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 the federal safety agency 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)
The worst 2021 BMW 540I problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
- Brakes3
- Electrical3
- Transmission3
- Driver assistance1
- Engine1
Problems by type
Tap a problem to see which part fails, at what mileage and in which other years.
- Brakes3
- Electrical3
- Transmission3
- Driver assistance1
- Engine1
- Seat belts1
- Steering1
- Wheels1
Recalls 6
Power train: driveline: driveshaft
- What is wrong
- BMW of North America, LLC (BMW) is recalling certain 2020-2026 840i, 840i xDrive, 2021-2023 540i, 540i xDrive, M550i xDrive, and 2024-2026 750e xDrive vehicles. The connection between the driveshaft and the rear differential may become damaged, possibly resulting in a loss of power to the rear wheels or a vehicle rollaway.
- Risk
- An unexpected loss of drive power can increase the risk of a crash. In addition, a damaged driveshaft can result in a vehicle rollaway if the parking brake is not applied, increasing the risk of a crash or injury.
- Remedy
- Dealers will inspect the connection between the driveshaft and rear axle differential, and apply adhesive or replace the driveshaft and rear axle differential, as necessary, free of charge. Owner notification letters were mailed October 8, 2026. Owners may contact BMW customer service at 1‑800‑525‑7417. Vehicle Identification Numbers (VINs) involved in this recall will become searchable on beginning October 2, 2026.
Recall number 26V525000 · Recall details
Seat belts
- What is wrong
- BMW of North America, LLC (BMW) is recalling certain 2021 2 Series (230i, 230i xDrive, M240i, M240i xDrive), 330e, 330e Xdrive, 4 Series Coupe (430i, 430i xDrive, M440i xDrive) M4 Coupe, M4 Competition Coupe, BMW 4 Series Convertible (430i, M440i), BMW X1 sDrive28i, xDrive28i, 2 Series Gran Coupe (228i, 228i xDrive, M235i xDrive), M2 Competition Coupe, 330i, 330i xDrive, M340i, M340i xDrive, M3, M3 Competition, 530i, 530i xDrive, 540i, 540i xDrive, MINI Hardtop 2 Door (Cooper, CooperS, JCW), X2 sDrive28i, X2 xDrive28i, X2 M35i, Z4 sDrive30i, Z4 M40i, MINI Hardtop 2 Door (Cooper SE), MINI Convertible (Cooper, Cooper S, JCW), MINI Clubman (Cooper S, Cooper S All4, JCW), MINI Countryman (Cooper, Cooper All4, Cooper S, Cooper S All4, JCW All4), Rolls Royce Ghost, MINI Countryman (Cooper S E All4), Rolls Royce Phantom, Rolls Royce Cullinan, and Toyota Supra vehicles. The passenger seat belt Automatic Locking Retractor (ALR) may deactivate early, before the webbing fully retracts. As such, these assemblies fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 208, "Occupant Crash Protection."
- Risk
- During a crash, a seat belt retractor that does not function as intended increases the risk of injury.
- Remedy
- Dealers will inspect the seat belt retractors (including the seat belts) and, if necessary, replace the retractors, free of charge. Owner notification letters were mailed on September 3, 2021. Owners may contact BMW customer service at 1‑800‑525‑7417; 1‑866‑825‑1525 (MINI); 1‑877‑877‑3735 (Rolls Royce); and 1‑888‑270‑9371 (Toyota).
Recall number 21V554000 · Recall details
Back over prevention: software
- What is wrong
- BMW of North America, LLC (BMW) is recalling certain 2019-2021 X3 sDrive30i, X3 xDrive30i, X3 M40i, X3M, X4 xDrive30i, X4 M40i, M550i, X4M, X5 sDrive40i, X5 xDrive40i, X5 xDrive50i, X5M, X5 M50i, X7 xDrive40i, X7 xDrive50i, X7 M50i, Alpina XB7, 330i, 330i xDrive, M340i, M340i xDrive, and 8 Series Coupe, Convertible and Grand Coupe, 840i, 840i xDrive, M850i xDrive, M8, 2020-2021 530e, 530e xDrive, 330e, 330e xDrive, 745Le, 745Le xDrive, X5 xDrive45e, X3 xDrive30e, X6 sDrive40i, X6 xDrive40i, X6 xDrive50i, X6 M50i, X6M, 530i, 530i xDrive, 540i, 540i xDrive, M550i xDrive, M5, 740i, 740Li, 740Li xDrive, M760i Drive, M760Li xDrive, 750Li xDrive Alpina, Alpina B7 xDrive, and 2021 4 Series Coupe 430i, 430i xDrive, M440i xDrive vehicles. When shifting into Reverse, a small portion of the rearview image may be obscured, or the screen may not illuminate. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 111, "Rear Visibility."
- Risk
- If the driver relies on only the rearview camera image, the missing or reduced rearview image view can increase the risk of a crash or injury.
- Remedy
- BMW will notify owners, and dealers will inspect the rearview camera software and update it if necessary, free of charge. The recall began April 16, 2021. Owners may contact BMW customer service at 1‑800‑525‑7417.
Recall number 21V096000 · Recall details
Power train: driveline: driveshaft
- What is wrong
- BMW of North America, LLC (BMW) is recalling certain 2020-2021 530i xDrive, 540i xDrive and 2021 740Li xDrive vehicles. The output shafts (left/right) which transfer power from the driveshaft to the rear wheels may break due to a heat treatment error during supplier production.
- Risk
- A broken output shaft can lead to a loss of drive power or a rollaway condition in a parked vehicle (if the parking brake is not engaged), increasing the risk of a crash.
