2021 BMW M5 Problems
Owner-reported complaints filed with NHTSA, grouped by component
Data refreshed
What this page shows
Everything below is an owner-reported complaint submitted to NHTSA about the 2021 BMW M5, grouped by the component NHTSA recorded on the report. These are not confirmed defects, and they are not recalls. NHTSA does not verify most reports before publishing them, and a category with more reports in it is not evidence that a part is defective.
Complaints are reports submitted by owners and drivers to NHTSA. They are not verified and do not establish that a defect exists.
Reports by component
Ranked by how many owner reports name each component category
- Electrical120.0%
- Engine120.0%
- Fuel system120.0%
- Exterior lighting120.0%
- Powertrain (other)120.0%
Percentages are of component mentions. A single complaint can name more than one component, so these do not sum to the total complaint count.
Each component in detail
What the reports in each category say, in the owners' own words
Electrical
Reports naming the electrical system — wiring, battery, charging, control modules, infotainment and electrical accessories.
From owner reports, verbatim
Car catch on fire and explode it with 2 ocupantes inside
Too few reports in this category for a page of its own — they appear in the full complaint list.
Engine
Reports naming the engine itself — including stalling, misfires, oil consumption, cooling and internal engine components.
From owner reports, verbatim
BMW Federal Emissions Recall Campaign - Delivery Stop: Replace Coolant Expansion Tank [B170324] The manufacturer's recall remedy replaces a defective, heat-compromised plastic coolant reservoir with an identical plastic component that is subject to the exact same thermal fatigue and catastrophic failure. I had the dealer replace the tank in March 2024 under this recall. This week, however, I noted coolant residue from the horizontal seam of the expansion tank. Furthermore, the dealership's primary diagnostic criteria (a cold pressure test) FAILED to detect severe, ongoing coolant leakage that was actively drowning the fuel injectors, nearly resulting in catastrophic engine failure. I demanded the bulletin be followed by removing the expansion tank based on the visual evidence alone. I further demanded bore scope photos as stated in the recall bulletin. These support the above claims that ALL FOUR injectors are contaminated with gross amounts of coolant which could have led to a catastrophic engine failure. BMW replaced my expansion tank in 2024 when I first bought the car with 13k miles on it with a tank that suffers from exactly the same design flaw. It is therefore no fix at all and all of these cars are all ticking time bombs unless a permanent solution is mandated.
Too few reports in this category for a page of its own — they appear in the full complaint list.
Fuel system
Reports naming fuel storage or delivery — tanks, pumps, lines, injectors and fuel leaks.
From owner reports, verbatim
Car catch on fire and explode it with 2 ocupantes inside
Too few reports in this category for a page of its own — they appear in the full complaint list.
Exterior lighting
Reports naming headlights, tail lights, turn signals and other exterior lighting.
From owner reports, verbatim
THE REVERSE BACKUP LIGHTS AND CAMERA IMAGE IS SO DIM AND LIMITED AS BE UNUSABLE AND VERY UNSAFE WHEN BACKING UP AT NIGHT IN DARKNESS. DEALER SERVICE COULD NOT FIX AS DESIGNED IN! I BELIEVE SAME SYSTEM USED ON ALL 2021 SERIES 5 CARS. LEFT CAR AT DEALER WITH FOBS AS I AM REFUSING THE CAR CANCELLING SALE AS HIDDEN DEFECT UNSAFE AND NOT FIXABLE PER DEALER SERVICE MGR. ATTACHED PHOTOS ARE ACTUALLY BRIGHTER THAN WHAT DRIVER SEES. VIEW IS FROM MY GARAGE AND DRIVEWAY TO BACKUP. RED TINT IS BREAK LIGHTS STRONGER THAN WEAK BACKUP LIGHTS ALL VERY ABNORMALLY DIM WITH VERY RESTRICTED ILLUMINATED VIEW.
Too few reports in this category for a page of its own — they appear in the full complaint list.
Powertrain (other)
Powertrain reports that are not specifically the engine or transmission — driveshafts, axles, transfer cases and differentials.
From owner reports, verbatim
Car catch on fire and explode it with 2 ocupantes inside
Too few reports in this category for a page of its own — they appear in the full complaint list.
Higher-selling and older vehicles accumulate more reports. Counts are not failure rates and are not directly comparable between vehicles that sold in very different numbers.
Elsewhere on this vehicle
Data sources
- NHTSA Office of Defects Investigation — owner-reported complaints and the components recorded on them
Data on this page last refreshed .