BMW bulletin MCAS4023
What it saysBMW AG has requested the inspection of all dealer stock of the following part number(s) listed below to ensure the spacer is conformed to drawing. NHTSA’s full summary ↓
BMW filed this with NHTSA as a service bulletin dated Sep 29, 2023, received Oct 1, 2023, about the power train. It names 52 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.
Get the next BMW bulletin for your model by email Weekly, only when something new is filed. Nothing else; one-click unsubscribe.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationBMW AG has requested the inspection of all dealer stock of the following part number(s) listed below to ensure the spacer is conformed to drawing.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| MCAS4023 | Service bulletin | Sep 29, 2023 | 10242967 | 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.
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.
Find the driveshaft for the 2023 2 Series →Affiliate disclosure: some links on this page are affiliate links. If you request a quote or buy through them we may earn a commission at no extra cost to you. Nothing on this page changes because of it.
Model years it names
Source: as the manufacturer filed themAlso filed against model years this site has no page for: 2023 BMW 240I; 2023 BMW 540D; 2023 BMW C 400 GT; 2023 BMW C 400 X; 2023 BMW CE 04; 2023 BMW F 750 GS; 2023 BMW F 850 GS; 2023 BMW F 850 GS Adventure; 2023 BMW F 900 R; 2023 BMW F 900 XR; 2023 BMW G 310 GS; 2023 BMW G 310 R; 2023 BMW K 1600 B; 2023 BMW K 1600 GT; 2023 BMW K 1600 GTL; 2023 BMW M 1000 R; 2023 BMW M4 GT4; 2023 BMW R 1250 GS; 2023 BMW R 1250 GS Adventure; 2023 BMW R 1250 R; 2023 BMW R 1250 RS; 2023 BMW R 1250 RT; 2023 BMW R 18; 2023 BMW R 18 B; 2023 BMW R 18 Classic; 2023 BMW R 18 Transcontinental; 2023 BMW R Ninet; 2023 BMW R Ninet Pure; 2023 BMW R Ninet Scrambler; 2023 BMW R Ninet Urban GS; 2023 BMW S 1000 R; 2023 BMW S 1000 RR; 2023 BMW S 1000 XR.
A vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
Email me new BMW bulletins for one of these models
A weekly email, sent only in a week when BMW files something new with NHTSA for the model you pick — service bulletins, campaigns, warranty extensions, over-the-air notices, every model year. Nothing else is sent; one-click unsubscribe in every message. Separate from recall alerts.
What owners reported
Source: NHTSA complaint databaseOwners of the 19 model years this bulletin names have filed 333 complaints with NHTSA since 2015. 45 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.
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
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
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 group27 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 |
| B330124 | Service bulletin | Jun 6, 2026 | The vehicle will no longer move when put into gear. There may also be loud noise coming from the HEAT*(electric drivetrain)/Rear axles. *Ger… |
| B120523 | Service bulletin | Mar 6, 2026 | The customer states there is a Drivetrain Malfunction message displayed in the instrument cluster. In addition, the following fault memory… |
| B280125 | Service bulletin | Jan 27, 2026 | SITUATION A Check Control message (CCM) displays for “Transmission oil service required” (ID 2120). This warning will typically trigger base… |
| 00 61 72 00 00 | Service campaign | Dec 22, 2025 | After quality inspection it has been found that the reverser control unit PN 61 35 8 524 078 was installed ona number of units. This specifi… |
| 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… |
| 2516900100 | Warranty extension | Jul 31, 2025 | The limited warranty for the automatic transmissions Selector Lever Magnetic Shift Interlock Mechanism (Gearshift lug assembly portion) has… |
| B240125 | Service campaign | May 28, 2025 | Delivery Stop Transmission Control Unit |
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 MCAS4023 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 MCAS4023 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 MCAS4023 cover?
The manufacturer filed it against 52 model years: 2023 BMW 2 Series, 2023 BMW 3 Series, 2023 BMW 4 Series, 2023 BMW 5 Series, 2023 BMW 7 Series, 2023 BMW 8 Series and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.