Had an oil change through BMW with their pre-packaged oil service. 6 days later my oil pump chain guard broke inside the engine and now they're telling me I need a new engine which cost $33,000. I believe the chain guard was either broken during the time of their possession or they could at least have told me that the chain guard was cracked or broken when they did the oil change by looking down the oil cap. They explained to me looking inside the oil cap is how they know the guard has broken and the chain has stretched. So during the oil change they should have been able to tell me or show me that that was a possibility or it was broken. I received my car back in good health with all green lights checking that the car was in top shade condition and 6 days later the car is totaled.
NHTSA complaint #11757157 — an unverified report by a vehicle owner.
I had started my car drove out of my parking lot as I approached the highway the first intersection everything went dead no lights, snow warning lights just completely shut down and rumble as if the engine was gonna fall out a police man passed me. I was stuck in the middle of the highway. Help me push my vehicle off the road and sat with me while I called AAA. He could not get the car started. It was not the battery. He also only checked the battery terminals under the hood he hooked his portable battery charger. just gonna let me drive home hooked up, but it would not start.
NHTSA complaint #11755391 — an unverified report by a vehicle owner.
I was pulling out of a parking spot and my X3 completely stalled and lost power. I got infomation on my screen to take my car to my dealer as soon as possible. I was able to start and drive it home. The following week I took it to the dealer for the problem. My local BMW dealer has had my X3 since July 27th over 2 weeks. They said they waiting for a code or fix for what happened. I don’t know if it’s a power train or engine problem. My X3 only has 21,000 miles on it. My concern is this problem could have happened on highway and I could have had a different outcome.
NHTSA complaint #11755469 — an unverified report by a vehicle owner.
While driving on a two-lane 40 MPH road in the left lane the vehicle suddenly lost power, stopped in traffic, and displayed a transmission warning message. Multiple warning lights were "on" and the car would not restart. Additionally, the vehicle would not come out of "Park." Occupants needed to await police who stopped traffic in order for occupants to be able to exit the vehicle safely. The vehicle was towed to BMW of Atlantic City located at [XXX]. Technician found ground missing at EGS, inspected ground strap on transmission and found it severely corroded. Technician replaced ground strap and vehicle was repaired. Was advised by dealer service department that when this situation occurs, the only way to get the transmission into neutral in an emergency is to disconnect the transmission linkage under the vehicle. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
NHTSA complaint #11751025 — an unverified report by a vehicle owner.
belt tensioner failed while on highway without warning, leading to complete shutdown of the engine. Car had to be towed for repair. Complete disintegration of the timing belt, the car only had 51,000 miles. Expensive repair
NHTSA complaint #11749484 — an unverified report by a vehicle owner.
Heat Management Module HMM is bad. BMW used a plastic part that is right up against the engine block. This HMM Heat Management Module resulted in STOPPING the vehicle completely in the middle of the freeway. I had no control. Then the car drove, then stopped again. I had NO CONTROL over the vehicle. Weeks later the Drivetrain Malfunction warning light appeared as i was driving home late at night from the ER. I took it to my BMW dealer. The diagnostic test was performed and was told the Heat Management Module HMM needed to be replaced at a cost to me of $3000. I contacted BMW USA, explained what transpired and they responded with a denial. I stopped driving the car completely after i found other complaints about BMW using an inferior part on the 3 series and the same issue about the car stopping in highway traffic without any control. I later got my BMW repaired, at the BMW dealer, as i could not afford to buy another car. I have the defective inferior part in my possession for inspection by NHTSA. BMW refuses to recall the Heat Management Module HMM and will not address the Drivetrain Malfunction warning light. I would like this to be escalated and investigated by NHTSA.gov so that others may be safe when driving please. Thank you.
NHTSA complaint #11749367 — an unverified report by a vehicle owner.
I started to pull forward from a pharmacy drive-through at an intended low speed (approximately10/15 mph) for a right turn onto a driveway. The car was on auto-hold and in drive gear. When I turned right, the vehicle went into a full throttle acceleration and continued until impact. Brakes were totally ineffective. A TWO-LINE BRIGHT YELLOW MESSAGE FLASHED IN THE INSTRUMENT PANEL, "TRANSMISSION MALFUNCTION". There was no automatic braking or forward collision function. I made a hard left turn in about 40 feet to avoid a shopping center parking lot. The vehicle continued until colliding with a concrete filled bollard and an automotive electric charging station. The vehicle charging at this station was also struck. My vehicle fell back, landing on its right side. The driver's airbag and both side curtains deployed. I was left suspended in the seat belt until the Fire Department, Emergency Services and the Highway Patrol arrived. A Jaws of Life was used to open the sunroof and extract me. I was transported by ambulance to an emergency treatment center. I was examined there and imaging done. I sustained a ruptured tendon in the middle right finger (permanent damage) and sagittal band ruptures in two fingers on that hand. There were numerous scrapes and bruises on the left thigh, both forearms and hands as well as minor cuts on my forehead. Also, post -accident, I experienced neck pain and overall soreness for several days due to whiplash. The Event Data Recorder was unattainable as insurance paid the claim for the totaled car within one week and assumed ownership. According to the salvage yard, it was sold shortly thereafter. Refer to NHTSA ID number 11659896 for this issue with another 2024 BMW x3 Photos to accompany complaint will be sent by email with VIN #
NHTSA complaint #11740159 — an unverified report by a vehicle owner.
