Powertrain, generic · Hybrid propulsion
P0A23 Generator Torque Sensor Circuit Range/Performance
Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible
The generator torque sensor sends an electrically valid voltage, but the torque it reports does not fit the generator current, speed and engine load the control unit knows. Typical checks compare the measured value with a torque model or look for an offset while the generator is idle. Such a sensor can sit in the hollow generator shaft, as a Honda patent claims, where magnetic noise and ageing shift the reading. No manufacturer documents P0A23 publicly; CARB requires approved monitoring of generator faults. Pure wiring faults appear as P0A22, P0A24 or P0A25. The system tends to cap generator torque.
Likely causes
Sensor zero point or gain drifted
Electromagnetic interference from the generator or inverter
Contact resistance in the connector skewing the signal
Symptoms
- Hybrid system warning light
- Generator output limited, battery charges slowly
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
References: patents.google.com, law.cornell.edu.