2018 BMW M550I Owner Complaints

Throughout my ownership, I have adhered to BMW’s recommended maintenance schedule, including routine oil changes and inspections. At no point was I advised of any engine issues, oil leaks, or conditions that could potentially lead to catastrophic engine failure. Most recently, the vehicle had change oil svc. at BMW of White Plains on June 25, 2026, at 69,456 miles. On July 17, 2026, while driving on the Bronx River Parkway, I unexpectedly noticed signs indicating that the vehicle was leaking oil. I was approximately three miles from BMW of White Plains and proceeded directly to the dealership. Before reaching the dealership, the engine lost power and ultimately failed. A few days later, I was informed by my BMW Service Advisor that the engine had sustained catastrophic internal damage and would require the replacement of the short block. The estimated repair cost exceeds $50,000. After six years of ownership, approximately 50,000 miles driven, and consistent maintenance performed by authorized BMW service centers, I find it extremely concerning that the engine could experience such a sudden, catastrophic failure without any prior warning or documented indication of an oil leak or impending engine issues. Most importantly, I believe this incident posed a significant safety hazard. The engine lost power while I was driving on a busy parkway, causing my vehicle to slow down and stall in traffic. Additionally, the active oil leak raised concerns about the potential risk of fire. A sudden loss of propulsion on a high-speed roadway put both myself and surrounding motorists at considerable risk.I respectfully request that the National Highway Traffic Safety Administration investigate whether this type of failure indicates a broader safety issue involving the N63 engine or related components. If similar incidents have occurred, I believe owners should be informed so they can take appropriate precautions before experiencing a potentially dangerous loss of power.

NHTSA ID

11755556

Incident

Jul 17, 2026

To: National Highway Traffic Safety Administration (NHTSA) Subject: Safety Complaint – 2018 BMW M550i Driver Assistance System I am filing a formal safety complaint regarding a dangerous malfunction of the driver assistance systems in my 2018 BMW M550i. These systems behave unpredictably and cannot be reliably disabled, creating an unsafe driving condition. The vehicle’s driver assistance features (including steering and braking interventions) activate or restrict themselves unexpectedly while driving, sometimes without clear warnings. At other times, the system disables itself mid-drive. Despite repeated attempts, these features cannot be fully turned off, leaving me forced to rely on a computer system that makes erratic decisions affecting vehicle control. BMW dealerships acknowledge the issue but state no permanent fix exists unless I pay out of pocket. BMW corporate has declined goodwill repairs and claims the behavior is “normal,” despite the clear safety implications. I believe I should not be required to pay to correct a defect that impacts safe operation of the vehicle. This issue is especially concerning given prior BMW recalls involving driver assistance and steering sensor systems. An unpredictable or uncontrollable ADAS system undermines driver authority and increases crash risk. I am requesting that NHTSA investigate this issue to determine whether it represents a broader safety defect and require BMW to provide a full repair at no cost. If the defect cannot be reliably repaired, I believe a buyback or vehicle replacement should be considered. This vehicle does not operate in a consistently safe manner, and I fear continued use places me and others at risk. Thank you for your attention to this serious safety concern.

NHTSA ID

11711486

Incident

Aug 11, 2025

I’m getting a passenger restraint system malfunction message on my infotainment. Says: “Passenger restraint system limited. Increased risk of injury in case of a collision. Continue wearing safety belt.” This is the second time this has occurred on this specific vehicle. First time was in 2021 and was repaired. Now it came up again.

NHTSA ID

11680940

Incident

Aug 14, 2025

Passenger restrain system mail function

NHTSA ID

11655700

Incident

Apr 4, 2022

Passenger restrained seatbelt signal. There is bulletin in google: SIB 72 04 17. There are recalls for this vehicle but dealer want accept it.

NHTSA ID

11621999

Incident

Sep 1, 2024

In the last 8 months, I have experienced 3 blowouts on the same side of the car. The tires were Continental Procontact SSR 245/40R19. In each instance, the sidewall failed and blew out. This has occurred on the highway as well as at low city speeds.

NHTSA ID

11621119

Incident

Sep 3, 2024

Excessive amounts of water accumulated at interior floors from the A/C drain unit. Water damage to all sensors and bad odor. Worried car may catch fire while driving. A/C will sometimes work.

NHTSA ID

11610156

Incident

Aug 16, 2022

The rear driver door does not open from the outside or inside of the vehicle. I had someone sitting behind the driver and they could not exit the vehicle, we had to assist so they can exit out the other side (passenger rear door). The handle on the outside of the car seems like if it is not connected to the door mechanism. This is a huge safety issue. I also took the car to the dealer to have the door covered under my extended warranty and they did not cover it under warranty.

NHTSA ID

11605826

Incident

Jun 18, 2024

The rear driver door will not open. It seems the door handle does not open the door from the exterior of the vehicle. The door will also not open from the interior of the vehicle. It feels like the handle has come lose from the door latch mechanism to open the door of the vehicle. This is a big safety concern if there is a passenger sitting behind the driver and they cannot exit the vehicle.

