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P0A51

Drive Motor A Current Sensor Circuit

The current sensor of the drive motor A reports a circuit fault. Current measurement is unreliable. The drive motor's position, current and temperature are watched continuously; a fault here downgrades the inverter to a safe operating point or triggers torque reduction.

  • Check engine light: Yes
  • Emissions related: No
  • Repair difficulty: hard

Symptoms

  • EV/hybrid system warning light on
  • Reduced motor power or torque
  • Possible limp mode or vehicle shutdown

Common causes

Ordered by how often each turns out to be the cause.

  • Current sensor failedCommon
  • Wiring faultPossible

Parts involved

  • Drive Motor A Current Sensor
  • Wiring Harness
  • Hybrid Control Module

P0A51 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.