OBD-II code · Powertrain (generic, extended)
P27E1 Electric/Auxiliary Transmission Fluid Pump A Pressure Too Low
The auxiliary transmission fluid pump A produces less pressure than expected for the commanded duty. Pump aging, leakage, or fluid loss.
Is it safe to drive with P27E1?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyPump worn or leaking internally
- PossibleTransmission fluid level low
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
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–7 h
- Emissions test
- Usually unaffected
- Parts involved
- Aux Transmission Pump A, Transmission Fluid, Valve Body
Related codes
- P27E2Electric/Auxiliary Transmission Fluid Pump B Pressure Too Low
- P27DEPressure Control Solenoid T Control Circuit Range/Performance
- P27DFPressure Control Solenoid T Control Circuit Low
- P27E0Pressure Control Solenoid T Control Circuit High
- P27E3Electric/Auxiliary Transmission Fluid Pump Control Valve Circuit/Open
- P27E4Electric/Auxiliary Transmission Fluid Pump Control Valve Circuit Range/Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.