2021 Bmw M5
The Verdict
The 2021 Bmw M5 has 3 owner complaints filed with NHTSA. The most reported issues are engine (2 complaints) and electrical (1 complaints). With a Klunk Score of 100/100, it earns a "Smooth Ride" rating. If you're shopping for a Bmw M5, consider the 2010 model year which has 66% fewer complaints.
Safe Bet
The 2010 has 66% fewer complaints
View the 2010 Bmw M5 dashboard →
Klunk Score: Smooth Ride
This vehicle year has significantly fewer complaints than average. A reliable choice.
How is this calculated?
The Klunk Score ranks this vehicle year against all others in our database based on total owner complaints filed with NHTSA. 100 = fewest complaints (top tier), 0 = most complained-about. Scores above 60 are better than average; below 40 means more problems than most.
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Under the Hood
Each number is a complaint. Darker = bigger problem.
By Category
By Severity
Worst Problems
Complaints
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.
Car catch on fire and explode it with 2 ocupantes inside
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.