. No fix

Filed Dec 17, 2019 · Transmission · IL

I purchased a new 2018 enclave in september of 2018. I received a recall letter for the vehicle sometime during the spring 2019 so I went to my dealer service department to get it check and I was told everything was fine. Then in september I noticed the check engine light came on and the vehicle would not accelerate properly so I took it to the dealer service dept. Asap. They told me there was an issue with the transmission. They said that because I had less than 5,000 miles this issue should not be occurring. It's been 4 months and I have not received a reasonable time frame for when my vehicle will be ready. My rights as a consumer have been violated because I received a defective vehicle, which put my family and I at risk. The same dealership offered to give me a loaner vehicle that ended up being defective as well. This dealership is selling defective vehicles. They have told me that about 50 other people are going through the same issue and the only I can do is be patient, but during the time I have incurred many damages and inconvenience and this deanship along with gm have not given me any sort of resolution for the past 4 months.

Filed Jun 20, 2019 · Engine · 19,750 miles · NJ

During normal commute, vehicle began bucking badly, would not accelerate and began rolling backwards. Check engine light illuminated. Shut vehicle down, restarted, and the problem seemed to clear. Brought vehicle to dealership, found codes p0011, p0014, p0021 and p0024 set. Dealership contacted gm, who acknowledged the issue but offered no fix. They are still studying the issue and have no resolution. Dealership cleared codes and released vehicle back to us. Issue may return at any time. How can I trust my family in a vehicle that may suddenly, without warning, begin bucking, stop accelerating and cause an accident? This is an unsafe condition that gm needs to address. I am disappointed that they have no resolution. Dealership referenced bulletin pip5569e, so gm acknowledges the issue. I found references from almost a year ago to this issue via google - that's very disconcerting that, in this time, gm cannot identify a fix.

Filed Jul 7, 2018 · Brakes · 1,200 miles · VA

I was driving the car and when I depressed the brakes the brakes did not engage. The dashboard illuminated with a "brake assist: alert and I could feel the ABS brakes engage. Luckily this happened while I was pulling into a parking lot. Only had 1,200 miles. Had vehicle towed to dealer. Check engine light did come on and showed code p0557. They replaced the crank shaft position sensor wiring harness and 2 gaskets, based on a repair bulletin and then before I could get the vehicle home it happened again. No brakes, but brake assist activated and ABS was able to stop the vehicle. Check engine light came on again and showed codes p0557, u0401, u0121, & u0078. Had vehicle towed to dealer again. This time they replaced part # 84341899. Luckily both instances happened at low speeds and I was able to safety maneuver the vehicle to a place where I could get towed and nobody was in front of me.