Powertrain
generic / SAE
P0C22
Electric/Auxiliary Transmission Fluid Pump Phase U-V-W Circuit High
The auxiliary transmission fluid pump phase U-V-W output reports a circuit high condition. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / numberC / 22
Possible causes
- Phase wire shorted to B+ high
- Open motor winding medium
- Connector pins corroded - high contact resistance low
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 500–2500 €
- Estimated time: 2–8 h
- Component: aux trans pump phase uvw
- Component: aux trans pump inverter
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012