2021 BMW 540I

The Office of Defects Investigation (ODI) received a petition on September 1, 2026 (dated August 5, 2026), requesting an investigation into an alleged defect in BMW rear differential assemblies. The petitioner alleges Model Year (MY) 2022 BMW 540i vehicles are experiencing a sudden mechanical failure that severs the drive connection between the driveshaft and the rear wheels. On August 12, 2026, BMW filed Safety Recall 26V525, which addresses the same condition raised in the petition. and covers certain 2022-2026 840i, 840i xDrive, 2021-2023 540i, 540i xDrive, M550i xDrive, and 2024-2026 750e xDrive vehicles.  This safety recall addresses potential wear in the connection between the rear driveshaft and rear differential, which could cause the connection to fail. The Vehicle Identification Number included in the petition falls within BMW’s recall scope and subject to BMW’s reimbursement program. Because Safety Recall 26V525 fully addresses the concerns raised in the petition, further investigation is unnecessary. Therefore, ODI is denying this Defect Petition and closing this action. The agency will continue to monitor the remedy and reserves the right to take any action if warranted by future circumstances. To review the ODI reports cited in the Closing Resume ODI report Identification Number document, go to NHTSA.gov.

NHTSA received a petition on or about July 18, 2022, requesting that Federal Motor Vehicle Safety Standard (FMVSS) 141 be applied to all electric and hybrid vehicles operating in the United States. The petition can be reviewed at NHTSA.gov under ODI Number 11486072. FMVSS 141 establishes performance requirements for pedestrian alert sounds for motor vehicles. The standard applies to hybrid and electric vehicles that have a gross vehicle weight rating of 4,536 KG or less or are defined as low-speed vehicles. The standard became fully applicable to all such vehicles manufactured on or after March 1, 2021.On January 27, 2023, NHTSA opened Defect Petition (DP) 22-005 to evaluate the subject matter described in the petition. On June 24, 2023 and as supplemented on June 25, 2023, the petitioner notified NHTSA he was withdrawing his petition. The petitioner indicated that, based on his review of data, there is no justification for asserting potential benefits that could be derived from actions sought by my petition. Based on the petitioner's withdrawal, DP22-005 is closed. Closure of this DP does not represent a determination by NHTSA regarding the subject matter of the petition.

What happened: I noticed a burning electrical smell and traced it to the 48V battery cable connection at the 48V battery under the cowl. The insulation was charred, bubbled and cracked, with bare copper exposed at the cable lug. The 48V system gave no warning light or sensor alert — the failure was found by smell only. On [XXX], after a short drive, the smell returned and the top of the 48V battery was hot to the touch; still no warning light or fault code appeared. What the dealer found: Arrowhead BMW of Glendale, Arizona (service advisor [XXX]) inspected the car on [XXX], under Repair Order [XXX]. The written inspection states: "CABLE IS MELTED FOR THE 48V BATTERY." Its prescribed correction is to replace the 48V battery and the negative battery cable, register the battery, and perform an extended test drive and reinspection. The dealer estimate is $6,330.08. The inspection notes no external cause for the melting. Why this matches a known defect: This is the failure mode in NHTSA recall 20V-761 — a 48V battery-to-starter-generator connection improperly assembled, causing increased electrical resistance, overheating, and fire risk — and in BMW service campaign B610525 (2025), which directs inspection of the five threaded 48V connections and renewal of the cable, nut, or battery where consequential damage is visible. My car was built [XXX], five weeks after that recall issued, and shows the identical failure, but the VIN shows no open recall. What BMW NA decided: BMW of North America denied goodwill assistance (case [XXX], case manager [XXX]). Its written decision email of [XXX] declines on one ground only: the 4-year/50,000-mile warranty expired [XXX]. It does not mention goodwill, recall 20V-761, campaign B610525, or any cause for the melting. On phone calls the same day, BMW NA said the damage was caused by "outside influence" but would not put that determination in writing. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ID

11775547

Incident

Nov 3, 2026

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)

NHTSA ID

11765993

Incident

Sep 2, 2026

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.

NHTSA ID

11749530

Incident

May 26, 2026

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.

NHTSA ID

11727007

Incident

Mar 22, 2026

Mileage

66,700 mi

In November 2025 my breaks quit working. I had AAA haul my car to a repair shop. They ran the codes on the car and found that it was related to a recall on 2021 BMW 540i's for the oil vacuum pump assembly, pan and gasket. I then had it towed to BMW and found out that my vin was not in the recall. BMW quoted me $4587 to repair this on a car with 45,000 miles. I then had it towed to a repair shop that replaced the oil vacuum pump assembly, oil pan, gasket and bolts for about $3700. I think that my vin should have been included in the recall. It was a obviously a common problem with my model and I should not have to pay this much on a car with 45,000 miles. I also had to pay $283.81 for BMW to diagnose it.

NHTSA ID

11717479

Incident

Nov 9, 2025

We notice the lose of braking power right after we started the car on 4/30 morning. The car was totally fine before that. took it to the BMW dealer they said the problem is "Vacuum/oil pump failing internally. fault for brake booster pressure switch, no brake boost" I find that there is a recall for the exact problem but it doesn't include my vehicle The "Part 573 Safety Recall Report 21V-598" stated that when It does happen it will cause damage to the oil/vacuum pump. I think recall 21V-598 should include my vehicle

NHTSA ID

11658906

Incident

Apr 30, 2025

Unintended car acceleration, with complete brake failure. No software warning icons in dash, no collision avoidance or ABS triggered even though car so equipped. Crashed into rear end of stationery vehicle,. [XXX] , MN police were called. Incident report # attached. (1st image) Western National Insurance Co. notified.Claim # attached (2nd image) Car will be inspected @ BMW dealership in Bloomington, MN 7/25/23. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ID

11533979

Incident

Jul 22, 2023

The contact owns a 2021 BMW 540I. The contact stated that on multiple occasions, the front and rear passenger’s and driver’s side seat belts failed to detach after being connected. The contact stated that he forced the rear passenger’s side seat belt to detach with a screwdriver. No warning lights was illuminated. The vehicle was taken to the dealer where the dealer stated that candy was lodged in the buckle. The contact stated that the vehicle was not diagnosed or repaired. The manufacturer was notified of the failure and a case was opened. The failure mileage was approximately 10,000.

NHTSA ID

11490291

Incident

Oct 7, 2022

Mileage

10,000 mi

The EVAP systems purge (vent) valve limited warranty for defects in materials or workmanship has been extended to 15 years / 150,000 miles as determined from the original in-service date.

One or more of the LED daytime running lights are dim or discolored.

Check Control message (CCM) indicates: (ID 213): Stop, exercising due care. Voltage supply The Service Engine Soon light is on with the following DME Fault Code: 21B209 - Starter alternator / belt for 48V system (OSA_RIEMEN_RISS): Belt betweenCombustion engine and starter generator torn And/or one or more of the following other issues are also occurring: Noise in the area of the belt drive. Odor from the engine compartment. Smoke formation in the area of the belt drive. Drive belt damaged or prematurely worn. Torn drive belt.

The basic conditions for initializing the power windows are not met.

The electrical system of BMW vehicles has been subject to an ongoing development process over the last few years. This has led to increased demands being placed on the battery. This document covers important information for the dealer on how to handle “discharged battery” complaints.

At low outside temperatures (below 40 degrees F) and slow driving speeds (i.e. when parking, maneuvering)with a large steering angle, the front end can be slightly axially misaligned. This can be felt (jerking)/ heard via an acoustic acknowledgement (clunk) as seen at the 11 second mark of the video. See attached video V36 01 21.