2024 Buick Envision

On April 11, 2024, the Office of Defects Investigation (ODI) opened Preliminary Evaluation PE24011 after receiving complaints concerning a loss of brake assist in 2023 MY Cadillac Lyriq vehicles. These complaints allege a hard brake pedal, followed by a “Brake System Failure” message at start up or while driving. GM shared records regarding several internal investigations for loss of brake assist due to alleged spindle fractures in the eBoost system. GM has stated that in the event of a spindle fracture, anti-lock brakes (ABS), stability control, and traction control remain functional until the vehicle comes to a complete stop. At this point, ABS, brake assist, stability control, and traction control functions are lost. The loss of these functions causes the vehicle to set one of three Diagnostic Trouble Codes (DTCs) based on failed performance criteria for the Electronic Brake Control Module (EBCM). These DTCs, in turn, activate several driver alerts: an audible chime, a visual “Service Brake System” message in the display, and multiple illuminated Malfunction Indicator Lights (MILs) for the ABS, Traction Control, and Brakes informing the driver of loss of functionality. The vehicle speed will also be limited to 70 KPH (43 MPH). Since opening PE24011, ODI has continued to receive reports of loss of brake assist. Some of these reports describe symptoms inconsistent with GM’s description of a spindle failure. These reports allege an immediate loss of brake assist functionality as opposed to the loss occurring after the vehicle comes to a complete stop. The sudden loss of brake assist during a braking event could result in extended braking distance, which increases the risk of a crash or injury. ODI believes further analysis is necessary to assess the potential for failures in GM’s eBoost system to resulting in safety-related outcomes. At this time, ODI is aware of the following vehicles that are equipped with this eBoost system: 2023-2026 MY Cadillac Lyriq, Chevrolet Colorado, and GMC Canyon; 2024-2026 MY Buick Enclave, Envision; Chevrolet Blazer EV, Equinox EV, Traverse; Cruise Origin; and GMC Acadia; 2025-2026 MY Cadillac Celestiq and Optiq. ODI is also aware of 2024-2026 MY Acura ZDX and 2024-2026 MY Honda Prologue vehicles that were built with this system. The Acura and Honda vehicles were manufactured by GM in a joint venture with Honda, and will be included in the Engineering Analysis as peer vehicles. ODI is opening this Engineering Analysis to further assess the safety-related consequences of a failed eBoost system. In addition, ODI is expanding the scope of the investigation to encompass all GM vehicles that share this eBoost system. To review the ODI reports cited in the Opening Resume ODI Report Identification Number document, go to NHTSA.gov.

The master brake cylinder failed. not once but twice. It is available for inspection at the dealership currently. I lost the ability to be able to stop my car and use my brakes. Luckily I did not hit anyone elses car as I had to pull off the freeway. This is a major safety and liability concern. Yes, the problem has been confirmed by the dealer. The vehicle has not yet been inspected by a GM engineer yet for the 2nd time it happend. No, the only watning signs that came on was when the failure was occuring.

NHTSA ID

11762993

Incident

Sep 5, 2026

Driving and open areas or in town car will automatically break. Multiple times over 45 miles an hour and lock up the brakes then accelerate car has been in and out of the dealership 7 to 10 times1 time for 10 months straight. Vehicle collision lights have come on for side rear and front collisions when brakes lock up and then accelerate we videoed and taken pictures showing no cars surrounding during instances. The last lockup cause injuries to my son and my wife’s neck. They are seeking medical attention today.

NHTSA ID

11751180

Incident

Jul 16, 2026

Same as in the other two complaints. At one year and approximately 5000 miles I personally did the first oil change. Car was approximately 3 quarts low on oil after draining the oil for the oil change. Filled up to manufacturers recommendation. Two months later and approximately 1000 miles on the car, the car was 1 quart low. GM has a bulletin on this very issue bulletin number 01–0 6–0 1–011N. Started oil consumption test through the dealer. Dealer stated the first remedy is replacement of a valve, followed by another consumption test. Next option is replacing the engine.

