There are 3 owner-reported powertrain & transmission complaints for the 2021 BMW 3 Seriesin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
1. The engine starter motor (specifically the pinion starter) has failed, and the auxiliary battery is also showing reduced capacity (only a portion of its 660 cold cranking amps). The vehicle is currently at a service center where the technician has diagnosed these issues. The components should be available for inspection upon request, as they have not yet been replaced. 2. The failure of the starter motor and battery primarily affects the vehicle's ability to start. While this could potentially strand you in an unsafe location, the information provided does not indicate any specific safety incident or risk that occurred during operation. No direct safety hazard has been reported. 3. Yes, a technician has diagnosed the problem and confirmed a fault code in the drivetrain related to the failed starter motor. The technician also identified the auxiliary battery's reduced output. This confirmation comes from a service center, which could be a dealer or independent shop. 4. The only inspection mentioned is by the technician at the service center. There is no indication that the manufacturer, police, insurance representatives, or others have inspected the vehicle or components. 5. Yes. Prior to the failure, when starting the car in the early morning, a "drive train service" message appeared on the display, advising you to visit a service center as soon as possible. This warning was the first symptom of the problem before the starter ultimately failed and the battery drained. This aligns with the technician's diagnosis of a drivetrain fault code related to the starter motor.
Engine Wiring is made of Soy products with attracts Rodents to feed and destroy the wiring. When this occurs it puts the driver ad passengers in danger because certain functions such as brake light, Headlights and windshield wipers may not work properly. This is becasue when the wiring is compromised , circuits are broken which causes the vehicle's systems connected to that circuit to partially or completely fail, Rending a vehicle partially or completely inoperable. The vehicle was inspected the the BMW dealership service center and they confirmed it was rodent damage . Geico insurance also inspected the vehicle. The vehicle started to restrict engine performance and the Engine service light came on stating there was a Drive Tran malfunction.
In Buford GA at the corner of Elm Tree Terrace and Buford Dam road, I was waiting for the light to turn on a decline. It is important to note that the car was driving in all-electric mode on a full charge. Once the light turned green I stepped on the accelerator to go and the car stalled. I believe the transmission slipped. The gears caught at high torque and jolted the car involuntarily forward. I didn't notice it at first but after a couple of sleepless nights with shoulder pain: I got an MRI and was found to have a torn rotator cuff. It is difficult to associate the injury as it is hard to access the force applied to the jolt. The only word I can use to describe the force of the jolt was violent. I believe there is a safety issue when a high torque electric motor is being run through a slipping or failing transmission and I suspect as a result I have suffered a injury as a result.
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 26, 2026