2023 BMW I4: sudden loss of power

Filed Oct 19, 2026 · Fuel system, Transmission · CA

My vehicle intermittently loses drive power while being driven, suddenly and with no warning. Sometimes it drives normally, then fails repeatedly later. Before any warning appeared I had isolated instances of hesitation or power loss, but with nothing on the cluster I assumed I was misperceiving it. On August 25, 2026, the vehicle lost power four times while I was driving on the freeway and displayed a drivetrain malfunction warning for the first time. I took the car to an authorized dealer on August 28, 2026, at 60,676 miles. The dealer ran the manufacturer's diagnostic test plan, found multiple stored drive motor electronics faults, and identified rotor position sensor faults in both the front and rear drive motors. The manufacturer's own technical support was consulted and recommended the repairs. The estimate was about $17,353 to replace both sensors and service the 12V harness. It has worsened since. In early October 2026 it lost power six times within about 2.5 miles on one short trip. On October 15, 2026, it suddenly lost power on surface streets and I was nearly rear-ended. The abrupt speed reduction gave no warning to following traffic; a collision was avoided only because the other driver stopped in time. Because the failure cannot be anticipated, I cannot know whether it will occur while merging, at an intersection, or at freeway speed. I have substantially reduced my use of the car. The car was built in December 2022, within the range of a manufacturer bulletin on debris inside the electrical machine causing high voltage isolation faults, and within the federal safety agency Recall 25V395000, whose chronology states debris could have entered the electric drive motor during supplier production. Other owners of this model and year publicly report the same symptoms and diagnosis. The vehicle is unrepaired and available for inspection. The manufacturer has an open case but has not physically inspected it. No police or insurance inspection. No crash, fire, or injury.

Filed May 24, 2026 · Electrical, Fuel system · CA

While driving my 2023 BMW i4, the vehicle suddenly displayed multiple drivetrain and chassis malfunction warnings shortly after charging the vehicle at a ChargePoint station. The vehicle experienced a sudden loss of power/propulsion while driving, creating a serious safety concern. After stopping, the vehicle began rolling backward unexpectedly and several systems appeared to malfunction. The center display/screens became partially or fully unresponsive/blank and multiple warning messages appeared simultaneously. Due to the loss of propulsion and safety concerns, CHP assistance was required to safely move the vehicle off the roadway. The vehicle was later towed to BMW service for inspection and diagnosis. I am concerned this may involve a failure related to the electrical system, high-voltage battery system, propulsion system, drivetrain, or vehicle software. The sudden loss of power while operating the vehicle created a dangerous driving condition. The vehicle had approximately 76,000 miles at the time of the incident.

Filed Nov 18, 2025 · Fuel system, Transmission · WA

I am reporting a recurring safety issue with my 2023 BMW i4 (VIN: [XXX] ), currently at 28,426 miles. The vehicle has experienced three separate incidents of unexpected and complete loss of power while driving. The first incident occurred in March 2025. The vehicle suddenly lost all propulsion without warning and came to an immediate hard stop. I was later informed this was related to a wheel-positioning sensor. The second incident occurred in October 2025. I had been told that a recall software update would resolve the problem, but the vehicle experienced another loss of power while in motion, showing the issue was not corrected. The third and most concerning incident occurred in November 2025. Multiple error messages appeared instructing me to stop driving immediately, and the vehicle again lost power while moving. A complete loss of propulsion in traffic—especially while merging or pulling into a roadway—creates a severe safety hazard because I am unable to move the vehicle out of the way of oncoming traffic. This puts both myself and other drivers at risk. BMW has acknowledged awareness of issues related to these systems during previous service visits, but the defect continues to occur despite attempted repairs and software updates. I am requesting that the federal safety agency investigate this matter, as repeated power-loss events pose a significant safety risk that could lead to crashes, injuries, or fatalities. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jul 25, 2025 · Transmission · NC

We had a drivetrain malfunction losing all power to car as we were driving.The car lost all control and drove less than 20 feet before coming to a complete stop on the middle of the road. We were not notified about any recalls on the car and just saw there was one on your site. BMW has now had our car for 3 weeks and has had their engineers working on it saying they are testing teach individual power cell at this time. They have not provided us any feedback other than this and a timeline of when we will get our car back.

Filed Apr 26, 2025 · Brakes, Driver assistance · VA

While driving, the vehicle experiences intermittent braking failures, electrical glitches, and/or sudden loss of power. These issues match known problems reported on similar 2023 BMW i4 models. My VIN does not show an active recall, but I am experiencing dangerous symptoms. I am concerned for my safety and others. I respectfully request an investigation.”

Filed May 21, 2024 · Electrical, Transmission · CA

As I was driving my car into the main avenue out of a parking lot, the car stalled and lost all power, the charge went from 57% to 0% and the power train failure warning came on the dashboard and a high voltage warning as well. The incoming traffic had to stop since I could not move the car, so I had to turn power off and power back and only then the car started to move slowly, the battery charge went up only to 37% and both warnings were displayed on the dashboard (high voltage warning and power train failure) with a message that said that it was OK to drive the car to a dealership to get the car checked.

Filed Nov 30, 2023 · Steering, Transmission · IL

My 2023 electric BMW i4 was driving normally on the evening of 11/29/2023. I was near the end of a 30 minute commute when a drivetrain error popped on the screen followed by an error that said "increased steering effort." Within seconds of those messages, without any physical signs of an issue, the car completely lost all power and steering and abruptly stopped in the middle of the street. As the car abruptly broke down, it went into park. It was so abrupt that there wasn't even time to pull over or coast to a safer area. I was stopped in the middle of the street. I couldn't restart the car nor could I shift the car into neutral. The car required a tow to the dealership. This is a SERIOUS safety issue. Had I been on a busier street or highway and suddenly lost all power and steering, I could have gravely injured myself and others. The vehicle has since been inspected by the local service center. They said there is a manufacturing defect with the copper brushes in the electric engine. They said the fix is to disassemble the motor to perform a labor-intensive cleaning. However, what is to prevent this issue from happening again? Especially since no parts are being replaced according to BMW. A car breaking down is one thing. A car abruptly stopping and losing all power and steering is an unacceptable failure. I am scared to drive this car ever again.