2023 Buick Envision

While driving in traffic, after changing lanes, the vehicle experienced a complete electrical shutdown without warning. The engine shut off, the dashboard went completely black, and hazard lights were not functional. There were no warning lights, messages, or audible alerts prior to the failure. The vehicle was in active traffic and, stopped without power steering or brake assist. After opening the hood, multiple wiring harnesses and a loose battery cable were visually observed. When wiring was physically moved, electrical power was immediately restored. Upon restart, the vehicle hesitated to start and then displayed messages instructing the driver to open and close the driver and passenger windows, indicating a full system reset due to power loss. We were able to return home safely. Parked the car, and obtained a rental. The vehicle had been serviced by the Buick dealership where the car was purchased, three days earlier. Two days after the incident, I was able to speak to someone at the dealership, who stated they may have bumped something. The vehicle was towed to the dealership, and assessed. The dealership later documented a loose battery cable and promised to replace a fatigued clip, but denied responsibility for the incident. I contacted the manufacturer, and was referred back to the dealership.The vehicle has only been inspected by the dealership. This incident created a serious safety risk, to our lives, as well as our fellow drivers' lives, as the vehicle lost all electrical power, including required safety lighting, while in traffic, without warning. The vehicle is available for inspection, upon request.

When letting off the accelerator to slow coming to a stop I would press the brake pedal. but the motor would increase RPMs and I had to use both feet to stop the vehicle. Then I had to put the car in neutral and the RPMs would increase even though I was at a stop and then I had to put it in Park before the RPMs would drop. I removed the driver's floor mat encase it was effecting the accelerator. The vehicle didn't act this violent but it failed to decelerate several times before I could get it to my local dealer.

The contact owns a 2023 Buick Envision. The contact stated while driving approximately 60 MPH, the vehicle lost motive power, decelerated, and no longer accelerated as needed. After drifting to the side roadway, the contact discovered that the check engine warning light was illuminated, and the transmission had erroneously shifted into neutral. The vehicle was later taken to the local dealer to be diagnosed. The contact was informed that the fuel pump module was faulty and needed to be replaced. The vehicle was not yet repaired. The manufacturer was not yet notified of the failure. The failure mileage was 3,130.

I had the brake fail twice in the past 2 months while driving the vehicle and was not able to stop it. I kept pushing on the break pedal but vehicle wouldn't slow down. I was only able to stop the vehicle by shifting the gear to neutral and letting the car come to stop on its own. While driving along, multiple signs such as malfunction indicator light, brake light, ABS light, traction control, electronic stability control, Forward collision system failure etc lit up on the dashboard and I could no longer slow the vehicle down using the brake pedal. The image of the dashboard with all the lit up signs is attached for your reference. Once the vehicle came to stop, I turned it off and waited to catch my breath. When I turned the vehicle back on, most lights were off but malfunction indicator light was stayed on. However, brake started working. I narrowly avoided hitting a car in front of me on the highway because I couldn't slow down the vehicle. I would have hit the vehicle in front of me if it had slowed down. It put my life along with of those around me on the freeway in danger and it could have turned out a lot worse. I am taking the vehicle to the dealership tomorrow morning. Prior to the brake fail, there were no warning lights, messages, or other symptoms of the problem. The warning lights only came on while I was driving and the brake was no longer working.