BMW bulletin B540324
What it saysThe convertible top does not open or close. NHTSA’s full summary ↓
BMW filed this with NHTSA as a service bulletin dated Jan 13, 2025, received Jan 23, 2025, about the structure. It names 5 model years (2019–2023). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationWhat it applies to, as the document itself states it — the build window in the manufacturer’s own words, read by machine from the PDF NHTSA serves. The build date is on the certification label in the driver’s door jamb; the dealer settles a borderline vehicle by its VIN.
The convertible top does not open or close.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| B540324 | Service bulletin | Jan 13, 2025 | 11013048 | PDF, 710 KB |
What the document itself lists
Labour operation and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 54 99 000 | Additional work time to replace the hall effect sensor (Associated work) | 3 FRU |
Read by machine from the document NHTSA serves (4 pages), read Sep 30, 2026. A part number is shown only where it matches BMW’s own catalogue shape, an operation only with its code and time, and a description only where the reader got it whole; anything it could not settle is left out, and the PDF is the record. Times are the manufacturer’s warranty allowances, not a quote. Listings and prices on eBay Motors are the seller’s.
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The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Doing the repair yourself, or pricing it before the shop does? Search the part by fitment on eBay Motors — the listing and the price are the seller’s.
Find the body for the 2023 Z4 →Affiliate disclosure: some links on this page are affiliate links. If you request a quote or buy through them we may earn a commission at no extra cost to you. Nothing on this page changes because of it.
Model years it names
Source: as the manufacturer filed themA vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
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What owners reported
Source: NHTSA complaint databaseOwners of the 5 model years this bulletin names have filed 12 complaints with NHTSA since 2015. 2 of them name Structure — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
Was in a drive thru on 9/6/2020 waiting our turn. Approx. 7 cars in front of US. As we are slowly moving up to order, car in idle, foot on brake. As we are moving forward, when we were up to 3 cars, still idling and foot on brake, the car had fully accelerated, brake not holding the car, inching forward due to the force of the…
2020 BMW Z4 · Structure · filed with NHTSA Oct 7, 2020 · ODI 11363216
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the structure
Source: same model, same component group4 other manufacturer communications filed against the BMW Z4 under the same component group (structure), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| B410424 | Service bulletin | Aug 20, 2025 | A groaning sound from the front of the vehicle while driving can be heard, particularly while cornering. The groaning sound can be heard in… |
| B540225 | Service bulletin | Mar 27, 2025 | While driving on an uneven road, a “clicking”sound is heard from the front bow/cowl panelarea of the convertible top. |
| B511219 | Service bulletin | Jul 29, 2024 | KIDNEY GRILL ACTIVE AIR FLAP FAULTS: A check control message or MIL (Malfunction Indicator Lamp) may be illuminated, with one or more of the… |
| B511323 | Service bulletin | Aug 1, 2023 | ?The outer A-pillar trim panel (arrow) protrudes outward (circled) towards the cowl seal. |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for BMW, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is BMW B540324 a recall?
No. A service bulletin is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the B540324 repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way. Every BMW warranty extension on file lists the ones BMW has filed.
Which vehicles does B540324 cover?
The manufacturer filed it against 5 model years: 2023 BMW Z4, 2022 BMW Z4, 2021 BMW Z4, 2020 BMW Z4, 2019 BMW Z4. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone. The document itself sets the build window: G29 Z4 Roadster After: built 1 Jan 2018 – 19 Jan 2024 — the build date is on the certification label in the driver’s door jamb.