My 2019 BMW X3 equipped with a B46 engine developed a significant coolant leak at approximately 80,000 miles. The vehicle displayed a low coolant warning, and coolant was visibly leaking underneath the vehicle. Around the same time, I began noticing excessive white exhaust/steam during cold starts and, for the first time since owning the vehicle, had to add engine oil between scheduled oil changes. The vehicle is currently undergoing inspection by an independent repair facility. Preliminary findings indicate concerns involving premature failure of critical plastic cooling system and/or oil filter housing components. Based on my research, these failures appear consistent with widespread complaints involving BMW B46/B48 engine cooling system and oil filter housing defects. I am concerned this defect could lead to sudden coolant loss, overheating, engine failure, or unsafe driving conditions. Prior to the coolant warning appearing, there were no significant alerts indicating a major or imminent cooling system failure. The apparent failure of critical plastic engine cooling components under normal driving conditions raises serious concerns regarding the durability and safety of these parts. I have photographs documenting the coolant leak, as well as detailed notes and diagnostic information from the repair facility, available upon request. The vehicle is available for inspection.
NHTSA complaint #11739354 — an unverified report by a vehicle owner.
I am filing a safety complaint regarding a catastrophic timing chain failure on my 2014 BMW X3 xDrive28i equipped with the N20 engine. While driving, the timing chain and oil pump drive chain failed without warning. This is a well-documented defect on BMW N20/N26 engines that has been the subject of extended warranties and numerous consumer complaints. This failure can cause sudden engine seizure, immediate loss of power steering and braking assist, and creates a serious risk of crash while the vehicle is in motion. BMW issued an Extended Limited Parts Warranty for this exact defect (timing chain and oil pump drive chain), acknowledging a manufacturing defect. However, BMW is refusing to cover my repair even though this is a known safety issue affecting thousands of vehicles. The vehicle had been properly maintained, and there were no warning signs before the failure. I purchased the vehicle in October 2021, and this defect occurred during normal use commuting to work. The cost of repair is extremely high due to the internal engine damage caused by the timing chain defect. This is not normal wear and tear. This is a known design/manufacturing defect that BMW has been aware of for years. Also, when I purchased this vehicle, the headlights, and taillights on the hatchback were not working. I had brought this up to the dealership they replaced the headlights, but did not address the tail lights. I am requesting that NHTSA investigate this defect further, and the tail lights as these failures create a significant safety hazard for drivers and other vehicles on the road.
NHTSA complaint #11732798 — an unverified report by a vehicle owner.
I am reporting a potential safety defect in BMW vehicles equipped with the B58TU engine, primarily model years 2019–2021. These vehicles use an oil pump containing an internal plastic component responsible for regulating oil pressure. This component has been reported to fracture in service, resulting in sudden and complete loss of oil pressure. Failures commonly occur during cold starts in low ambient temperatures. When the component fails, oil pressure may become erratic or drop to zero with little or no advance warning. In some cases, drivers may observe warning signs such as inability to measure engine oil level electronically, abnormal oil pressure behavior, or drivetrain malfunction warnings. These conditions can rapidly escalate to engine shutdown or severe engine damage due to oil starvation. This defect presents a significant safety risk, as vehicles may become disabled unexpectedly while driving or shortly after startup. Sudden loss of propulsion increases the risk of traffic incidents, particularly if the vehicle becomes immobilized in active traffic lanes. The risk is heightened in winter conditions, when failures are more likely and occupants may be exposed to freezing temperatures while awaiting assistance. Repair typically requires extensive engine disassembly, with costs ranging from approximately $6,000 to $8,000, excluding potential engine damage. A key concern is that owners cannot reliably determine whether their vehicle is equipped with the original plastic component or a revised metal version. BMW’s VIN-based parts systems now reflect updated components even if the original part remains installed, and the original plastic component is no longer listed in dealer parts catalogs. Reports indicate failures across multiple production years, and the full scope of affected vehicles is unclear. Given the potential for sudden vehicle disablement without adequate warning, this issue warrants investigation as a safety-related defect.
