P0A6BDrive Motor B Phase V Current High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0A6B is stored when phase V of drive motor B reports more current than the operating state allows. No manufacturer documents P0A6B publicly. Two causes must be told apart: a real overcurrent from a shorted switch, a winding fault or an insulation breakdown, and a sensor that reads high because its gain or zero offset has drifted. Patents show how inverters separate them: Toyota compares a control sensor against a monitoring sensor and the commanded current, Caterpillar checks that the three phase currents still sum to about zero. CARB requires plausibility monitoring of electric drive components. P0A6A is the low side, P0A68 and P0A6E the U and W phases, P0A62 the motor A counterpart. The inverter shuts motor B down to protect itself.
- What you may notice
- Hybrid warning and MIL
- Motor B cut out, reduced acceleration
- Likely causes
- LikelyPhase V current sensor gain or offset drifted high
- PossibleShorted power switch in the phase V leg
- PossibleWinding or insulation fault in phase V of motor B
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €400 – €7,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.