Powertrain, generic · Hybrid propulsion

P0A25 Generator Torque Sensor Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

With P0A25 the control unit sees the generator torque sensor signal above its permitted upper limit for longer than the calibrated debounce time. The common electrical explanations are a short from the signal line to the supply or battery voltage, an interrupted sensor ground, or a sensor output stuck at its maximum. The sensor belongs to the engine-driven generator of a hybrid; a Honda patent shows torque sensing inside a hollow generator or motor shaft. No manufacturer documents P0A25 publicly; CARB only demands an approved generator monitor. Opposite fault: P0A24; plausibility: P0A23; intermittent: P0A26. Generator torque is usually limited.

Likely causes

Signal line shorted to supply or battery voltage
Open sensor ground
Sensor output stuck high

Symptoms

  • Hybrid system warning light
  • Generator output limited

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–3,000
Time1–8 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

generator torque sensorwiring harnesshybrid control module

Related codes

P0A22P0A23P0A24P0A26P0A20

References: patents.google.com, law.cornell.edu.