OBD-II code · Powertrain (generic, extended)

P27A2 Electric/Auxiliary Transmission Fluid Pump B Control Circuit / Open

The controller cannot drive the second auxiliary transmission fluid pump.

Is it safe to drive with P27A2?

Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.

Common causes

  • Most likelyOpen pump motor winding
  • PossibleBroken control wire

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
1–4 h
Emissions test
Usually unaffected
Parts involved
Aux Trans Pump B, Pump Relay, Wiring Harness

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