P0C21
Electric/Auxiliary Transmission Fluid Pump Phase U-V-W Circuit Low
P0C21 is an OBD-II diagnostic trouble code meaning: Electric/Auxiliary Transmission Fluid Pump Phase U-V-W Circuit Low. Common causes: electrical transmission fluid pump malfunction, wiring harness damage. Estimated repair cost: $56–167.
Symptoms
- Rough gear shifting
- Reduced transmission performance
- Check Engine Light Illuminates
- Noises from the transmission area
- Transmission overheating
Causes
- Electrical transmission fluid pump malfunction
- Wiring harness damage
- Poor contact in connectors
- Problems with the transmission control unit
- Short circuit in the circuit
How to Fix
- Check the voltage in the phase circuit U-V-W
- Inspect the wiring harness for damage
- Check contacts in connectors
- Test the transmission fluid pump
- Replace pump or wiring harness if necessary
Related codes
Error P0C21 by Vehicle Brand
FAQ
What does the P0C21 code mean?
P0C21 is an OBD-II diagnostic trouble code that indicates: Electric/Auxiliary Transmission Fluid Pump Phase U-V-W Circuit Low
What causes a P0C21 error code?
The most common causes of P0C21 include: Electrical transmission fluid pump malfunction; Wiring harness damage; Poor contact in connectors; Problems with the transmission control unit.
How do I fix a P0C21 diagnostic trouble code?
To fix P0C21: Check the voltage in the phase circuit U-V-W. Inspect the wiring harness for damage. Check contacts in connectors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0C21?
Limited driving only, diagnose soon
How much does it cost to fix P0C21?
The estimated repair cost for P0C21 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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