Powertrain
generic / SAE
P0B01
Electric/Auxiliary Transmission Fluid Pump Motor Phase U Current Low
The phase U current of the auxiliary transmission fluid pump motor reports a current low fault. Pump phase commutation impaired.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / numberB / 01
Possible causes
- Phase winding partially open high
- Current sensor offset drifted medium
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
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 500–2500 €
- Estimated time: 2–8 h
- Component: aux trans pump motor phase u
- Component: wiring harness
- Component: tcm
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012