Buick Encore GX transmission failure problems

Filed Nov 8, 2026 · Acceleration, Electrical · MI

Battery all of sudden will not start. New transmission at 55,000 miles Reduced power Ecs light on

Filed Oct 22, 2026 · Electrical, Engine · MA

I am reporting a recurring safety issue involving unexpected stalling and loss of propulsion in a 2022 Buick Encore GX. In February 2026, the dealership replaced the vehicle's transmission with a rebuilt transmission. Since then, the vehicle has continued to experience sporadic stalling and drivability failures over the past eight months. It has been brought to the dealership at least six times since February for inspection and repair. Despite these efforts, the problem continues. Most recently, on October 20, 2026, the vehicle unexpectedly stalled while my husband was driving in downtown Boston. It had to be towed to an impound facility and, after retrieval, was towed to the dealership, where it currently remains available for inspection. There were no symptoms and no warning lights prior to the incident outside of the months of similar sporadic incidents. The vehicle has spent more than 25 business days at the dealership since February. Despite the rebuilt transmission replacement and repeated repair attempts, the stalling issue remains unresolved. It goes without saying that unexpected stalling and loss of propulsion pose a serious safety risk, particularly in congested city traffic and on busy roadways. Sudden loss of power can leave the vehicle stranded in traffic, prevent safe maneuvering, and increase the risk of a collision. The dealership has repeatedly inspected and attempted to repair the vehicle, including replacing the transmission, but the problem continues. I have also submitted a complaint with GMC. I request that the federal safety agency investigate whether this recurring failure represents a safety-related defect affecting this vehicle or other vehicles of the same make and model.

Filed Jul 22, 2026 · Electrical, Engine · IL

I am submitting this complaint regarding several serious mechanical and electrical issues with my 2020 Buick Encore GX that raise significant concerns about the vehicle's reliability and safety. Most concerning, I was recently informed by the dealership that my vehicle requires another transmission replacement, despite having the transmission replaced in 2024. I was also advised that I would need to pay for an additional diagnostic inspection because technicians discovered oil leaking through the lines, which appears to have contaminated engine components. According to the dealership, metal particles have been found within the engine, causing it to malfunction. They have stated that they are unable to determine the source of the contamination at this time. In addition to these major mechanical concerns, I am experiencing several electrical and system malfunctions, including: The passive keyless entry system does not consistently unlock the doors using the exterior door handle, even with a brand-new battery installed in the key fob. The vehicle repeatedly displays a "Shift to Park" warning even though the gear selector is already in the Park position. The vehicle continues to display brake-related alerts and notifications indicating that the brakes need to be serviced or replaced, despite having brand-new brakes installed. These ongoing issues have resulted in repeated repair costs, loss of confidence in the vehicle, and concerns about my safety while driving. The transmission failure occurring shortly after a previous replacement, combined with unexplained engine contamination and persistent electronic malfunctions, suggests there may be underlying defects that warrant further investigation. I respectfully request that these issues be thoroughly investigated to determine whether they are related to known manufacturing defects or warrant a safety recall or other corrective action. I also request that Buick review my repair history and provide appropriate assistance.

Filed Jul 14, 2026 · Engine, Transmission · WA

When driving on the freeway 60 mph, the car jerked and locked up, no warning lights, speedometer was rising and dropping rapidly, car slowly dropped speed. Had to pull on the side of the road, when car was put to parked, neutral, or drive it went backwards until it wasn’t able to move at all. Car was towed to the GM Chevrolet in my area where it was fixed previously for transmission module issue. After inspection it was found by a mechanic that it was a transmission failure. Thankfully, we didn’t get into an accident but it was a close call.

Filed Jun 29, 2026 · Transmission · 34,500 miles · NJ

The contact owns a 2024 Buick Encore GX. The contact stated that while driving approximately 60-65 MPH on the interstate, the vehicle was shuddering abnormally while accelerating, and the transmission failed to properly shift into gear. The contact was concerned about safety while driving the vehicle at highway speeds. There were no warning lights illuminated, or messages displayed prior to the failure. After the most recent failure, the vehicle was driven to the residence. The vehicle was taken to a dealer to be diagnosed; however, the dealer was unable to duplicate the failure. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 34,500.

