Powertrain, generic · Hybrid propulsion

P0A22 Generator Torque Sensor Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

In series or power-split hybrids a separate electric machine runs as generator, driven by the combustion engine. A Honda patent claims a torque sensor inside the hollow shaft of either the traction motor or this generator. P0A22 is the general circuit fault of the generator torque sensor: the control unit receives no usable signal at all, without a more specific low, high or intermittent pattern. No manufacturer documents P0A22 publicly; CARB requires an approved monitoring plan for the generator system. Related: P0A23 plausibility, P0A24 low, P0A25 high, P0A26 intermittent. Charging and engine-driven power generation may be limited.

Likely causes

Sensor connector at the generator unplugged, loose or corroded
Open circuit in the sensor harness
Generator torque sensor or its electronics failed

Symptoms

  • Hybrid system warning light
  • Reduced battery charging by the engine
  • Limited system power

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

P0A23P0A24P0A25P0A26P0A17

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