NHTSA complaint #11729361 — an unverified report by a vehicle owner.
Over about seven years and roughly 70,000 miles of ownership, this 2012 BMW X3 generated repeated “Drivetrain malfunction” warnings and loss of drivability despite extensive repairs by multiple authorized BMW dealers. I paid approximately $15,000–$20,000 out of pocket for dealer repairs, and my third‑party service contract (CarShield) paid an additional roughly $15,000–$20,000 directly to these BMW dealers during this period. In December 2025, an authorized BMW dealer diagnosed a drivetrain malfunction as failure of the fuel pump control module, allegedly caused by a small water spill on the rear seat, charged me $1,690.71 to replace the module, and returned the vehicle as repaired. Shortly afterward, while driving normally, the same “Drivetrain malfunction” warning reappeared, and drivability issues returned, indicating the defect was not corrected and raising serious concerns about the safety and reliability of the drivetrain and related electronic controls. The dealer’s attribution of the failure to minor interior water exposure also caused the service‑contract administrator to void coverage for the fuel system, leaving me with this large repair bill for an unresolved safety‑related condition that ultimately forced me to dispose of the vehicle at a significant loss.
NHTSA complaint #11727392 — an unverified report by a vehicle owner.
My vehicle is subject to an active safety recall (NHTSA #25V-636) issued in September 2025 involving the engine starter. As of today, no remedy has been provided by the manufacturer. Due to the safety risk associated with this recall, I do not feel safe operating the vehicle and have been forced to keep it parked and unused for an extended period of time. This has caused significant financial hardship, as I am still required to make monthly loan payments, maintain insurance, and cover related expenses for a vehicle that is unsafe to drive. The issue has effectively rendered the vehicle unusable. The manufacturer has failed to provide a repair, replacement, or timeline for resolution. This situation places my safety and the safety of others at risk, as the vehicle may fail to start or function properly without warning. I am requesting immediate action, as this delay is unreasonable and creates both a safety hazard and financial burden.
NHTSA complaint #11725100 — an unverified report by a vehicle owner.
On Feb. 25th, 2026, while driving at high speeds (about 45 mph), the vehicle suffered a sudden and total loss of motive power. Diagnostic reports(DIACODE: D6121_00000000_01_901) later confirmed a failing 12V battery system with only 37% startability limit. This critical electrical failure coincided with the engine stalling, which resulted in the immediate impairment of electronic power steering and brake assist. This made the vehicle extremely difficult to control safely, creating a life-threatening emergency. Despite being a 2025 model with only ~11000 miles, the dealership has failed to provide 48B system diagnostic and root cause upon request and the vehicle has been out of service for over 20 days.
NHTSA complaint #11724957 — an unverified report by a vehicle owner.
This technical failure in the BMW B58TU engine (2019–2021) involves the variable-displacement oil pump's internal thermoplastic slide. In low ambient temperatures, the high viscosity of cold oil creates mechanical stress that causes this plastic component to fracture. The Safety Hazard The primary risk is a sudden loss of motive power. When the slide fails, oil pressure becomes unregulated or drops entirely, triggering an immediate "Drivetrain Malfunction" or engine shutdown. Immobilization: Vehicles may stall in active traffic or high-speed environments without sufficient warning. Environmental Risk: Failures peak in extreme cold, leaving occupants stranded in freezing conditions while awaiting recovery. Detection Gap: The electronic oil level sensor often fails to complete a measurement ("Measurement Aborted") before a low-pressure warning appears, depriving drivers of a clear precursor to mechanical failure. Critical Technical Challenges Obfuscated Parts History: BMW has superseded the original plastic-vane pump with a revised metal-vane version. However, the Electronic Parts Catalog (ETK) now lists the metal version as the "original" part for affected VINs, making it impossible for owners to verify which version is physically installed without engine teardown. High Repair Barrier: Correcting this defect requires extensive disassembly, often costing $6,000–$8,000. If the failure occurs at speed, total engine replacement is frequently required.
NHTSA complaint #11721098 — an unverified report by a vehicle owner.
Oil pump failures have been reported across multiple production years, and affected vehicle population boundaries remain unclear. Because this condition can result in sudden vehicle disablement without adequate warning especially in the cold, I believe this issue warrants investigation as a potential safety-related defect. Loss of lubrication can cause the vehicle to become disabled without warning while driving or shortly after startup. This creates a safety hazard, particularly when vehicles become immobilized in active traffic or during winter conditions the cold is when they fail the most, where occupants may be exposed to freezing temperatures while awaiting assistance.
