OBD-II code · Powertrain (generic)

P0C23 Electric/Auxiliary Transmission Fluid Pump Control Module Circuit/Open

The auxiliary transmission fluid pump control module circuit reports a circuit/open condition.

Is it safe to drive with P0C23?

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

Common causes

  • Most likelyOpen in module circuit
  • PossibleOpen module input
  • Less likelyPin pushed back out of connector body

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
Medium
DIY friendly
Best left to a mechanic
Typical labour
1–5 h
Emissions test
Usually unaffected
Parts involved
Aux Trans Pump Control Module, Wiring Harness, Tcm

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