general problems of the 2018 Buick Enclave

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 NHTSA hotline. The failure mileage was approximately 100,000.

I am a [xxx] and owner of a 2018 Buick Enclave that suffered a catastrophic transmission failure which nearly killed me and my child. On Friday, [xxx], while driving westbound on [xxx] from edison, NJ to my home in easton, PA, my vehicle suddenly and without warning came to a complete halt in the fast lane. A driver tailgating me swerved at the last second to avoid impact. Moments later, when I tried to move again, the car lost all power and drifted helplessly across two lanes of speeding traffic, directly into the path of two tractor-trailers barreling down at highway speeds. This was the hottest day of the summer, and I was left in terror, fully aware that one wrong move would have ended our lives instantly. The fact that my child could have lost their only parent because of a mechanical defect is beyond unacceptable. The stress, fear, and trauma of this incident cannot be overstated—it was a near-fatal event that never should have happened. My mechanic has since confirmed the transmission is destroyed, with black metal fragments throughout—clear evidence of internal failure. Only two months earlier, in June 2024, the car passed inspection with no codes or signs of a problem. This was not wear and tear; it was a hidden, catastrophic defect. In December 2024, gm recalled more than 461,000 vehicles, including certain 2018 Enclave models, for transmission defects leading to rollaway and internal failure. Source: the lemon firm, 12/18/24 [xxx] ). My case mirrors the defect exactly, yet I never received recall notice. I demand gm confirm my VIN’s inclusion and cover the full cost of repair or replacement. I barely escaped a fatal crash. Gm must act immediately before lives are lost. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

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.

The car shuts off at random when coming out of autostop, the car will disable power steering when coming out of autostop to make turns making it difficult to turn the steering wheel. Coming out of autostop is typically when you are trying to go or make a turn. This has been an ongoing issue that happens often. The issues began around 60k miles.

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.

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.

The car has an auto-stop feature however at times, when the car is stopped, the entire electrical and engine shuts down even while the car is in drive. The driver must restart the car and put the car into park and then back into drive. When the car restarts, several lights/messages turn on including "service transmission" and the "service parking brake" message and parking break light. This is a safety and hazard issue as it has happened while in traffic on the freeway when at a standstill.

While at a stop sign at a busy intersection, pressed brake and tachometer went to off instead of auto-stop. Engine still on but pressing gas didn't do anything. . Transmission light went on. Had to push the stat/stop button a few times before engine turned off and on again.

The "start stop" feature caused a life threatening hesitation upon acceleration from a full stop at an intersection. Enclave does not offer any override for this option. There must be a firmware update provided by gm to allow it to be disabled!!! this is going to kill somebody!!!.

2018 Buick Enclave. Consumer writes in regard to engine shuting down when vehicle stops. The consumer stated the start stop feature intermittently shuts down the engine when the vehicle is idle and does not recover quick enough for safe starts in traffic.