BMW bulletin B170124
BMW filed this with NHTSA as a service bulletin dated Feb 25, 2026, received May 3, 2024, about the engine — 5 documents under this number. It names 13 model years (2021–2025). 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.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThere is coolant leaking from under the car Low heater output Possible Check Control message “Drive, you can continue drivingâ€ÂÂ� (ID49) Possible fault codes stored in these BEV vehicles: 224163 – Electric auxiliary heater for the high-voltage battery unit: Undervoltage or internal communication fault 8049AA - Coolant level sensor, expansion tank: Coolant level low or short circuit to ground or line disconnection 80124F – Electric auxiliary heater: Communication in electric auxiliary heater faulty 224F60 - Coolant level sensor, expansion tank: Coolant level low or short circuit to ground or line disconnection 224111 - Cooling system for power electronics: Coolant loss detected 224107 - Cooling system for high-voltage battery unit, component protection: Detection of coolant loss
Documents filed under this number
| Document | Kind | Dated | NHTSA id |
|---|---|---|---|
| B170124 | Service bulletin | Feb 25, 2026 | 11029046 |
| B170124 | Service bulletin | Mar 31, 2025 | 11016419 |
| B170124 | Service bulletin | Feb 11, 2025 | 11014422 |
| B170124 | Service bulletin | Feb 3, 2025 | 11014035 |
| B170124 | Service bulletin | Apr 26, 2024 | 10253344 |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5; the full text comes from the manufacturer or a dealer. 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. Quote it 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: 2021 BMW IX.
A vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
Common questions
Source: NHTSA, 49 CFR 579.5Is BMW B170124 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 B170124 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.
Which vehicles does B170124 cover?
The manufacturer filed it against 13 model years: 2024 BMW i4, 2023 BMW i4, 2022 BMW i4, 2025 BMW i5, 2024 BMW i5, 2025 BMW i7 and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.