The Supplemental Restraint Systems (SRS) Front Passenger’s Seat Occupancy Capacitive Interior Sensor (CIS) Mat for defects in materials and/or workmanship that causes a false seat occupancy alert to occur has been extended to 10 years / 120,000 miles as determined from the vehicle's original in-service / first delivery date.
full bulletin at NHTSA ↗2018 BMW M550i airbags problems
moderate Owners of the 2018 BMW M550i have filed 9 NHTSA complaints about the airbags at roughly $1,100 to repair (U.S. federal records, as of July 2026). Source: NHTSA Office of Defects Investigation. See airbags across all vehicles →
Complaints
9
Recalls
0
Avg fix
$1,100
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering airbags on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
According to the customer, the airbag warning light was on, but it may not be illuminated when the vehicle arrives in the workshop. 1. ACSM fault code "930A60 - Seat occupancy detection, front passenger; malfunction" is stored. The fault may or may not currently be present. Or 2. ACSM fault code "930A1C - Front passenger seat occupancy detection transmitting fault(moisture)" is stored. The fault may or may not currently be present.
full bulletin at NHTSA ↗REAR LIGHT FAULTY CHECK CONTROL MESSAGE: The CID displays "Left brake light faulty.
full bulletin at NHTSA ↗FRONT GRILLE UPPER/LOWER ACTIVE AIR FLAPS - LTD WTY EXT TO 15 YEARS/150000: A check engine light or check control message is present for the active air flaps behind the kidney grilles. The potential component-related causes of these faults are a: 1. Mechanical issue with the linkage of the upper or lower active air flap; and/or an 2. Internal short circuit of the adjustment motor.
full bulletin at NHTSA ↗TAILGATE UNINTENTIONALLY OPENS: This Service Information Bulletin (Revision 4) replaces SI B51 30 16 dated March 2018. Trunk/tailgate may open when vehicle is locked Trunk/tailgate may open while the vehicle is in motion usually after stopping such as a traffic light etc. Vehicle key trunk/tailgate button may be accidentally pressed thus opening the tailgate.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
What owners are reporting 8 most recent
Passenger restrained seatbelt signal. There is bulletin in google: SIB 72 04 17. There are recalls for this vehicle but dealer want accept it.
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…
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.
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.
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…
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.
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.
Passenger restrain system mail function
Had airbags trouble with your 2018 BMW M550i?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the airbags problem on the 2018 BMW M550i?
It's a documented issue but not catastrophic. 9 complaints have been filed. Repairs average $1,100 and most owners catch it before it causes a breakdown.
At what mileage does the airbags typically fail?
Mileage data is limited for this issue. Owners report failures across a wide range, suggesting cause is more about driving conditions and maintenance than mileage alone.
What does it cost to fix?
Independent shops typically charge around $1,100 for airbags repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to airbags?
No active recalls currently cover airbags issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2018/BMW/M550i.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.