BMW DTC P1B66 – Drive Motor Inverter Temperature Sensor ‘C’ Circuit Temperature Out of Range Low
DTC P1B66 meaning on BMW
The DTC P1B66 error code on BMW vehicles indicates an issue with the Drive Motor Inverter Temperature Sensor ‘C’ Circuit Temperature being out of range low. This means that the temperature sensor in the drive motor inverter is reporting a temperature that is lower than the expected range.
BMW DTC P1B66 symptoms
Symptoms of the DTC P1B66 error code on a BMW may include:
- Check Engine Light (MIL) illuminated on the dashboard
- Reduced power or performance
- Abnormal temperature readings on the dashboard
BMW DTC P1B66 causes
The causes of the DTC P1B66 error code on a BMW can vary, but common reasons include:
- Faulty drive motor inverter temperature sensor
- Wiring or connection issues in the temperature sensor circuit
- Internal faults in the drive motor inverter
BMW DTC P1B66 seriousness
The DTC P1B66 error code should not be ignored, as it can lead to reduced performance and potential damage to the drive motor inverter system. It is recommended to address this issue promptly to prevent further complications.
How to diagnose DTC P1B66 on BMW
To diagnose the DTC P1B66 error code on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s computer
- Inspect the drive motor inverter temperature sensor and its wiring for any visible damage or corrosion
- Test the temperature sensor using a multimeter to check for proper resistance values
- Check the connections and grounds in the temperature sensor circuit
How to fix DTC P1B66 on BMW
To fix the DTC P1B66 error code on a BMW, you can try the following solutions:
- Replace the drive motor inverter temperature sensor if it is found to be faulty
- Repair or replace any damaged wiring or connections in the temperature sensor circuit
- If internal faults are detected in the drive motor inverter, it may need to be repaired or replaced
How to erase DTC P1B66 on BMW
To erase the DTC P1B66 error code on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the vehicle’s computer. Once the issue has been addressed and fixed, clearing the codes will reset the Check Engine Light and ensure that the error code does not reappear.
Recommended tools & DTC Scanners for BMW
Best Diagnostic App for modern BMWs: BimmerLink
Recommended Bluetooth adapter for Bimmerlink: OBDLink CX
Cable adapter for Bimmerlink: Enet Cable USB Type C
For older BMWs we recommend: Autel AutoLink AL319 (2024 version)
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
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