P0A56Drive Motor B Current Sensor Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Hybrid warning and MIL
- Reduced or missing drive from motor B
- Likely causes
- LikelyCurrent sensor offset drifted or offset learning disturbed
- PossibleCurrent sensor of drive motor B degraded
- RareElectrical interference on the sensor signal
- 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: €200 – €4,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.