OBD-II code · Powertrain (generic, extended)

P2796 Electric/Auxiliary Transmission Fluid Pump A Control Circuit / Open

The controller cannot drive the first auxiliary transmission fluid pump. Pressure is lost during stop-start engine-off events.

Is it safe to drive with P2796?

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 A, Pump Relay, Wiring Harness

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