BMW bulletin B240423
What it saysBMW AG has issued a Delivery Stop (effective September 28, 2023) on certain Model Year 2023 BMWvehicles that were produced between January 23, 2023, and June 15, 2023. NHTSA’s full summary ↓
BMW filed this with NHTSA as a service bulletin dated Sep 28, 2023, received Oct 1, 2023, about the power train. It names 7 model years (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.
BMW AG has issued a Delivery Stop (effective September 28, 2023) on certain Model Year 2023 BMWvehicles that were produced between January 23, 2023, and June 15, 2023.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| B240423 | Service bulletin | Sep 28, 2023 | 10242970 | PDF, 78 KB |
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.
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 7 model years this bulletin names have filed 82 complaints with NHTSA since 2015. 13 of them name Power Train — 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.
The contact owns a 2023 BMW X4. The contact stated that while driving 10 MPH, the transmission independently shifted into park(P) and then into reverse(R). The vehicle was restarted and the contact continued driving. The local dealer was not contacted. The manufacturer was not notified of the failure. The failure mileage was 20,214
2023 BMW X4 · Power Train · filed with NHTSA Sep 30, 2026 · ODI 11768173
My 2023 BMW M2 6-speed manual suffered a catastrophic clutch/transmission/drivetrain failure at approximately 16,000 miles. The vehicle is stock and was still under BMW warranty/CPO coverage. I purchased the vehicle at approximately 6,000 miles and I am the third owner. The incident occurred in on , on the side/westbound area.
2023 BMW M · Power Train · filed with NHTSA Sep 1, 2026 · ODI 11761324
We were driving the vehicle on a vacation, and am error came on that the gear was malfunction and parking will disable vehicle. At this fine, we kept trying to clear the message to be able to view navigation, and error message kept coming back making it impossible to drive. We then parked the vehicle and had vehicle towed.
2023 BMW 4 Series · Power Train · filed with NHTSA Sep 13, 2025 · ODI 11687079
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 power train
Source: same model, same component group11 other manufacturer communications filed against these BMW models under the same component group (power train), newest first. The eight newest are listed; the rest are on the BMW list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| B063826 | Other | Aug 3, 2026 | Shaft Return |
| 0033350200 | Service campaign | Sep 3, 2025 | The rear right driven half-shaft (aka output shaft/driven shaft) may not have been manufactured correctly during production and may break. I… |
| B240125 | Service campaign | May 28, 2025 | Delivery Stop Transmission Control Unit |
| 0033340200 | Service campaign | May 12, 2025 | Sufficient grease was not applied to the left rear axle shaft. The velocity joints could overheat after a short amount of driving |
| 0024750100 | Service campaign | Apr 18, 2025 | Due to a manufacturing issue, the torque on the bolts of the transmission Mechatronics was not carried outaccording to the specification. Th… |
| B260125 | Service campaign | Mar 6, 2025 | Delivery Stop - Driveshaft |
| 0024770100 | Service campaign | Jan 15, 2025 | During manufacturing, the dual-mass flywheel has not been sufficiently greased. The insufficient grease may result in acoustic abnormalitie… |
| B110924 | Service campaign | Nov 14, 2024 | Delivery Stop Flywheel |
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 B240423 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 B240423 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 B240423 cover?
The manufacturer filed it against 7 model years: 2023 BMW 3 Series, 2023 BMW 4 Series, 2023 BMW M, 2023 BMW X3, 2023 BMW X4, 2023 BMW X5 and more. 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: 2023 BMW: built on or after 23 Jan 2023 — the build date is on the certification label in the driver’s door jamb.