BMW bulletin B640224
What it saysThe coolant changeover valve may develop a coolant leak when the outside temperatures go below 19°F (-7°C). NHTSA’s full summary ↓
BMW filed this with NHTSA as a service bulletin dated May 23, 2024, received Feb 1, 2024, about the engine — 3 documents under this number. It names 5 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 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 coolant changeover valve may develop a coolant leak when the outside temperatures go below 19°F (-7°C). The vehicles operating systems would also need to be at that same low temperature (example: being parked outside, overnight in low temperatures).
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| B640224 | Service bulletin | May 23, 2024 | 11000510 | PDF, 463 KB |
| B640224 | Service bulletin | Feb 5, 2024 | 10250367 | PDF, 476 KB |
| B640224 | Service bulletin | Jan 26, 2024 | 10249421 | PDF, 355 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.
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.
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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 5 model years this bulletin names have filed 117 complaints with NHTSA since 2015. 36 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
This is the 4th time I am having issues with this car. Major safety issues. Yesterday during during on the 405 freeway. It suddenly started to rain, the wiper malfunction while in traffic and pouring rain. A week before this incident, the steering of the car kept moving suddenly out of my line. This time my son was in the car.
2024 BMW i7 · Electrical System · filed with NHTSA Sep 3, 2025 · ODI 11684707
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
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 engine
Source: same model, same component group7 other manufacturer communications filed against these BMW models under the same component group (engine), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| B170124 | Service bulletin | Feb 25, 2026 | There is coolant leaking from under the car Low heater output Possible Check Control message “Drive, you can continue driving” (ID49) Pos… |
| 0064420200 | Service campaign | Jun 6, 2025 | A faulty electric auxiliary heater may have been installed in the certain vehicles. This could result in the failure of the electric auxilia… |
| 0064410200 | Service campaign | Jun 6, 2025 | A faulty electric auxiliary heater may have been installed in the certain vehicles. This could result in the failure of the electric auxilia… |
| 0017270200 | Service campaign | Apr 30, 2025 | The coolant hose which runs from the combined charging unit (CCU) to the front electric motor’s housingmay develop a leak at the motor end o… |
| 0064280200 | Service campaign | Jul 12, 2024 | Quality checks have determined that the coolant changeover valve may develop a coolant leak under very low outside temperatures… |
| B640624 | Service campaign | May 24, 2024 | Quality checks have determined that the coolant changeover valve may develop a coolant leak under very low outside temperatures… |
| B613223 | Service bulletin | Dec 7, 2023 | BMW AG has issued a Delivery Stop (effective December 7, 2023) on certain Model Year 2023 BMW vehicles that were produced between July 4, 20… |
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 B640224 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 B640224 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 B640224 cover?
The manufacturer filed it against 5 model years: 2024 BMW i4, 2023 BMW i4, 2024 BMW i5, 2024 BMW i7, 2023 BMW i7. 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 -2024 BMW: built on or after 10 Feb 2023; built 3 May 2023 – 11 Jan 2024; G60 i5 Sedan (BEV): built 6 Jul 2023 – 12 Jan 2024 — the build date is on the certification label in the driver’s door jamb.