BMW X3 engine problems

ENGINE

There were several radiatior hose leaks that happened in the winter due to the outdated plastic housing and lines that seized and cracked with colder temperatures. It has become extremely common historically and not considered affordable part or labor to replace.

NHTSA complaint #11756942 — an unverified report by a vehicle owner.

ENGINE

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.

ENGINE

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.

ENGINE

The engine mounts on my BMW X3 have failed. It is a known national issue with the car, it can be exacerbated by the star/stop feature. There are no warnings or recalls and the repair is several thousand dollara.

NHTSA complaint #11754843 — an unverified report by a vehicle owner.

ENGINE

Mileage: 31,694 (bought [new]) The engine starter intermittently fails to crank the engine and, per an open manufacturer recall, presents a fire risk while the vehicle is running. On multiple occasions the vehicle struggled to start during normal use. There was no crash, no injury, and no airbag deployment. To isolate the issue I contacted my authorized BMW dealer three times 07/01/2026, 07/16/2026 & 07/27/2026; on each call I was told no recall remedy is currently available and to call back in approximately one month. The vehicle remains subject to the open starter recall with no repair available. No relevant aftermarket equipment is installed.

NHTSA complaint #11753105 — an unverified report by a vehicle owner.

ENGINE

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.

ENGINE

Since purchasing my vehicle, I have experienced numerous ongoing issues that BMW has failed to address. The problems include: A squealing and beeping noise coming from the engine. The headlights turning on by themselves. Interior lights turning on without warning. The vehicle shaking while driving. The check engine light repeatedly coming on. A recent gasoline smell that required me to take the vehicle to the shop due to safety concerns. The roof making a popping noise when driving over uneven driveways or surfaces. I have documented many of these issues with multiple videos. Despite providing evidence and repeatedly reporting these problems, BMW has ignored my concerns and has not adequately resolved the defects.

NHTSA complaint #11750438 — an unverified report by a vehicle owner.

ENGINE

There is an open safety recall for the engine starter on this vehicle. I contacted the local BMW dealer on 7/10/26 to have the recall fixed they advised me that they cannot address the recall because BMW North America has not sent the parts out for them to do so. I would like this on record in case there is any future damage to my vehicle due to the recall.

NHTSA complaint #11749613 — an unverified report by a vehicle owner.

ENGINE

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.

ENGINE

I bought my 2019 BMW X3 late 2025 before Christmas. The Carfax was fine and there were no open recalls on the vehicle. The vehicle had been serviced regularly at BMW facilities. Our family mechanic looked at the vehicle before I bought it and performed some basic diagnostics. The vehicle appeared fine. There were no error codes and all of the fluids were topped off. I don't know if the issues with the coolant were there before I purchased the vehicle or if they happened afterwards. There were no warning lights and everything looked good. This car is garage kept and is used a couple of times a week. I did my research on the internet and took my car in for an oil change at a highly-rated independent auto repair facility that specializes in European vehicles and are famous for providing dealership-level expertise, ASE-certified with factory trained technicians from Germany. On March 5th, 2026, when I went to pick up my car, they told me the bad news that is a well known manufacturer defect within the industry regarding these vehicles. They used plastic components in the engine compartment and in the cooling system, which makes the vehicles malfunction. From their report, with pictures, they state the following repairs need to be made, "During the vehicle inspection noticed active coolant leaks are present from multiple locations. The radiator plastic tank actively leaking coolant. The water pump change over valve leaking coolant. The turbocharger coolant line has a coolant crud build up . Oil filter housing and coolant flange on the cylinder block are discolored. For proper cooling system repair recommend complete update of the cooling system. Both balance shaft end caps leaking oil. Recommend replacement during cooling system update." They quoted me $8,914.86 for this repair. That's over HALF the value of the vehicle. They said the entire system needs to be replaced because ALL of the plastic parts in Florida's hot sun will fail. Sudden coolant failures in FL = DEATH.

NHTSA complaint #11748660 — an unverified report by a vehicle owner.

ENGINE

The contact owns a 2026 BMW X3. The contact stated that while vehicle was stopped at an intersection with the engine running, the message “Auto Start Feature Off” was displayed, and the starter was cycling unexpectedly. There was no warning light illuminated. The dealer was contacted but was unable to determine the cause of the failure. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 10.

NHTSA complaint #11747350 — an unverified report by a vehicle owner.

