Powertrain
generic / SAE
P0B0B
Electric/Auxiliary Transmission Fluid Pump A Motor Supply Voltage Circuit High
The supply voltage circuit of auxiliary transmission fluid pump A motor reports a high 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.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / numberB / 0B
Possible causes
- Wire shorted to higher voltage high
- Alternator overvoltage medium
- Connector pins corroded - high contact resistance 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
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 200–1500 €
- Estimated time: 1–5 h
- Component: aux trans pump a motor
- Component: wiring harness
- Component: tcm
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012