Filed Jun 21, 2026 · Transmission · MI

Transmission would not connect with the engine. La Fontaine dealership in Saint Clair. Said I need a new transmission cost $14,000. It has 59823 miles under the vehicle.

Filed May 5, 2026 · Transmission · NC

A 2021 Buick Encore GX with 66,828 miles experienced sudden transmission failure while driving. The vehicle lost forward gear engagement and began slipping, creating an immediate safety risk to the driver and other motorists due to unexpected loss of vehicle propulsion and control. The vehicle was diagnosed by an authorized GM dealership. Diagnostic codes P2714 (Transmission Control Solenoid Valve 4 Stuck Off) and P0700 (Transmission Control Module Request) were confirmed. The transmission fluid was found to have a burnt odor indicating severe internal damage. The check engine light was the first warning symptom, followed by slipping and loss of forward gear. General Motors previously issued Technical Service Bulletin 24-NA-009 in March 2024 specifically identifying DTC P2714 on the 2021 Buick Encore GX as a known internal defect affecting model years 2020 through 2024. This bulletin confirms GM was aware of this defect prior to this vehicle's failure. Despite issuing this bulletin, GM has not issued a recall, leaving owners of affected vehicles responsible for repairs caused by a known manufacturer defect.

Filed May 3, 2026 · Engine · FL

The 1.3L turbo caused metal fragments to get into my engine which in return caused the transmission to fail. My 2021 Buick encore gx has been in the shop since early February 2026 at Garber Buick in Fort Pierce Florida. The first diagnosis was solenoids needed to be replaced, after the solenoids were replaced they told me the engine needed to be replaced, once the engine was put in Garber Buick told me the transmission now needed to be replaced. GM motors have been involved I have case number and a case manager who has informed me that not only do they want me to pay 5,600 dollars after the first quote for the engine was 9,800 but they brought that price down to 5,600 they now since its the transmission want me to pay another 6,000 even though the car is only 2021 and the turbo caused all of this to happen. I have done some more research and GM has multiple lawsuits against them for turbo and transmission failures where GM told dealers to downplay issues.

Filed Apr 1, 2026 · Engine, Transmission · CO

Second complete powertrain failure on March 14, 2026 at 13,993 miles, nine days after first repair (complete transmission replacement for bone-dry sealed transmission). Symptoms: sudden loss of power on highway (unable to exceed 20 mph with accelerator fully depressed), hollow sound, noise described as "like a rock tumbling around inside." OnStar diagnostics returned "No Error Code Found" twice (11:14 AM and 11:17 AM) during active failure. Dealer (Loveland Buick GMC) diagnosed "battery issue" but provided indefinite loaner with no return date. Symptoms are consistent with engine bearing or connecting rod failure matching Cook et al. v. General Motors (Case No. 1:26-cv-00229, D. Del., filed March 4, 2026) covering 1.2L/1.3L turbo engines in the Buick Encore platform. Complaint alleges GM knew about defect "since 2022, if not earlier" and instructed dealers to tell consumers vehicles are "operating normally." First failure involved sealed transmission running with zero fluid. Skipped oil change after transmission repair (documented in GM Executive Resolution emails) may have allowed metal contamination to damage engine components. Requesting investigation into whether dealer's "battery" diagnosis was accurate or whether actual diagnostic codes indicate engine failure consistent with Cook v. GM class pattern.

Filed Apr 1, 2026 · Transmission · CO

Sealed transmission found "bone dry" at approximately 13,000 miles. No consumer-accessible dipstick. Complete transmission failure January 2, 2026. Second complete powertrain failure March 14, 2026, nine days after first repair completed. Symptoms on second failure (loss of power, hollow tumbling sound) consistent with engine bearing/connecting rod failure matching Cook et al. v. General Motors (Case No. 1:26-cv-00229, D. Del.) covering 1.2L/1.3L turbo engines. Dealer diagnosed "battery issue" on second failure and provided indefinite loaner. Vehicle purchased June 2025. Two failures within 9 months and 13,000 miles on a sealed powertrain system the consumer cannot inspect.