The problem
BMW of North America, LLC (BMW) is recalling certain 2020 M340i, M340i xDrive, 540i, 540i xDrive, X3 M40i, 2020-2021 X4 M40i, 745Le xDrive, 2019-2021 Z4 M40i, and 2020-2021 Toyota Supra vehicles. During engine start, the engine management software may cause loss of braking assist. Full mechanical braking (without assist) remains available.
The risk
Loss of braking assist can increase the risk of a crash.
The fix
Dealers will update the engine management software, free of charge. Owner notification letters were mailed on September 17, 2021. Owners may contact BMW customer service at 1-800-525-7417.
Recall details
| NHTSA campaign | 21V-598 (21V598000) |
|---|---|
| Manufacturer | BMW of North America, LLC |
| Component | Engine |
| Report date | August 2, 2021 |
| Owners notified | September 17, 2021 |
| Vehicles affected | 50,024 |
| Initiated by | Manufacturer |
Vehicles covered
- 2020 BMW 540i
- 2020 BMW M340I
- 2020 BMW X3
- 2020 BMW X4
- 2021 BMW X4
- 2019 BMW Z4
- 2020 BMW Z4
- 2021 BMW Z4
- 2020 Toyota Supra
- 2021 Toyota Supra
Plus 2 other model/year combinations not covered on this site.
Owner complaints about the engine & cooling
Frequently asked questions
Is the recall 21V-598 repair free?
Yes. BMW dealers will fix the problem at no cost: Dealers will update the engine management software, free of charge. Owner notification letters were mailed on September 17, 2021. Owners may contact BMW customer service at 1-800-525-7417.
How do I know if my car is included?
Not every vehicle of the listed model years is affected — the recall covers 50,024 vehicles built in a certain window. Check your 17-character VIN with our VIN recall check or at nhtsa.gov/recalls.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.