OBD-II code · Powertrain (generic, extended)

P276B Electric/Auxiliary Transmission Fluid Pump B Motor Supply Voltage Circuit Low

The motor supply voltage of the second auxiliary transmission fluid pump is below the operating range.

Is it safe to drive with P276B?

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

Common causes

  • Most likelyHigh-resistance battery feed
  • PossibleWeak battery sags under pump current
  • 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
Medium
DIY friendly
Best left to a mechanic
Typical labour
0.8–3 h
Emissions test
Usually unaffected
Parts involved
Aux Trans Pump B, Supply Circuit, Battery

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