OBD-II code · Powertrain (generic)

P0C29 Electric/Auxiliary Transmission Fluid Pump A Driver Circuit Performance

The output driver of auxiliary transmission fluid pump A reports a performance fault. Driver characteristic outside calibration.

Is it safe to drive with P0C29?

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

Common causes

  • Most likelyDriver IGBT aged
  • PossibleThermal drift outside calibration

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 A Driver

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