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
Related codes
- P27A2Electric/Auxiliary Transmission Fluid Pump B Control Circuit / Open
- P2793Gear Shift Direction Circuit
- P2794Gear Shift Direction Circuit Low
- P2795Gear Shift Direction Circuit High
- P2797Electric/Auxiliary Transmission Fluid Pump A Performance/Stuck Off
- P2798Electric/Auxiliary Transmission Fluid Pump A Control Circuit Low
- P2799Electric/Auxiliary Transmission Fluid Pump A Control Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.