P0A56 code meaning
Drive Motor B Current Sensor Circuit Range/Performance
Powertrain system Generic code P0Axx codes Check engine light
What P0A56 means
P0A56 means the current sensor of drive motor B delivers electrically valid values that do not match the operating state, for example a zero-current offset outside its band or a reading that disagrees with a redundant sensor. No manufacturer documents P0A56 publicly. A Hyundai patent covering both the traction motor and the starter-generator flags an abnormal offset compensation by comparing an estimated power-module temperature with the measured inverter temperature; a Caterpillar patent checks that the phase currents of a motor add up to roughly zero. CARB requires rationality checks of hybrid input components. P0A55 is the general circuit fault, P0A57/P0A58 the hard low and high signal, P0A52 the motor A counterpart. Motor B is limited or switched off.
P0A56 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 P0A56
- Hybrid warning and MIL
- Reduced or missing drive from motor B
Common causes of P0A56
- Most likelyCurrent sensor offset drifted or offset learning disturbed
- PossibleCurrent sensor of drive motor B degraded
- Less likelyElectrical interference on the sensor signal
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 P0A56 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. |
| 56 | The exact fault in that area. |
What to do next
- Note P0A56 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 P0A56
What does P0A56 mean?
P0A56 means "Drive Motor B Current Sensor Circuit Range/Performance". P0A56 means the current sensor of drive motor B delivers electrically valid values that do not match the operating state, for example a zero-current offset outside its band or a reading that disagrees with a redundant sensor. It is a generic code, so it means the same on every make.
Is it safe to drive with P0A56?
Drive gently and only to a workshop. With P0A56 the car can go into limp mode (reduced power) to protect itself.
Will P0A56 fail an emissions test?
Yes, it can. P0A56 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 P0A56 to fix?
Difficulty: workshop only. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P0A56 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.