BMW DTC P0C21 – Electric/Auxiliary Transmission Fluid Pump Phase U-V-W Circuit Low
DTC P0C21 meaning on BMW
The DTC P0C21 fault code on BMW vehicles indicates an issue with the Electric/Auxiliary Transmission Fluid Pump Phase U-V-W Circuit being detected as low. This fault code is specific to the electric auxiliary transmission fluid pump system in the vehicle.
BMW DTC P0C21 symptoms
Symptoms of the BMW DTC P0C21 fault code may include:
- Check Engine Light illuminated on the dashboard
- Transmission shifting issues
- Reduced performance or drivability
BMW DTC P0C21 causes
Common causes of the BMW DTC P0C21 fault code include:
- Faulty electric auxiliary transmission fluid pump
- Wiring or connection issues in the U-V-W circuit
- Power supply problems to the pump
BMW DTC P0C21 seriousness
The seriousness of the BMW DTC P0C21 fault code lies in the potential transmission-related issues it can cause. Ignoring this fault code can lead to further damage to the transmission system and affect the overall drivability of the vehicle.
How to diagnose DTC P0C21 on BMW
To diagnose the DTC P0C21 fault code on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault code and any related codes.
- Inspect the electric auxiliary transmission fluid pump for any visible damage or signs of malfunction.
- Check the wiring and connections in the U-V-W circuit for any loose connections or damage.
- Test the power supply to the pump to ensure it is functioning correctly.
How to fix DTC P0C21 on BMW
To fix the DTC P0C21 fault code on a BMW, you can try the following:
- Replace the faulty electric auxiliary transmission fluid pump if necessary.
- Repair any damaged wiring or connections in the U-V-W circuit.
- Ensure the power supply to the pump is working properly.
- Clear the fault code and perform a test drive to verify the issue has been resolved.
How to erase DTC P0C21 on BMW
To erase the DTC P0C21 fault code on a BMW, you can use a diagnostic scanner to clear the code from the vehicle’s memory. After fixing the underlying issue causing the fault code, clearing the code will reset the Check Engine Light and ensure the system is monitoring for any new faults.
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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