BMW 330I loss of power problems

Filed Oct 18, 2026 · Airbags, Body · CA · crash

RE: Federal Safety Defect Crash Report & Evidence Preservation Notice Associated Recall: the federal safety agency Recall 24V‑104 (BMW Integrated Braking System Defect) VIN: [XXX] Vehicle: 2025 BMW 330i Date & Time of Incident: [XXX], at approximately [XXX] INCIDENT SUMMARY & DEFECT DESCRIPTION: On [XXX], at approximately [XXX], I was operating my 2025 BMW 330i (VIN: [XXX]). While executing a reverse maneuver, the vehicle experienced a sudden electronic failure of its Integrated Braking (IB) system. The brake pedal instantly locked up, becoming rock-hard and completely unresponsive to mechanical pedal force. Due to the complete loss of power braking assist, the vehicle could not be slowed or stopped, causing a complete loss of vehicle control. This resulted in a vehicle spin, a structural collision/impact, and full airbag deployment. The vehicle’s onboard diagnostic system caught this internal electronic component failure and transmitted an emergency brake system warning to my mobile app at [XXX]. CORRELATION TO KNOWN RECALL: This failure directly aligns with active the federal safety agency Recall 24V‑104 for an internal electronic short-circuit within the Integrated Braking System module, causing a sudden, total loss of power braking assist. DEMAND FOR EVIDENCE PRESERVATION: I demand that all electronic control units (ECUs), Event Data Recorder (EDR) "black box" logs, freeze-frame failure data, and the Integrated Braking System module be safely preserved without modification, overwrite, or code-clearing for forensic data download and investigation INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Mar 31, 2026 · Engine · KY

The engine overheated and suddenly lost power/ acceleration while driving in rush hour traffic at highway speed. I had to move across 3 lanes of traffic to get on to shoulder of highway safely while car and engine sputtered and slowed to a stop with no power or acceleration. After having vehicle towed I was told by certified technicians that the oil filter housing was made of plastic with coolant lines inside and failed causing rapid coolant loss with no low coolant warning and ultimately loss of engine and power.

Filed Mar 5, 2026 · Engine · VA

The Active Grille Shutter (AGS) system on my vehicle suffered an internal mechanical failure (fault codes 138206 and 138224). These shutters are a critical part of the engine cooling system. Failure of the AGS to operate correctly leads to immediate engine overheating risks, potential sudden loss of power (Limp Mode) in high-speed traffic, and thermal damage to engine components, posing a severe safety hazard. The manufacturer, BMW of North America, has officially acknowledged this defect via Extended Warranty SIB 01 03 25. However, both the local dealer (BMW of Sterling) and BMW of North America corporate office have formally refused to honor this safety-related warranty repair. Despite clear video and photographic evidence showing zero external impact to the vehicle's front end or grilles, both parties claim 'outside influence' without providing any technical proof or documentation of such impact. By refusing to repair a known cooling system defect, the manufacturer and the dealer are forcing a vehicle with a high risk of overheating back onto public roads. This represents a systemic failure to address a safety-critical component under a federally protected warranty

Filed Feb 17, 2026 · Transmission · UT

I am reporting a premature failure of two critical engine components: the Heat Management Module (Coolant Pump/Thermostat assembly) and the Oil Filter Housing. Despite the vehicle's low mileage (40,000 miles), the Heat Management Module began leaking coolant, posing a significant risk of engine overheating and sudden loss of power while driving. Simultaneously, the Oil Filter Housing has developed a leak, allowing oil to seep onto the engine block and potentially onto the serpentine belt. Both failures represent a safety hazard: Coolant Leak: Risk of thermal engine damage and being stranded in traffic due to overheating. Oil Leak: Risk of oil contacting hot exhaust components (fire hazard) or causing the serpentine belt to slip/fail, resulting in a sudden loss of power steering and charging systems. These components appear to have failed due to manufacturing or material defects rather than standard wear and tear for a vehicle of this age and mileage

Filed Jun 21, 2025 · Electrical · MO

While driving, my 2020 BMW 330i suddenly entered “drivetrain limited power” mode, severely restricting acceleration and overall performance. Upon diagnostic review, the cause was found to be a failure of the Heat Management Module (HMM). This created a hazardous situation as the vehicle unexpectedly lost power while merging into highway traffic. Researching online, I’ve discovered numerous reports from other BMW owners experiencing the exact same failure on this model and other recent 3-series vehicles. This component failure is both common and costly, and yet there has been no recall or formal action from BMW to address it. Worse, the HMM is not covered under third-party powertrain warranties because it is considered an electronic part, leaving many owners with unsafe vehicles and no support. Given how widespread this issue appears to be — and the serious safety risk posed by sudden engine power loss — I urge the federal safety agency to investigate this component for a potential recall or required manufacturer remedy.

Filed Dec 4, 2024 · Engine · OH

On 12/03/2024, while traveling at approximately 35mph, the "top off coolant" light came on. After traveling for approximately 10 more minutes, in route to get coolant, a warning message came on the screen advising to drive cautiously to prevent engine scorching. The vehicle then began to slightly lose power while traveling on a busy road. The vehicle was then shut down and towed to BMW dealership. During the tow, it was discovered that coolant was leaking from the center area of the engine block. The manufacturers dealership service rep advised that the technicians discovered that the oil filter housing needed to be replaced. They also found that the coolant pump also needed to be replaced. The rep advised that the coolant seal on the oil filter housing had worn down and caused the coolant leak. He also advised that the coolant pump needed to be replaced, as it was also leaking. It was later discovered because the valve that the pressure propelled, hot coolant flows through in the oil filter housing is made of plastic, it often wears down and coolant leaks out heavily. The water pump is also effected by the part manufacturing issue. In addition to receiving a $4,270.42 invoice for repairs today, we just recently purchased the $199.00 BMW Vehicle Check Service from the dealership on 9/23/2024. At that time, we were advised there were no issues with the vehicle. We have sense learned that there have been multiple recalls on various BMW models for this exact same issue. However, the VIN on my vehicle has not yet been identified for recall. Had this issue gone on for mere moments more, the engine could have caught fire, and or, a catastrophic crash could have ensued, effecting any driver on the road.

Filed Apr 16, 2021 · Engine · 36,500 miles · KS

On the way home from purchasing this vehicle as a cpo at the bmw dealer, a loud engine knock developed. Made an appointment at the bmw dealer to check it, and on the way there, it lost power & engine malfunction warning lights illuminated. Had to pull off highway, fearing car would stop running altogether. Diagnosis was failed rod bearings, with lots of metal shavings in the oil filter. Mileage was 36,500 miles.

Filed Jan 21, 2021 · Engine, Fuel system · 120,000 miles · CA · crash

Loss of power the battery dies quick and alarm system goes off randomly and the car has lost acceleration air bag needs replaced and the car makes noises

Filed Aug 14, 2019 · Electrical · 164,129 miles · AZ

Complete loss of power, shut car off for a few minutes, when tryi g to restart vehicle noticed zero power to any components

Filed Dec 20, 2010 · Engine, Steering · 50,000 miles · NJ

Engine stalls on a few occasions when vehicle was turning left at low speed, causing temporary loss of power steering. Was able to quickly re-start the engine every time but could have caused crash otherwise. This occurred more frequently after 2008 (and after 60k miles), both at low speed on local roads and at 45 ~ 55 MPH on highways, summer or winter conditions, with or without AC turned on. Occurrences are infrequent and unpredictable. Reported to my bmw dealer several times but dealer was unable to replicate the problem and unable to diagnose the issue. Otherwise, the vehicle drives perfectly fine and I love it.