2021 BMW 3 Series
Problems, recalls and owner-reported issues
Electrical system is the leading concern among 33 owner complaints filed for this model year. This is the 17th highest complaint count among 21 3 Series model years with reports.
Of the 2021 reports, 1 involved a crash and 3 involved a fire. 2 people were injured.
What owners report most often
Recalls and investigations
No safety recalls on file.
Representative owner complaints: engine
12 reports, newest first. Show all
Engine, Sep 2, 2026
I am getting error code 21A50A and 216115 which Starter Overheating that can cause fire. Similar error code were coming on other cars and BMW have recalled it the recall number is 26V056. I ask BMW and NHTSA to include 330E in this recall as 330E is similar to 330I. 330I and 330E uses same parts and similar design and excluding the 330E from this recall doesn't make sense.
Engine, May 7, 2026
25V-636 This has been unresolved for 6 months with no sign of a fix. It’s a starter motor, not the space shuttle.
Engine, Apr 21, 2026
I am submitting a claim pertaining to NHTSA Recall Number 25V636000 which pertains to a engine starter issue that can result in fire. This recall was reported first on September 23, 2025 and has been gone without a remedy. Since as of today, it has been 212 days without a solution that I am driving a car that may catch fire. This is too long and I am seeking remediation in the form of a replacement vehicle.
Engine, Mar 25, 2026
My check engine light came on stating my engine coolant was low. I took it to a shop and was told I needed to replace my filter/coolant housing assembly.
Power train, Electrical system, Engine, Feb 24, 2026
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, Dec 8, 2025
I have reached out to both the manufacturer and dealership regarding “Recall Campaign No. 25V-636: Engine Starter” who both do not have a remedy for this recall and do not have a reasonable timeframe of when it will be resolved.
Engine and engine cooling, Electrical system, Nov 21, 2025, fire
The contact owns a 2021 BMW 330I. The contact stated while driving 50 MPH and coming to a stop at a red traffic light, the contact started smelling smoke. There was no warning light illuminated. The contact turned off the vehicle, but the vehicle failed to restart with a message that the vehicle was unable to be restarted displayed. The contact turned on the hazard lights with the vehicle stopped in the middle of the road. The contact then noticed that there was smoke coming from the front end of the vehicle and immediately called 911. The contact stated that while a Metro service employee was attempting to assist the contact in towing the vehicle to the side of the road, the worker noticed that fire had started underneath the vehicle and called the Fire Department. The contact exited the vehicle and noticed that there was fire underneath the front end. The contact stated that the front end of the vehicle then burst into flames. The fire was extinguished by the Fire Department. A Fire Department report was filed. The front end of the vehicle was significantly burned. A Police Officer arrived at the scene but had not filed a report because there was no injury sustained. The Police Officer provided his badge number to the contact. The vehicle was towed to a tow lot, where it was being evaluated by the Insurance Company. The contact stated that the vehicle was a total loss; however, the Insurance Company had not yet confirmed that the vehicle was a total loss. The dealer and the manufacturer were not notified of the failure. The vehicle was not yet diagnosed or repaired. The failure mileage was approximately 30,000.
Electrical system, Engine, Nov 13, 2025
The contact owns a 2021 BMW 330I. The contact stated that while the vehicle was parked with the engine running, the engine was shaking abnormally. There was no warning light illuminated. The contact received notification of NHTSA Campaign Number: 25V636000 (Electrical System). The dealer was contacted and confirmed that parts were not yet available. The vehicle was not repaired. The manufacturer was made aware of the failure. The approximate failure mileage was 33,672.
Electrical system, Other or unspecified, Engine, Sep 29, 2025, fire
My BMW 330i 2021 caught on fire while I was driving. Smoke came from the hood, and I open the hood and seen the Fire, and I called the Newark NJ Fire Department. see attached photo of the BMW after the fire.
Engine, Sep 22, 2025
Motor mounts failed on 2021 G20 that only has 52k miles. Vehicle when purchased as CPO had 27k miles and was suppose to be inspected to be certified as CPO. In less than 30k miles from time of purchase it seems these failed early resulting in me driving the vehicle in an unsafe manner until they were scheduled for repair
Power train, Electrical system, Engine, Feb 18, 2022
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.
Power train, Engine, Fuel/propulsion system, Dec 25, 2021
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.