NHTSA complaint #11721009 — an unverified report by a vehicle owner.
I'm reporting a safety issue with BMW vehicles equipped with the B58TU engine, primarily 2019-2021 models. These vehicles have an oil pump with an internal plastic component that regulates oil pressure, and this part is fracturing in the field, causing sudden loss of oil pressure. The failure typically occurs during cold starts in low temperatures. When it fails, oil pressure becomes erratic or is lost entirely, often with little to no warning before engine damage or vehicle disablement. Warning signs, when present, include inability to measure oil level electronically, abnormal oil pressure, or sudden drivetrain malfunction warnings. These can rapidly progress to engine shutdown or severe damage from oil starvation. This creates a dangerous situation because the vehicle can become disabled without warning while driving or after startup. This is especially hazardous when cars become immobilized in traffic or during winter conditions when failures occur most frequently, leaving occupants exposed to freezing temperatures while awaiting assistance. Pump replacement requires extensive disassembly and commonly costs $6,000-$8,000, assuming no engine damage. A critical concern: owners cannot determine if their vehicle has the original plastic pump or the later metal revision. BMW's VIN-based parts lookup now shows updated components even when original plastic parts remain installed, and BMW has removed the original plastic part number from dealer networks entirely. Failures are reported across multiple production years, and the scope of affected vehicles remains unclear. Because this condition causes sudden vehicle disablement without adequate warning, especially in cold weather, I believe this warrants investigation as a potential safety-related defect.
NHTSA complaint #11720995 — an unverified report by a vehicle owner.
BMW knows there is a problem with the 2013 x3 timing chain. I have continuously had my BMW serviced at there shops. Never once when my car was in for service did they mention the issue or proactively check. My vehicle now has the issue per the dealership snd indicated it is approximately a 20k repair which they included a new engine. I also followed BMWs recommendation to have the oil changed 1year or when miles were hit per their change program. Just has the oil changed in November and at the end of December now timing chain issues. Again multiple times this issue could have been identified and proactively fixed while under warrenty. Also has issues where the material on the glove box peeled off. BMW is also aware of this issue. Poor design and quality on these models/engine. Thank goodness i was not on the expressway when drivabilty issuev occurred!!!
NHTSA complaint #11708687 — an unverified report by a vehicle owner.
Reporting a failure of the engine cooling system on my 2019 BMW X3 that developed over time despite repeated repair attempts and ultimately resulted in complete engine failure. Over the past year, the vehicle has experienced ongoing coolant loss and overheating warnings despite multiple coolant-related repairs. When the problem continued, I brought the vehicle to a BMW dealership, where the service department determined that the engine had suffered internal damage consistent with overheating and advised that a full engine replacement was required. These issues occurred during normal driving and created unsafe conditions, including the risk of sudden loss of power or breakdown in traffic. Based on my experience and the repeated nature of the failures despite proper maintenance, it appears that coolant and overheating issues may be persistent in this vehicle model rather than isolated to a single component, and I am concerned that other owners may be experiencing similar safety-related defects. A investigation into this is warranted.
NHTSA complaint #11706120 — an unverified report by a vehicle owner.
Transfer case fluid has been replaced as well as drivetrain fluid in the front and rear and and the car is still having slight issues shuttering when stopping.
NHTSA complaint #11705644 — an unverified report by a vehicle owner.
On 12/5/2025, while driving my 2025 BMW X3 at approximately 35 mph on Milwaukee Ave (IL Route 21) during rush-hour traffic, the vehicle displayed a “drivetrain malfunction” warning and immediately lost propulsion; the engine completely shut down. The vehicle could not be driven under its own power and remained stopped in traffic with a minor child passenger present, creating a traffic hazard and risk of being struck (including rear-ended). Ambient temperature was approximately 12°F and we were stranded for about 2 hours awaiting a tow. The vehicle was towed and is currently at Knauz BMW (Lake Bluff, IL) and is available for inspection. The specific failed component/system is UNKNOWN at this time This is a repeat event. Approximately three days after purchase in New Jersey (6/25/2025 purchase date, 6/28 was the incident date), the same vehicle experienced a similar sudden loss of propulsion/power/shutdown while driving in heavy traffic while driving at ~60mph, again with my minor child passenger present. This same error occurred twice before the vehicle was taken to Morristown BMW and kept approximately 10 days for diagnosis/repair. Per the dealer, BMW technical assistance was consulted during that repair. The problem has recurred despite the prior repair. I believe this presents a safety defect due to sudden loss of propulsion while driving. I drive along tollway routes weekly, with speeds of 65mph+.
NHTSA complaint #11703724 — an unverified report by a vehicle owner.