- Remedy
- BMW will notify owners, and dealers will replace the output shaft(s), free of charge. The recall began March 24, 2021. Owners may contact BMW customer service at 1‑800‑525‑7417.
Recall number 21V046000 · Recall details
Electrical system: 12v/24v/48v battery
- What is wrong
- BMW of North America, LLC (BMW) is recalling certain 2021 M340i xDrive, M440i xDrive Coupe, 530i, 530i xDrive, 540i, 540i xDrive, 740Li, 740Li xDrive, 840i Gran Coupe, 840i xDrive Gran Coupe, X5 sDrive40i, X5 xDrive40i, X6 sDrive40i, X6 xDrive40i, and X7 xDrive40i vehicles. The connection between the 48-Volt battery and the starter-generator may not have been assembled properly, which can cause increased electrical resistance at the connections.
- Risk
- Increased electrical resistance can increase the risk of a fire.
- Remedy
- BMW will notify owners, and dealers will inspect the connection between the 48-Volt battery and the starter-generator assembly, replacing it if necessary, free of charge. The recall is expected to begin April 12, 2021. Owners may contact BMW customer service at 1‑800‑525‑7417.
Recall number 20V761000 · Recall details
Back over prevention: sensing system: camera
- What is wrong
- BMW of North America, LLC (BMW) is recalling certain 2020-2021 X3 sDrive 30i, X3 xDrive 30i, X3M 40i, X3 xDrive 30e, X4 xDrive 30i, X4M 40i, 530i, 540i, 540i xDrive, M550i xDrive, M5, 550e, 550e xDrive, and 550e iPerformance vehicles. A small portion of the rearview image may be slightly obscured. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 111, "Rear Visibility."
- Risk
- If the driver relies on only the rearview camera image, the reduced rearview image view can increase the risk of a crash or injury.
- Remedy
- BMW will notify owners, and dealers will inspect and, if necessary, program the rearview camera with updated software. The recall began November 18, 2020. Owners may contact BMW customer service at 1‑800‑525‑7417.
Recall number 20V598000 · Recall details
See all 6 recalls for the 2021 BMW 540I
Defect investigations
Driveshaft to rear differential connection failure
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 BMWâs recall scope and subject to BMWâs 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
DP26009
Pedestrian alert sounds
the federal safety agency 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 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, the federal safety agency 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 the federal safety agency 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 the federal safety agency regarding the subject matter of the petition.
DP22005
Technical service bulletins for the 2021 BMW 540I 167
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- The EVAP systems purge (vent) valve limited warranty for defects in materials or workmanship has been...
- One or more of the LED daytime running lights are dim or discolored.
- Check Control message (CCM) indicates: (ID 213): Stop, exercising due care
- 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...
- At low outside temperatures (below 40 degrees F) and slow driving speeds (i.e. when parking,...
- The Central Information Display goes black intermittently due to resets of the Head Unit (HU-H3)....
- Situation
- Engine will crank but not start
- Customers may state that the alarm system (DWA) is not active after locking their unoccupied vehicle
2021 BMW 540I fuel economy
Official EPA estimates in miles per gallon (MPGe for electric). Ranges cover trims that share the same engine.
| Engine | Drive | City | Highway | Combined |
|---|---|---|---|---|
| 3.0L 6‑cyl Hybrid | RWD | 25 | 32 | 27 |
What 2021 BMW 540I owners say
Most recent owner complaints, unedited.
In August 2026, the federal safety agency 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 the federal safety agency 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 federal safety agency Hotline to report the failure. The failure mileage was approximately 66,700.
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.
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
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)
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.
Intermittent vibration at highway speeds. Brought to the BMW dealership and they stated the right front wheel was out of round. I never hit a pothole or anything that would cause damage. The dealer "repaired" the wheel, but the problem still exists. Brought the vehicle back and am now told that BMW has started offering non-run flat tires on new cars. I feel that the run flat tires coupled with the low-profile wheels could be the issue. Also, feel that the wheels are poorly made and are prone to being warped.
2021 bmw 540i. Consumer writes in regards to multiple defects due to battery management issue. The consumer stated the vehicle has experienced mulitple occasions of failures with the breaking system. The driver had to press the pedal to the floor in order to stop the vehicle. The emergency braking system engaged without warning, the autostart engaged independtly, and lighting/speaker/sunroof malfunction.
Compare the 2021 BMW 540I
Other model years
199419951997199819992000200120022003201720182019202020212022202320242025
Questions about the 2021 BMW 540I
Is the 2021 BMW 540I reliable?
Owners have filed 10 complaints about the 2021 BMW 540I, fewer than a typical 540I model year.
What is the 2021 BMW 540I year score?
The 2021 BMW 540I scores 75 out of 100 (average). The score compares it with the other model years of the BMW 540I: 75 is a typical year, 50 means twice the usual complaints, and serious complaints and recalls lower it.
What is the most common problem with the 2021 BMW 540I?
Brakes, with 3 complaints. Next is electrical (3).
How many recalls does the 2021 BMW 540I have?
6 recalls, covering power train, seat belts and back over prevention.
What gas mileage does the 2021 BMW 540I get?
Official estimates for the 2021 BMW 540I range from 27 mpg combined. The most efficient version (3.0L 6-cyl hybrid, RWD) gets 25 city and 32 highway.
VIN decoder
See the problems and recalls for an exact car
Buying a used 2021 BMW 540I?
Check the exact car before you pay: accidents, salvage or flood titles, odometer readings and previous owners.
Check its history