P0A57 code meaning
Drive Motor B Current Sensor Circuit Low
Powertrain system Generic code P0Axx codes Check engine light
What P0A57 means
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.
P0A57 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 6 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0A57
- Hybrid warning and MIL
- Drive motor B or the whole high-voltage system switched off
Common causes of P0A57
- Most likelySensor signal line shorted to ground
- PossibleSensor supply voltage missing
- PossibleHall element of the current sensor failed
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Drive motor b current sensorWiring harnessHybrid control module
What each part of P0A57 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| A | Area: hybrid propulsion. |
| 57 | The exact fault in that area. |
What to do next
- Note P0A57 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0A57
What does P0A57 mean?
P0A57 means "Drive Motor B Current Sensor Circuit Low". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P0A57?
Drive gently and only to a workshop. With P0A57 the car can go into limp mode (reduced power) to protect itself.
Will P0A57 fail an emissions test?
Yes, it can. P0A57 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0A57 to fix?
Difficulty: workshop only. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P0A57 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.