BMW bulletin B340423
What it saysBMW AG has issued a Delivery Stop (effective December 20, 2023) on certain Model Year 2023 - 2024BMW vehicles that were produced between July 4, 2022, and October 26, 2023. NHTSA’s full summary ↓
BMW filed this with NHTSA as a service bulletin dated Dec 20, 2023, received Jan 3, 2024, about the service brakes. It names 15 model years (2023–2024). 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 communicationBMW AG has issued a Delivery Stop (effective December 20, 2023) on certain Model Year 2023 - 2024BMW vehicles that were produced between July 4, 2022, and October 26, 2023.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| B340423 | Service bulletin | Dec 20, 2023 | 10247569 | not found |
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 themAlso filed against model years this site has no page for: 2023 BMW Redundant 7.
A 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 14 model years this bulletin names have filed 459 complaints with NHTSA since 2015. 271 of them name Service Brakes — 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 I7. The contact stated that while driving 50 MPH, the vehicle became inoperable. The contact engaged the parking brake to stop the vehicle. The contact received notification of NHTSA Campaign Number: 24V104000 (ELECTRONIC STABILITY CONTROL (ESC), SERVICE BRAKES, HYDRAULIC); however, the part to do the recall…
2023 BMW i7 · Service Brakes · filed with NHTSA Oct 16, 2024 · ODI 11620090
While driving the vehicle at highway speed, the vehicle did not respond as expected during braking. Upon attempting to slow the vehicle, control was lost, the vehicle became unstable, left the roadway, and rolled. As a result of the incident, the driver sustained serious injuries requiring emergency transport and hospitalization.
2023 BMW X5 · Service Brakes · filed with NHTSA Dec 30, 2025 · ODI 11707697
On 2/25/26, in rush hour traffic we were driving on a NJ highway. We happened to be in the left-most of 3 lanes with a concrete divider (no shoulder – there was about 3 ft between the concrete divider and the left side of the left lane). We were about 4 car lengths behind the next car when traffic was slowing for a red light.
2024 BMW X1 · Service Brakes · filed with NHTSA Mar 27, 2026 · ODI 11727462
In depth: 2023 BMW X1 brake problems → · 2024 BMW X5 brake problems →
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 service brakes
Source: same model, same component group10 other manufacturer communications filed against these BMW models under the same component group (service brakes), newest first. The eight newest are listed; the rest are on the BMW list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 0034460300 | Service campaign | Oct 13, 2026 | The Integrated Brake (IB) power supply cable is covered with mesh protection and contact with the brakeline causes wear on the protective co… |
| 0034220300 | Service campaign | Aug 22, 2025 | The parking brake actuator has not been wound correctly so that it cannot be applied or released. Check Control message “Parking brake faile… |
| B341025 | Service bulletin | Jul 14, 2025 | After programming from the I-Levels between …24-03-505 and lower than …24-03-540 to I-Level …24-11-530 or higher, the following CCM may be d… |
| B340725 | Service bulletin | Jun 11, 2025 | A loud “click”- type noise can be heard from the rear axle brakes when driving off forwards, and/or in reverse. |
| B340625 | Service bulletin | May 2, 2025 | Brake “groaning” noises heard at the rear axle at slow speeds, i.e. close to standstill, stop and go driving;when parking or maneuvering. |
| 0034130300 | Service campaign | Mar 27, 2025 | The parking brake actuator cannot be activated or deactivated due to a failed weld. Check Control message “Parking brake failed. When parkin… |
| B340125 | Service campaign | Feb 21, 2025 | DELIVERY STOP: EMF ACTUATOR |
| B350123 | Service bulletin | Jan 24, 2025 | When the brake pedal is pressed/ released, a creaking noise may be heard from the pedal area for the Integrated Brake System (IB). This noi… |
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 B340423 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 B340423 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 B340423 cover?
The manufacturer filed it against 15 model years: 2023 BMW 5 Series, 2024 BMW X1, 2023 BMW X1, 2024 BMW X5, 2023 BMW X5, 2024 BMW X6 and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.