BMW bulletin B640623
What it saysWhile the vehicle is at a standstill, a clicking noise can be heard in the passenger compartment. NHTSA’s full summary ↓
BMW filed this with NHTSA as a service bulletin dated Dec 20, 2023, received Jul 24, 2023, about the equipment — 2 documents under this number. It names 4 model years (2022–2024). 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 communicationWhile the vehicle is at a standstill, a clicking noise can be heard in the passenger compartment. It must bequiet without other electrical loads or without driving noises to be heard. It sounds like the noise comes from under the hood.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| B640623 | Service bulletin | Dec 20, 2023 | 10247568 | not found |
| B640623 | Service bulletin | Jun 1, 2023 | 10239612 | 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.
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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 4 model years this bulletin names have filed 89 complaints with NHTSA since 2015. 27 of them name Electrical System — 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 only way I could explain it was as if my brakes were failing. After joining the bmw i4 group on Facebook and having my kids record while driving. I was able to capture the issue. The vehicle drive train will malfunction causing the vehicle to move while not in motion when at a stop light. The vehicle will accelerate on its on.
2023 BMW i4 · Electrical System · filed with NHTSA Apr 23, 2025 · ODI 11656435
I am reporting a serious and recurring safety issue with my 2024 BMW i4, which I leased new in December 2023. The vehicle currently has approximately 20,000 miles and has stalled multiple times at high speeds, displaying a drivetrain malfunction warning and issues related to the power supply and high-voltage battery system.
2024 BMW i4 · Electrical System · filed with NHTSA Aug 1, 2025 · ODI 11677901
The contact owns a 2023 BMW 430i. The contact received notice of NHTSA Campaign Number: 26V056000 (Electrical System). The contact stated that that on several occasions when starting the vehicle there was a hesitation while starting the vehicle.
2023 BMW 4 Series · Electrical System · filed with NHTSA May 4, 2026 · ODI 11735453
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 equipment
Source: same model, same component group15 other manufacturer communications filed against these BMW models under the same component group (equipment), newest first. The eight newest are listed; the rest are on the BMW list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| B610615 | Service bulletin | Dec 18, 2024 | Washer Fluid Reservoir Rattles While Driving on Rough Roads. Rattling noises heard from vicinity of glove box. The windshield washer reservo… |
| B650121 | Service bulletin | Jun 12, 2024 | SPORADIC FAILURE OR CRACKING NOISE IN BASS SPEAKERS: No Bass or a cracking noise can be heard from the bass speakers. |
| B650421 | Service bulletin | Jun 4, 2024 | RETROFIT SATELLITE RADIO (OPTION CODE SA655): The affected vehicles were produced with Preparation BMW Satellite Radio (option code SA 693)… |
| B610321 | Service bulletin | Feb 28, 2024 | SITUATION BMW AG is conducting a Voluntary Emissions Recall (effective April 23, 2021) on a certain Model Year 2020 - 2021 BMW vehicles th… |
| B612422 | Service bulletin | Jan 2, 2024 | Delivery Stop: Combined Charging Unit. BMW AG has issued a Delivery Stop (effective October 14, 2022) on a small number of Model Year 2023 B… |
| B653823 | Service bulletin | Dec 19, 2023 | If regional navigational maps are downloaded into the vehicle via over-the-air, they cannot be installed into the active Navigation. |
| B840323 | Service bulletin | Dec 6, 2023 | BMW AG has issued a Delivery Stop (effective February 9, 2023) on certain Model Year 2022 – 2023 BMW vehicles that were produced between Jun… |
| B652823 | Service bulletin | Sep 11, 2023 | Customers may be experiencing one or more of these following issues with Bluetooth operation: Bluetooth cannot be switched on or off in the… |
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 B640623 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 B640623 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 B640623 cover?
The manufacturer filed it against 4 model years: 2023 BMW 4 Series, 2024 BMW i4, 2023 BMW i4, 2022 BMW i4. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.