BMW bulletin B640621
What it saysDifferent air temperatures are felt from left to right out of the front fresh air grilles (air vent). NHTSA’s full summary ↓
BMW filed this with NHTSA as a service bulletin dated Sep 1, 2021, received Sep 7, 2021, about the equipment — 2 documents under this number. It names 19 model years (2016–2021). 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 communicationDifferent air temperatures are felt from left to right out of the front fresh air grilles (air vent). The following fault code is saved in the IHKA (integrated automatic heating/air conditioning system) control unit: 801189 - Engine mixed air right: Initialization fault.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| B640621 | Service bulletin | Sep 1, 2021 | 10204657 | not found |
| B640621 | Service bulletin | Jul 1, 2021 | 10201145 | 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.
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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 19 model years this bulletin names have filed 599 complaints with NHTSA since 2015. 56 of them name Engine — 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.
Engine mount replace required at 37000 per dealership service inspection. Informed that it is standard for this part to fail repeatedly during life of engine. Retail price of repair at dealership estimated at $3000, offered repair for $1200. Informed that a driving hazard and cause for more engine damage if not replaced
2021 BMW 2 Series · Engine · filed with NHTSA Jun 5, 2026 · ODI 11742389
When starting my car and moving it into the reverse position or drive it starts to sometimes stalls. It doesn't happen all the time but does happen. It tells me the car is not in park. I brought it to a shop and they said it's the crankshaft sensor and there is a recall for cars like mine but not my specific vin.
2018 BMW X2 · Engine · filed with NHTSA Aug 28, 2026 · ODI 11760399
BMW Federal Emissions Recall Campaign - Delivery Stop: Replace Coolant Expansion Tank [B170324] The manufacturer's recall remedy replaces a defective, heat-compromised plastic coolant reservoir with an identical plastic component that is subject to the exact same thermal fatigue and catastrophic failure.
2021 BMW M · Engine · filed with NHTSA Oct 15, 2026 · ODI 11771370
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 group17 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 |
|---|---|---|---|
| B010122 | Service bulletin | Jan 21, 2026 | With the court's FINAL approval, BMW of North America, LLC (BMW NA) has entered into a nationwide settlement with the plaintiffs in the foll… |
| 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… |
| 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… |
| B661523 | Service bulletin | Nov 16, 2023 | Emergency Stop Assistant is activated. Thisicon will appear in the CID when this function is activated. |
| 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 B640621 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 B640621 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 B640621 cover?
The manufacturer filed it against 19 model years: 2021 BMW 2 Series, 2020 BMW 2 Series, 2021 BMW M, 2021 BMW X1, 2020 BMW X1, 2019 BMW X1 and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.