OBD-II code · Powertrain (generic)
P0B0A Electric/Auxiliary Transmission Fluid Pump A Motor Supply Voltage Circuit Low
The supply voltage circuit of auxiliary transmission fluid pump A motor reports a low condition. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P0B0A?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyWire shorted to ground
- PossibleSupply rail collapsed
- 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
- 1–5 h
- Emissions test
- Usually unaffected
- Parts involved
- Aux Trans Pump A Motor, Wiring Harness, Tcm
Related codes
- P276BElectric/Auxiliary Transmission Fluid Pump B Motor Supply Voltage Circuit Low
- P0B07Electric/Auxiliary Transmission Fluid Pump Motor Phase W Current Low
- P0B08Electric/Auxiliary Transmission Fluid Pump Motor Phase W Current High
- P0B09Electric/Auxiliary Transmission Fluid Pump A Motor Supply Voltage Circuit/Open
- P0B0BElectric/Auxiliary Transmission Fluid Pump A Motor Supply Voltage Circuit High
- P0B0CElectric/Auxiliary Transmission Fluid Pump A Hydraulic Leakage
- P0B0DElectric/Auxiliary Transmission Fluid Pump Motor Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.