OBD-II code · Powertrain (generic, extended)

P276C Electric/Auxiliary Transmission Fluid Pump B Motor Supply Voltage Circuit High

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

Is it safe to drive with P276C?

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

Common causes

  • Most likelyAlternator regulator failed to limit output
  • Less likelyWiring shorted to a higher-voltage circuit
  • 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
1–3.5 h
Emissions test
Usually unaffected
Parts involved
Aux Trans Pump B, Supply Circuit, Charging System

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