P0A57Drive Motor B Current Sensor Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0A57 is set when the signal of the drive motor B current sensor stays below its valid range, usually from a signal line shorted to ground, a missing sensor supply or a failed Hall element. No manufacturer documents P0A57 publicly. A Toyota patent explains the risk of this failure: a sensor held in its ground-short range reports much less current than really flows, the current controller raises its output and can drive the inverter into overcurrent; the system described therefore opens the system relays and warns the driver once the condition repeats. CARB requires out-of-range checks for hybrid input components. P0A58 is the high side, P0A55 the general circuit code, P0A56 plausibility, P0A53 the same check on motor A. Motor B is shut down.
- What you may notice
- Hybrid warning and MIL
- Drive motor B or the whole high-voltage system switched off
- Likely causes
- LikelySensor signal line shorted to ground
- PossibleSensor supply voltage missing
- PossibleHall element of the current sensor failed
- 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: €300 – €4,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.