2022-2025 BMW i-Series Coolant Leak and Heater Output TSB

Owners of 2022-2025 BMW i-Series vehicles, particularly the BMW i5, may encounter issues like a coolant leak or reduced heating performance. This Technical Service Bulletin (NHTSA ID 10253344) outlines common symptoms and associated fault codes that can help diagnose these problems.

The TSB focuses on issues related to the electric auxiliary heater and the high-voltage battery unit's cooling system, which can lead to coolant loss and affect cabin heating.

Symptoms

If you own a BMW i5 coolant leak may manifest as visible fluid under the car. Other indicators of this issue include:

• Coolant leaking from under the vehicle.
• Noticeably low heater output in the cabin.
• A Check Control message displayed on the instrument cluster, stating: "Drive, you can continue driving" (ID49).

These symptoms suggest a potential problem within the vehicle's cooling system or electric auxiliary heater.

Fault Codes / DTCs

Technicians may find specific fault codes stored in the vehicle's system when diagnosing a BMW i5 coolant leak or low heater output. These codes point to issues with the electric auxiliary heater, coolant level sensor, or the cooling system itself.

Diagnosis and Trigger Conditions

Diagnosing a BMW i5 coolant leak typically involves checking for the symptoms listed above and performing a diagnostic scan for the associated fault codes. The presence of these codes, especially those related to coolant loss or heater communication, indicates the need for further investigation into the cooling system components. The TSB (NHTSA ID 10253344) provides detailed guidance for technicians to accurately pinpoint the root cause of these issues.

Repair Procedure Summary

While the TSB summary does not detail the exact repair steps, it indicates that the issues stem from the electric auxiliary heater and coolant level sensor. Repairs will likely involve a thorough inspection of the cooling system, including the high-voltage battery unit's cooling components and the electric auxiliary heater. Technicians will follow the procedures outlined in Technical Service Bulletin 10253344 to address any coolant leaks, communication faults, or sensor malfunctions, which may include component replacement or system recalibration.

Owner Action

If you experience any of the described symptoms, such as a coolant leak under your vehicle, reduced heater performance, or the "Drive, you can continue driving" message, it is recommended to contact your authorized BMW dealer. Inform them of the symptoms you are observing and mention the potential relevance of NHTSA ID 10253344. Your dealer can perform the necessary diagnostics and repairs according to BMW's specifications.

Source: NHTSA ID 10253344.