GROUNDWORK — 21V598000: During engine start, the engine management software may cause loss of braking assist BMW X4 and 6 other models: check the listed vehicles, the reported issue and the manufacturer remedy for 21V598000. Keep the official status and service answers in one private record. Campaign: 21V598000 Official record checked: 2026-10-19T20:40:19.471Z Official campaign: https://api.nhtsa.gov/recalls/campaignNumber?campaignNumber=21V598000 Official VIN lookup: https://www.nhtsa.gov/recalls LISTED VEHICLES (VIN confirmation required) 2020 BMW X4 2020 BMW X3 2020 BMW Z4 2020 BMW 745LE 2019 BMW Z4 2021 BMW Z4 2021 BMW 745LE 2021 BMW X4 2020 BMW 540I 2020 TOYOTA SUPRA 2020 BMW M340I 2021 TOYOTA SUPRA OFFICIAL REPORTED ISSUE 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. OFFICIAL REPORTED CONSEQUENCE Loss of braking assist can increase the risk of a crash. OFFICIAL REPORTED REMEDY 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. OFFICIAL NOTES Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.nhtsa.gov. OWNER PREPARATION Record an existing symptom and its date. Do not reproduce a loss of power, stall or transmission fault in traffic. REMEDY TIMING IN THE DATED SOURCE Confirm current remedy arrangements The source does not explicitly establish current remedy availability. Ask the manufacturer about the applicable remedy, required parts or software, appointment arrangements and any interim instructions. Current availability for your VIN: unconfirmed. YOUR SERVICE QUESTIONS 1. Does the manufacturer confirm that campaign 21V598000 applies to this VIN, including the report’s equipment and production restrictions? A matching model and year is only a starting point. The official lookup or manufacturer must establish the individual vehicle’s status. Discussion status / answer: __________ 2. What remedy, required parts or software, and appointment arrangements are currently available for this VIN, and which interim instructions apply? The source does not explicitly establish current remedy availability. Ask the manufacturer about the applicable remedy, required parts or software, appointment arrangements and any interim instructions. Discussion status / answer: __________ 3. Which engine or transmission component is covered, and does an existing drivability problem need separate diagnosis? Compare the answer with the reported component: ENGINE. Discussion status / answer: __________ 4. Which module and software completion record demonstrate that the update for 21V598000 was applied? Ask the service provider how the campaign-specific software remedy is documented. A dashboard reset is not evidence of the specified update. Discussion status / answer: __________ 5. What dated document records the remedy performed under 21V598000, and what should I do if the reported concern remains? Keep campaign completion and unresolved symptoms as separate questions. A saved worksheet or booked appointment does not establish a repair. Discussion status / answer: __________ OFFICIAL LOOKUP DECISIONS Not checked or unavailable: eligibility remains unconfirmed; use the official lookup or manufacturer. Campaign listed as open: confirm current instructions, availability and remedy arrangements. Campaign not listed as open: reconcile repair history and lookup coverage with the manufacturer if needed. A zero-open result does not diagnose symptoms. Work order records completed recall work: keep the exact campaign and dated remedy record; report unresolved symptoms separately. YOUR RECORD Check date: __________ Official lookup result: __________ Service arrangement: __________ Existing observation: __________ Questions and work-order notes (no VIN or plate needed): __________ LOOKUP LIMITS A model/year match does not establish VIN eligibility. The official lookup may omit completed recalls, some recent campaigns or recalls outside its coverage. The listed defect does not prove the cause of a symptom on your vehicle. This guide supports owner preparation and does not provide a repair procedure.