Table 1 shows one common engine and engine cooling related problems of the 2020 Buick Enclave.
| Problem Category | Number of Problems |
|---|---|
| Engine And Engine Cooling problems |
The vehicle developed an exhaust leak caused by both weld points on the front exhaust pipe breaking. A dealership inspected the vehicle and confirmed that the exhaust welds had failed, creating a hole in the exhaust pipe and triggering a p0420 catalyst efficiency code. The failure occurred at approximately 31,500 miles. The exhaust leak caused increased exhaust noise and emissions warning codes. The dealership recommended replacement of the front exhaust pipe assembly. This appears similar to known failures on the Buick Enclave and Chevrolet traverse platform where the front exhaust pipe mounting bracket separates from the pipe due to weld failure. Gm has issued special coverage adjustments for similar exhaust pipe bracket weld failures on other model years of these vehicles. The failure occurred at relatively low mileage and appears to be a structural weld defect in the exhaust system.
Dear NHTSA safety team, I am submitting a formal safety complaint regarding my 2020 Buick Enclave (VIN: [xxx] ). My vehicle has experienced repeated engine shutdowns while driving, creating a serious safety hazard. Vehicle & incident details: * make/model/year: 2020 Buick Enclave * VIN: [xxx] * mileage: ~116,834 miles (purchased at ~62,000 miles, used) * purchase date: [insert month/year] * dealer: kyle durrence claxton dealership repair history: * first repair attempt: tpms system * second repair attempt: connector assembly block * total out-of-pocket spent: $4,000+ * despite these repairs, the vehicle continues to shut off unexpectedly while driving. Safety impact: * engine shuts off while the vehicle is in motion, creating a risk of collision. * vehicle is my only mode of transportation. * dealership has not provided a loaner vehicle. Additional concerns: * I have discovered forged signatures on my original finance/loan paperwork from the dealership, which I previously reported to the dealership general manager without response. Requested action: I request that NHTSA record this safety issue, investigate the repeated engine shutdowns, and consider whether this defect warrants a recall or further manufacturer action. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).
The contact owns a 2020 Buick Enclave. The vehicle was reversed out of the driveway; however, after shifting into drive(d) and depressing the accelerator pedal, the vehicle jerked, vibrated, and the check engine warning light and other unknown warning lights illuminated. After several minutes, the vehicle functioned as intended. A short distance later, the failure reoccurred. The vehicle was taken to auto zone, but no cause for the failure was found. The vehicle was taken to a private dealer where it was diagnosed and determined that the catalytic converter was clogged, and that the electronic brake control center module and the transmission module had failed. The vehicle was not repaired. The contact stated that the failure persisted. The manufacturer was not made aware of the failure. The failure mileage was unknown.
Front exhaust flex pipes had to be replaced. It’s a common problem and a recall exists for the prior year.
I came to a stop in the left turn lane at an intersection with a red light with the car in drive and my foot engaged on the brake to wait for the light to turn green. The car suddenly and completely died and all power was shut down. I was not able to engage the hazards. It was dark outside and I was afraid cars behind me would hit me. It was an incredibly dangerous situation with no warning. I exited the vehicle and got to the side of the road. The police arrived and were able to push the car to the side of the road as well. I opened the hood and checked the negative battery terminal and upon pulling the lever, the power came back on. We have an appointment at a gm dealership on Monday to fix the issue to ensure we are not put at risk again.
The front exhaust pipe bracket has broken. Upon investigation, this is an ongoing issue for 2018-2019, and 2021-2023 chevy traverse and Buick Enclave models, but not 2020. All of the models use the exhaust system and same bracket, and it should be included as a special coverage. In fact, the attached picture of my vehicle will show that it is an identical break to those pictures used in the previous bulletins. Any help is appreciated. Reference: n252503850, n242445280, n222385510, n212356540, and photo attached.
Front exhaust bracket detached from exhaust. An issue that has resulted in a hole in my exhaust. This same issue has been identified and warranty extended for 2019 and 2021 Enclaves with the same engine and exhaust parts. Dealership wants to change $1000 to fix the issue.
Welds have broken loose from exhaust creating a hole and loud noise & strong exhaust smell.
The vehicle's exhaust intermediate pipe mount has broken has caused damage in the intermediate pipe requiring both the be replaced. The cracked exhaust allows exhaust fumes to enter the passenger compartment. A recall (n222385510) for 2021 Chevrolet traverse has been made however is addressing this on only the 2021 models, even though the same issue is applicable to other models. On the this forum, there are several complaints of this design flaw reported. Https://gmauthority. Com/blog/2023/06/gm-to-fix-2021-chevy-traverse-front-exhaust-pipe-issue/.
2020 Buick Enclave mounting bracket separated from the front exhaust pipe which caused a hole to appear in the exhaust pipe. This is a known issue for 2019, 2021, and 2022 Buick Enclaves. No warning light the exhaust fumes along with carbon monoxide were coming through my ac vents for several months. There is no indication on when the mounting bracket separated.
The mounting bracket on the front exhaust pipe separates from the pipe. This issue has been identified on 2019 and 2021 models and special coverage adjustment n212356540 front exhaust pipe has been issued. The same exact defect has occured to my 2020 model Enclave.