BMW i4 2021–2025 — technical service bulletin
Bulletin B170124 · NHTSA communication 10253344 · issued Apr 26, 2024
Technical service bulletin
communication type
Engine and Engine Cooling
component
2021–2025
model years
11
vehicle entries
Official summary
There is coolant leaking from under the car Low heater output Possible Check Control message à ¢à  à  Drive, you can continue drivingà ¢à  à  (ID49) Possible fault codes stored in these BEV vehicles: 224163 à ¢à  à  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 à ¢à  à  Electric auxiliary heater: Communication in electric auxiliary heater faulty 224F60 - Coolant level sensor, expansion tank: Coolant leve
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.