ENGINE

I own a 2020 BMW X3 M40i, VIN [XXX], manufactured November 2019, now at approximately 100,000 miles, equipped with the B58TU engine. My oil level sensor stopped completing measurements at approximately 45,000 miles, a known precursor to thermoplastic oil pump failure. For 55,000 miles I had no way to identify whether my vehicle contained the defective component because BMW removed the original thermoplastic part number from all dealer networks. VIN-based lookup now falsely returns updated metal component information regardless of what is physically present in the vehicle. This makes proactive identification impossible for both owners and dealers, meaning the defect cannot be remediated even by willing owners. I had no actionable path forward. On [XXX] I was driving on a Florida highway at 80 mph when a low oil pressure warning appeared. I pulled over immediately. A fault log pulled at 2:05PM showed code 1C3002. A second log pulled at 6:49PM after briefly running the engine showed three additional oil system faults including 1C2002 - engine oil pump pressure too low - indicating active progressive failure within hours. This failure occurred in 90 degree Florida summer heat, not cold weather. If NHTSA’s investigation is scoped around cold climate failures, my case demonstrates that scope is incomplete and the affected population is broader than currently documented. Carfax records confirm 18 total service records over 100,000+ miles, including 8 dealer visits between 18,000 and 50,000 miles under active CPO warranty. This vehicle has been consistently and properly maintained throughout its life. The vehicle became a safety hazard at highway speed without adequate warning. I will file a second complaint after physical inspection confirming which pump variant is actually present. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA complaint #11745794 — an unverified report by a vehicle owner.

ENGINE

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 #11744370 — an unverified report by a vehicle owner.

ENGINE

While driving under medium acceleration, vehicle made a loud popping noise and engine power was severely reduced. Drivetrain warning light immediately appeared and said vehicle could be driven but at reduced power and needed to be serviced soon as possible. At highway speeds on a major interstate, this created several close calls being struck by traffic while trying to reach a safe area on shoulder. On site inspection revealed the plastic turbo charge pipe had blown away from the throttle body. Pieces of plastic and metal were found in engine bay and under vehicle. Vehicle was driven to nearby residence and towed to closest suitable garage for more detailed assessment and repair. Facility confirmed the Air Duct, BMW part number 13717604033 had failed. Repair made costing approximately $825 US dollars.

NHTSA complaint #11743975 — an unverified report by a vehicle owner.

ENGINE

car starts emitting white smoke with plastic burning smell inside car and outside. no notifications on dash board before this happens therefore emitting this white smoke into car which we are subjected to inhaling further

NHTSA complaint #11741989 — an unverified report by a vehicle owner.

ENGINE

I am submitting this complaint regarding a serious mechanical and safety issue involving my 2019 BMW X3. On or around January 21, 2024, while driving from my home, a warning signal suddenly appeared on my dashboard related to the vehicle’s cooling system/engine. Due to safety concerns, I pulled into a nearby Wawa parking lot, which was the safest available place to stop at the time. I turned the vehicle off and waited approximately 15 minutes before carefully driving the vehicle back home. After inspection and diagnosis, I was informed that the vehicle required extensive repairs, including an engine replacement and cooling system repairs. At the time the coolant warning appeared, the replacement engine reportedly had approximately 59 miles on it. I believe a sudden engine or cooling system malfunction while operating a vehicle presents a serious safety concern for drivers, passengers, and others on the roadway. In addition, I experienced issues involving the shark fin antenna on the vehicle, which I understand may be connected to broader complaints involving BMW vehicles. I am requesting that NHTSA review this matter to determine whether these issues may indicate a broader defect or safety-related concern affecting other consumers. I am willing to provide supporting documentation including repair invoices, dealership records, photographs, and any additional information requested. Thank you for your attention to this matter and for your commitment to vehicle safety.

NHTSA complaint #11740824 — an unverified report by a vehicle owner.

ENGINE

Filing regarding NHTSA Recalls 25V-636 and 26V-056. My 2021 BMW X3 M40i (VIN: [XXX] , built September 2020) contains the recall-affected starter part number ending in 997 — confirmed by a BMW Level 1 certified technician — not the non-recall part number ending in 505. BMW denied coverage based solely on manufacture date, with no consideration of the actual components installed. My vehicle displays an active fire risk. On April 30, 2026, my dashboard displayed Engine cannot be started, Starter system fault. Call Roadside Assistance, and Repeat start attempt — all photographed and timestamped. Fault codes 216119, 35AE00, and 8040A9 were confirmed by diagnostic scan. BMW of Catonsville (Work Order XXX) attributed the fault to the battery and charged me $280.50. I replaced the battery with a BMW OEM unit on May 13, 2026 at a cost of $590.31. On May 21, 2026, the identical starter fault returned — conclusively disproving the battery diagnosis and confirming the starter as the root cause. BMW denied recall coverage by phone through BMW of Catonsville. No written denial was provided. I am requesting NHTSA investigate whether the recall scope incorrectly excludes vehicles built with the recall-affected starter component, compel BMW to expand coverage to include my VIN, replace my starter at no cost, and reimburse my out-of-pocket costs of $870.81. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA complaint #11740379 — an unverified report by a vehicle owner.

ENGINE

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.