NHTSA ID

11605824

Incident

Jun 18, 2024

Vehicle reported a Passenger Restraint Failure intermittently and upon getting diagnosed is related to a faulty seat occupancy sensor. If this sensor can fail ~4yrs of ownership with < 30k miles driven and it is critical to passenger restraint, it would seem that this should be fixed by BMW. With quick search, the problem doesn't seem isolated: [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ID

11597615

Incident

Jun 29, 2024

Passenger restraint system malfunction. I took it to the dealership and was told it will cost $3785.91 to replace the passenger seat mat. Looking online, this problem appears to be widespread with many individual car owners complaining of the issue. Given that this is a life safety system and its apparent prevalence, it seems appropriate to consider this for a mandatory recall.

NHTSA ID

11591343

Incident

May 29, 2024

The passenger seat occupancy mat is faulty - same as in many other BMW models for which BMW has issued a 15 year warranty. The car chimes and states "fasten safety belt" for the passenger seat when the passenger seat is entirely empty. This error comes and goes, and stops when the belt is buckled.

NHTSA ID

11586141

Incident

Apr 29, 2024

The passenger restraint malfunction continues to alarm and the dealership states that it is a seat-pad sensor and want over $2000.00 to replace. From a number of BMW forums, it appears that this was a common problem with earlier models and a subsequent 15-year warranty extension was granted because of the safety concerns. My car is well cared for and has very few miles on it, so I truly believe that BMW needs to either recall this faulty SAFETY component or replace it free of charge. Please protect me and my family by holding BMW accountable.

NHTSA ID

11550749

Incident

Oct 12, 2023

Passenger Restraint Warning Light has been coming on off and on and now stays on all the time. Dealer has confirmed car needs to have the OC3 mat replaced at a very high price. Car is a 2018 BMW M550ix. Apparently this has been a common problem with the BMWs.

NHTSA ID

11543378

Incident

Sep 5, 2023

Passenger side sensor is faulty. BMW has issued Technical Service Bulletin to repair when found in warranty. The sensor will errantly warn airbag disable when person is not in seat.

NHTSA ID

11540031

Incident

Aug 20, 2023

My old 5 series 2017 had this same problem, now my 2018 m550i has the airbag problem. A warning light for no reason pops up saying “passenger restraint system malfunction” and turns off the passengers airbag, BMW will not fix it out of warranty and charges 3,000$. Many people are driving around without airbags in a new car because of this.

NHTSA ID

11503861

Incident

Jan 26, 2023

On vacation road trip driving for about 3 hours. Instrument cluster completely shuts off and goes to black. Screen, vehit speed and rpm and all adas systems stop working. Sometimes turning the car off and on will address the issue other times it will constantly restart the instrument cluster when driving.

NHTSA ID

11495027

Incident

Nov 26, 2022

Sunroof on 2018 BMW M550i "exploded" while driving home from work. Weather was cloudy, light rain in the 50's, late March in northern California, USA. Sunroof was in closed position and cars HVAC was not being used to create temperature or pressure difference. Heated seat was being used. Had been parked outdoors under an awning during the day and had been on the road for less than 15 minutes. The automobile will be taken to the nearest dealership in the morning. Pictures were taken. Significant safety risk to occupants if glass shatters when the "slider" is in the open position.

NHTSA ID

11458748

Incident

Mar 28, 2022

I WAS DRIVING ON THE HIGHWAY AND THE SUNROOF EXPLODED OUT OF NO WHERE, BMW SAID A ROCK HIT IT OR SOMETHING BUT I AM 90% SURE A ROCK DIDN'T HIT IT. DID NOT SEE ANYTHING FLY UP TOWARDS THE CAR. IT SOUNDED LIKE A GUNSHOT WENT OFF IN THE CAR AND GLASS SHOWERING ALL OVER YOU BECAUSE I HAD THE SHADE OPEN. LUCKILY IT DID NOT GET INTO MY EYES TO CAUSE ANOTHER ACCIDENT. GLASS SHATTERED UPWARDS AND FROM DOING RESEARCH IT LOOKS LIKE IT'S A COMMON PROBLEM

NHTSA ID

11353442

Incident

Aug 21, 2020

Mileage

18,750 mi

DUE TO WEATHER CHANGE THE SUNROOF CAN SHATTER. THIS COULD HAD INJURED TO PASSENGER AND INFANTS IN CAR. BMW TAKES NO RESPONSIBILITY ON FIXING IT

NHTSA ID

11350167

Incident

Jul 3, 2020

Mileage

34,000 mi

? THIS IS MY FOURTH CAR(BMW) BECAUSE I BIG FUN OF IT. HOPING FOR YOUR KIND CONSIDERATION. THANKS,

NHTSA ID

11268330

Incident

Oct 13, 2019

Mileage

26,000 mi

VEHICLE WAS DRIVING AT MODERATE SPEED AND HIT A SMALL POT HOLE CREATING A 3 INCH CUT WHERE TIRE AND RIM LIP MEETS. DAMAGE TO TIRE WAS NOT NOTICEABLE UNTIL ONE DAY LATER WHEN TIRE WAS DEFLATED. THIS COULD HAVE CAUSED POTENTIAL DANGER TO DRIVER,PASSANGER AND TO OTHER ONCOMING VEHICLES.

NHTSA ID

11219693

Incident

May 31, 2019

Mileage

20,000 mi

ON 4/10/2018 VEHICLE WAS PARKED CAUGHT FIRE TOTTAL LOSE

NHTSA ID

11089242

Incident

Apr 10, 2018