BMW bulletin B240323
What it says?A software error may cause an unwanted pressure pulsation in the transmission during a "Remote Engine Start." NHTSA’s full summary ↓
BMW filed this with NHTSA as a service bulletin dated Aug 1, 2023, received Sep 25, 2023, about the engine. It names 24 model years (2020–2023). 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 communication?A software error may cause an unwanted pressure pulsation in the transmission during a "Remote Engine Start."
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| B240323 | Service bulletin | Aug 1, 2023 | 10242688 | 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: 2020 BMW 540D; 2021 BMW B7 Alpina.
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 22 model years this bulletin names have filed 817 complaints with NHTSA since 2015. 383 of them name Engine, 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.
On the 2020 BMW X5, the 13 owners who gave an odometer reading for Engine reported it at a median of 60,000 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
While driving on a highway the message power train malfunction appears on screen and engine shut off only allowing me seconds to coast to edge of road it was at night we could have been hit from behind we were able to push it further off the highway I tried restarting it over and over about 10 minutes went by it started we proceeded to…
2023 BMW X7 · Power Train · filed with NHTSA Oct 14, 2024 · ODI 11619682
On most modern BMW models (with Hot V V8 engines like the N/S 63) the coolant tank that is supposed to last at least the lifetime of the vehicle, only lasts about 40,000 Miles before cracking. The main issue is that the tank sits over the engine, which when coolant leaks, it will leak into the injectors causing engine misfires.
2022 BMW 5 Series · Engine · filed with NHTSA Sep 10, 2026 · ODI 11763306
Fuel pump failed within a minute of initial warning and performance indicating a problem. While driving ~60 mph on the highway, available power dropped to zero within a couple tenths of a mile, *barely* allowing me to move to the shoulder. Screen error/fault indicated vehicle was ok to keep driving but to schedule service soon.
2020 BMW M · Power Train · filed with NHTSA Jul 14, 2025 · ODI 11673452
In depth: 2020 BMW M engine 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 engine
Source: same model, same component group80 other manufacturer communications filed against these BMW models under the same component group (engine), newest first. The eight newest are listed; the rest are on the BMW list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 0011320800 | Service campaign | Oct 21, 2026 | The cylinder head cover was not installed correctly at the assembly plant. |
| 0012870600 | Service campaign | Oct 10, 2026 | Due to an implementation error in various OBD diagnostics in the vehicle's control units, in very rare cases itmay happen that stored fault… |
| 1171901000 | Warranty extension | Sep 22, 2026 | The Exhaust Gas Recirculation (EGR) Cooler (with EGR Valve) and the Auxiliary Exhaust Gas Recirculation (EGR) Cooler limited warranty for de… |
| B121126 | Service bulletin | Sep 9, 2026 | Potential customer complaints with no fault codes stored / No MIL displayed. 1. “Rough idle after idling for a longer period of time” 2. “Ve… |
| B064526 | Other | Sep 9, 2026 | Intake Muffler Return |
| 0011460700 | Emissions | Aug 26, 2026 | The return springs on the exhaust camshaft followers (switchable rocker arm) may break. |
| B064426 | Other | Aug 22, 2026 | Air Flap Return |
| B130126 | Service campaign | Aug 14, 2026 | Delivery Stop - Exhaust System Gasket |
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 B240323 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 B240323 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 B240323 cover?
The manufacturer filed it against 24 model years: 2023 BMW 3 Series, 2022 BMW 3 Series, 2021 BMW 3 Series, 2020 BMW 3 Series, 2022 BMW 4 Series, 2021 BMW 4 Series and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.