# Service bulletin B170124

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 11016419
- Published by NHTSA: 2025\-04\-03
- Manufacturer's number: B170124
- Manufacturer's date: 2025\-03\-31
- NHTSA component: ENGINE

## NHTSA's summary

There is coolant leaking from under the car Low heater output Possible Check Control message “Drive, you can continue driving” \(ID49\) 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

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11016419-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11016419-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine

## Vehicles listed

- 2022 to 2024 BMW I4
- 2024 to 2025 BMW I5
- 2023 to 2025 BMW I7
- 2021 BMW IX
- 2022 to 2025 BMW IX

## Other bulletins for the same vehicles and component

- [B640326](/bulletins/11032742.md), 2026-05-18, Service bulletin: ENGINE. After starting up the vehicle, a distinct, constant, “humming” noise can be heard from the right area of the instrument panel.
- [B170124](/bulletins/11029046.md), 2026-02-26, Service bulletin: ENGINE. There is coolant leaking from under the car Low heater output Possible Check Control message “Drive, you can continue driving” \(ID49\) 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
- [B063625](/bulletins/11020075.md), 2025-07-02, Other: ENGINE. Hydrobearing Return
- [B640725](/bulletins/11019571.md), 2025-06-17, Service campaign: ENGINE. A faulty electric auxiliary heater may have been installed in the certain vehicles. This could result in the failure of the electric auxiliary heater.
- [B640625](/bulletins/11019570.md), 2025-06-17, Service campaign: ENGINE. A faulty electric auxiliary heater may have been installed in the certain vehicles. This could result in the failure of the electric auxiliary heater.
- [B170125](/bulletins/11017503.md), 2025-05-02, Service campaign: ENGINE. 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 of the hose.
- [B170124](/bulletins/11014422.md), 2025-02-24, Service bulletin: ENGINE. There is coolant leaking from under the car Low heater output Possible Check Control message “Drive, you can continue driving” \(ID49\) 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
- [B170124](/bulletins/11014035.md), 2025-02-10, Service bulletin: ENGINE. There is coolant leaking from under the car Low heater output Possible Check Control message “Drive, you can continue driving” \(ID49\) Possible fault codes stored in these BEV vehicles: 224163 – Electric auxiliary heater for the high\-voltage battery unit: Undervoltage or internalcommunication fault 8049AA \- Coolant level sensor, expansion tank: Coolant level low or short circuit to ground or linedisconnection 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 linedisconnection 224111 \- Cooling system for power electronics: Coolant loss detected 224107 \- Cooling system for high\-voltage battery unit, component protection: Detection of coolantloss
- [B641324](/bulletins/11012094.md), 2024-12-31, Service campaign: ENGINE. Quality checks have determined that the coolant changeover valve may develop a coolant leak under verylow outside temperatures \(significantly lower than 32º F \(0 C\)\).
- [B640724](/bulletins/11005237.md), 2024-07-25, Service campaign: ENGINE. Quality checks have determined that the coolant changeover valve may develop a coolant leak under very low outside temperatures \(significantly lower than 32º F \(0 C\)\).

JSON: [/v1/bulletins/11016419](/v1/bulletins/11016419)

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