P0BFE: Drive Motor B Phase U-V-W Current Sensor Correlation
What to do
The code names three sensors and blames none of them — there is a real test to find which is at fault, and "the code mentions all three" is not it. Ask how the faulty one was identified before three parts are fitted. Expect all-wheel drive to be unavailable in the meantime.
What this code means
The three phase current sensors on drive motor B are not telling a consistent story.
The check behind this code is one of the most elegant in the corpus, and it costs the module nothing. In a three-phase machine with no neutral connection, current has nowhere to go except in and out through the three phases — so at every instant the three phase currents must add up to zero. Whatever flows in through one or two must flow out through the others.
That means the module does not need a reference or a known-good sensor to audit its measurements. It simply adds them up. If the total is not zero, at least one of the three is lying, and no amount of the motor being healthy will make the sum come right.
What the code cannot do is say which one — the same honesty as the battery current correlation at P0B13. It reports an inconsistency, not a verdict, and picking the faulty sensor needs a third opinion: comparing each against a clamp meter, or against the current the inverter believes it is commanding. Replacing all three because the code names all three is common and usually two-thirds wasted.
Motor B is typically the second machine, so expect all-wheel drive to be lost rather than the vehicle.
Likely causes
Start here
- Faulty motor current sensor · specialist
- Corroded or loose connector · easy
Less common
- Faulty power inverter · specialist
- Damaged high voltage phase cable or terminal · specialist
Symptoms
Components involved
Information, not instruction
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Community experience
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