Most common 2018 BMW M550I problems
Share of the 23 complaints; one complaint can involve more than one system. "~" is the median mileage when the problem started.
BMW M550I complaints by model year
Best M550I years: 2021. Compare all years →
2018 BMW M550I recalls (1)
Back over prevention › Sensing system › Camera
BMW of North America, LLC (BMW) is recalling certain 2018 540d, 2018-2020 530i, 530i xDrive, 540i, 540i xDrive, M550i xDrive, M5, 530e, 530e xDrive, X3 sDrive, X3 xDrive, X3 M40i, X3 M, and 2019-2020 X4 xDrive, X4 M40i, X4 M, X7 xDrive, X7 M50i, 740Li, 740Li xDrive, 750Li, 750Li xDrive, 8 Series Convertible and Coupe 840i, 840i…
Remedy: BMW will notify owners, and dealers will update the back-up camera software, free of charge. The recall began November 8, 2019. Owners may contact BMW customer service at 1-800-525-7417 or Rolls-Royce at 1-877-877-3735.
What 2018 BMW M550I owners say
Air bags
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.
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: [redacted]
Seat belts
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: [redacted]
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.
Electrical system
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.
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.
2018 BMW M550I engines & fuel economy
| Engine | Transmission | Drive | MPG city / hwy / combined |
|---|---|---|---|
| 4.4L 8-cyl turbo | 8-speed automatic | AWD | 16 / 25 / 19 |
EPA ratings. Class: Midsize car.
Frequently asked questions
Is the 2018 BMW M550I a good car?
There isn't enough complaint history for the M550I to compare model years reliably. So far owners have filed 23 complaints with NHTSA.
What is the most common problem with the 2018 BMW M550I?
The air bags — 10 complaints, 43% of all complaints for this model year, most often about sensor › occupant classification. Next are the seat belts (6) and electrical system (4).
How many recalls does the 2018 BMW M550I have?
There is 1 recall for the 2018 BMW M550I, the most recent from September 27, 2019 (camera). Recall repairs are free at any authorized dealer — check whether yours has been done with the VIN recall check.
What are the best and worst years of the BMW M550I?
The best years by complaints, compared at the same age, are 2021. See the full BMW M550I years comparison.
At what mileage do 2018 BMW M550I problems happen?
The median mileage reported in complaints is about 26,000 miles; 100% of problems with a recorded mileage started before 50,000 miles.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.