OBD-II code · Powertrain (generic, extended)

P277D Electric/Auxiliary Transmission Fluid Pump B Motor Over Temperature

The second auxiliary transmission fluid pump motor has reached over-temperature. Sustained high duty or insufficient cooling.

Is it safe to drive with P277D?

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

Common causes

  • Most likelySustained high duty cycle
  • PossibleCooling air or fluid path blocked

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
1–3.5 h
Emissions test
Usually unaffected
Parts involved
Aux Trans Pump B, Pump Motor

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