OBD-II code · Powertrain (generic, extended)
P27A2 Electric/Auxiliary Transmission Fluid Pump B Control Circuit / Open
The controller cannot drive the second auxiliary transmission fluid pump.
Is it safe to drive with P27A2?
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 B, Pump Relay, Wiring Harness
Related codes
- P2796Electric/Auxiliary Transmission Fluid Pump A Control Circuit / Open
- P279FFour Wheel Drive (4WD) Range Signal Circuit Low
- P27A0Four Wheel Drive (4WD) Range Signal Circuit High
- P27A1Electric/Auxiliary Transmission Fluid Pump A Stuck On
- P27A3Electric/Auxiliary Transmission Fluid Pump B Performance/Stuck Off
- P27A4Electric/Auxiliary Transmission Fluid Pump B Control Circuit Low
- P27A5Electric/Auxiliary Transmission Fluid Pump B Control Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.