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Engine and transmission · UNITED STATES

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.

Official record checked 2026-10-19 UTC · Filing date 2021-08-02

Start with the specific vehicle

The report lists 12 model-year entries. Read the equipment and production restrictions in the reported issue, then use the official lookup or manufacturer to establish whether this campaign applies to your vehicle.

View the listed model years
  • 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

Check your VIN on NHTSA →

Enter the VIN only on the official service or manufacturer site. This worksheet does not ask for it.

What the official report says

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 NHTSA campaign record

Why the reported issue matters

Loss of braking assist can increase the risk of a crash.

Official NHTSA campaign record

Prepare your observation

Record an existing symptom and its date. Do not reproduce a loss of power, stall or transmission fault in traffic.

A reported defect describes the campaign. It does not establish what caused a symptom on your individual vehicle, and absence of a symptom does not establish that an open recall is complete.

The reported manufacturer 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 NHTSA campaign record

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.

This describes the dated source record. Current arrangements for your VIN remain unconfirmed.

Additional 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.

View the source

Choose the next step from the official result

Not checked or unavailable

Keep eligibility unconfirmed. Use the official lookup or contact the manufacturer with 21V598000.

This campaign is open

Confirm current interim instructions, remedy availability and service arrangements. Keep the dated answer.

Not listed as open

Review earlier repair records and lookup limits if needed. A zero-open result does not explain an unresolved symptom.

Work order records recall work

Keep the campaign number, remedy and date together. Ask separately about a symptom that remains after the visit.

Your campaign-specific service questions

Use these questions with the official report. Keep the answers beside the remedy record; “discussed” records a conversation, not a completed repair.

  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.

  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.

  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.

  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.

  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.

Download the full guide and blank worksheet

Source and lookup coverage

NHTSA 21V598000: official campaign data · Official lookup and coverage limits

The quoted issue, consequence and remedy come from the official record as checked above. This independent guide adds a vehicle-check decision process, service questions and a private worksheet. Confirm current eligibility, remedy availability and interim instructions with the manufacturer.

The official VIN lookup may omit completed recalls, some recent campaigns and recalls outside its coverage. Vehicle notes and answers stay in this browser. A downloaded brief contains your notes; keep it appropriately. Groundwork is independent of NHTSA and the manufacturer.