BMW DTC P0C91 – Hybrid/EV Battery Temperature Sensor ‘J’ Circuit Intermittent/Erratic
DTC P0C91 meaning on BMW
The Diagnostic Trouble Code (DTC) P0C91 for BMW indicates an issue with the Hybrid/EV Battery Temperature Sensor ‘J’ Circuit being intermittent or erratic. This sensor is responsible for monitoring the temperature of the hybrid or electric vehicle battery to ensure it operates within safe limits.
BMW DTC P0C91 symptoms
Symptoms of the DTC P0C91 on a BMW may include:
- Check Engine Light (MIL) illuminated
- Hybrid/EV system warning light on
- Reduced hybrid or electric vehicle performance
- Increased fuel consumption
- Possible overheating of the battery
BMW DTC P0C91 causes
Common causes of the DTC P0C91 on a BMW include:
- Faulty Hybrid/EV Battery Temperature Sensor ‘J’
- Wiring or connection issues in the sensor circuit
- Intermittent sensor signal
- Software or calibration issues
BMW DTC P0C91 seriousness
The DTC P0C91 should be addressed promptly as it can affect the proper operation of the hybrid or electric vehicle system. Ignoring this code may lead to further damage to the battery or other components, potentially resulting in costly repairs.
How to diagnose DTC P0C91 on BMW
To diagnose the DTC P0C91 on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scan tool to retrieve the fault code and freeze frame data
- Inspect the Hybrid/EV Battery Temperature Sensor ‘J’ and its wiring for any visible damage or corrosion
- Check the sensor’s resistance and voltage readings to ensure it is functioning correctly
- Perform a battery temperature sensor test using a multimeter
- Verify the sensor’s signal with a scan tool while monitoring the battery temperature
How to fix DTC P0C91 on BMW
To fix the DTC P0C91 on a BMW, the following steps may be taken:
- Replace the faulty Hybrid/EV Battery Temperature Sensor ‘J’
- Repair any damaged wiring or connections in the sensor circuit
- Clear the fault code and perform a test drive to ensure the issue is resolved
- If the problem persists, further diagnosis may be required to address underlying issues
How to erase DTC P0C91 on BMW
To erase the DTC P0C91 on a BMW, the fault code can be cleared using a diagnostic scan tool. After the repair or replacement of the sensor, the code can be reset, and the vehicle should be driven to ensure the code does not return. If the issue has been successfully resolved, the DTC P0C91 should no longer 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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