NHTSA ID

11731843

Incident

Apr 16, 2026

The contact owns a 2024 Buick Envision. The contact stated that while in reverse(R), the vehicle started rolling backwards and independently stopped. There was no warning light illuminated. The vehicle was taken to a local dealer, where an employee suggested disabling the parking brake. The vehicle was not diagnosed or repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 2,000.

NHTSA ID

11728798

Incident

Apr 2, 2026

Mileage

2,000 mi

Description of Safety Defect: While operating the vehicle at approximately 25-30MPH and make a right turn, the vehicle experienced a sudden and total loss of power/engine stall, accompanied by a "Check Engine" light and a "Reduced Engine Power" notification. This resulted in a near-collision on a public roadway. The vehicle's steering and braking response were significantly compromised during this event, creating an immediate life-safety hazard for the driver and passengers. Dealer/Manufacturer Response: The vehicle was recently in the possession of McGovern Buick GMC Westborough for service. Despite the vehicle exhibiting an active Check Engine Light (CEL), the dealership staff pressured the consumer to take delivery of the vehicle and drive it on public roads. The service advisor admitted in writing that the CEL was active but insisted the vehicle was "feel free to drive." Furthermore, the dealership attempted to falsify internal corporate safety notes to claim the consumer "insisted" on taking the vehicle, masking a known mechanical defect. This represents a willful suppression of a safety defect by a franchised dealer, which led directly to a hazardous operating condition. Injuries/Crashes: No crash occurred, but a near-miss was documented. Passenger experienced severe emotional distress due to the sudden loss of vehicle control in traffic.

NHTSA ID

11725228

Incident

Mar 15, 2026

“Loss of vehicle stability” “Feels like wheels may detach” “Ride height abnormal” “Unresolved after multiple repairs” “Safety risk”

NHTSA ID

11714882

Incident

Jan 1, 2026

The vehicle was taken in for the oil level not registering on the dip stick 5235 miles on the odometer, they said it was 2 quart oils low. They said they would do an oil consumption test and to bringv it back in 2000 miles. We took it back with an odometer reading of 7451 and it was again 2 quarts oils low. There is an oil consumption issue on this vehicle.

NHTSA ID

11675969

Incident

Apr 28, 2025

Prior to the first oil change which is recommended at 7500 miles, I check the oil and there was NO oil present on the dip stick...none, not a drop. I had to add 1 3/4 quarts to get it in the accepted range. We took the car for its normal 7500 mile oil change and informed the dealer, upon inspection and oil change they said nothing was wrong with the car. About 2000k miles after that oil change I checked the oil again and again it was well over a quart and 1/2 low. I added enough oil to get the oil level into the accepted range. I made an appointment with the dealer and they looked at the car and said it was 3/4 of a quart low upon arrival and want me to start an oil consumption study. My concern is if this car is using that much oil, its a matter of time before engine failure and what if this happens at speed or when I am on the expressway, it feels like a safety concern to me.

NHTSA ID

11659255

Incident

May 1, 2025

This PI is to instruct dealer on diagnostic procedures that need to be completed prior to replacing a radio or IPC display

This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.

This preliminary information is to inform technicians that GM is placing the B174W Front View Camera Module (ACP2) on part restriction due to elevated replacement rates and ongoing engineering investigation. Technicians must not replace the front camera module unless they have: 1.Completed the diagnostic procedure in this PI, and 2.Contacted TAC and received authorization, including the SI document number and specific step that directs camera replacement.

This Preliminary information communicates to the technicians a diagnostic tip if a technician loses communication with the image processor #2 and how to restore communication

This preliminary information is to inform technicians that GM is placing the B174W Front View Camera Module (ACP2) on part restriction due to elevated replacement rates and ongoing engineering investigation. Technicians must not replace the front camera module unless they have: 1.Completed the diagnostic procedure in this PI, and 2.Contacted TAC and received authorization, including the SI document number and specific step that directs camera replacement.

This Preliminary information communicates to dealer to perform a MEC reset for wireless projection issues