P0C21

Electric/Auxiliary Transmission Fluid Pump Phase U-V-W Circuit Low

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

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

P0C22 P0C23 P0C24