P0B05: Electric/Auxiliary Transmission Fluid Pump Motor Phase V Current High
What to do
As P0B02 — whether one phase or all three are flagged changes the likely repair.
What this code means
Phase V is drawing high current — shorts, or a pump being asked to turn something stiff. The one-phase-versus-three-phase distinction that separates those two is at P0B02; the family's argument is at P0B00.
Likely causes
Start here
- Faulty auxiliary transmission fluid pump · specialist
Less common
- Wiring shorted to voltage · moderate
- Seized pump motor · specialist
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
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