Table 1 shows one common power train related problems of the 2021 BMW 540.
| Problem Category | Number of Problems |
|---|---|
| Power Train problems |
In August 2026, the national highway traffic safety administration announced an active safety recall under campaign number 26v525000 for certain 2021–2023 BMW vehicles experiencing severe driveshaft-to-rear-differential connection failures that result in an immediate loss of motive power and vehicle rollaway risks. Shortly after this announcement, my 2021 BMW 540i (VIN: [xxx]) suffered this exact catastrophic mechanical failure while in motion, completely disabling the vehicle and creating an imminent safety hazard in live traffic. The vehicle was towed directly to bert smith BMW in st. Petersburg, florida, where a certified technician formally diagnosed the severed components and ordered a replacement driveshaft assembly. Despite the vehicle exhibiting the identical mechanical failure mechanism and falling squarely within the impacted model year production pool under federal investigation, BMW corporate denied all warranty coverage and goodwill assistance on the basis that this specific VIN was not yet explicitly listed in the initial recall batch. As a direct result of the manufacturer's denial, I was forced to pay entirely out of pocket for the mandatory parts and labor to restore the vehicle to a safe operating condition. The failed physical components have been requested for preservation, and this documented financial injury has been submitted alongside a formal safety complaint to federal investigators to mandate a retroactive expansion of the recall parameters for full financial reimbursement. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).
Starter engine failure. Car failed to start multiple times. Major safety hazard that can cause a short circuit, melt wiring harnesses, and spark an engine bay fire posing an immediate threat to life. Problem was inspected and confirmed by a dealer. Multiple waring lamps and messages appeared. Dealer report stated: starter motor faulty. Engine electrical system concern: c/s: repeat start attempt intermitten warning lights. Please issue recall for the safety of all drivers.
The contact owns a 2021 BMW 540i. The contact stated that while driving at an undisclosed speed, the accelerator pedal was depressed; however, the vehicle failed to accelerate as intended. There was an abnormal sound coming from the vehicle before the vehicle lost motive power. No warning lights were illuminated. The contact stated that the vehicle failed to respond while in drive(d) or reverse(r). The vehicle was towed to the dealer, where it was diagnosed with a driveshaft failure. The contact was informed that the driveshaft needed to be replaced. The vehicle was not repaired. The contact referenced NHTSA campaign number: 21v046000 (power train); however, the VIN was not associated with the recall. The manufacturer was made aware of the failure. The contact was advised to contact the NHTSA hotline to report the failure. The failure mileage was approximately 66,700.