OBD-II code · Powertrain (generic)

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.

Is it safe to drive with P0C22?

The car may go into limp mode (reduced power). Get it diagnosed before a long trip.

Common causes

  • Most likelyPhase wire shorted to B+
  • PossibleOpen motor winding
  • Less likelyConnector pins corroded - high contact resistance

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

Repair at a glance

Difficulty
Hard
DIY friendly
Best left to a mechanic
Typical labour
2–8 h
Emissions test
Usually unaffected
Parts involved
Aux Trans Pump Phase Uvw, Aux Trans Pump Inverter

Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.