P0A20Motor Torque Sensor Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- This code covers the upper electrical limit of a torque sensor fitted to the traction motor shaft, for example the magnetostrictive design inside a hollow output shaft described in a Honda patent. The control unit sets P0A20 when the sensor voltage remains above the valid range for a calibrated time, which points to a short to the supply voltage, an open ground return or a sensor output stuck high. No manufacturer documents P0A20 publicly; CARB requires an approved drive motor monitor. Siblings: P0A19 low, P0A18 implausible torque, P0A21 intermittent, P0A17 general circuit. Expect a hybrid warning and limited electric torque.
- What you may notice
- Hybrid system warning light
- Electric drive torque limited
- Reduced acceleration in electric mode
- Likely causes
- LikelySignal line shorted to sensor supply or battery voltage
- PossibleOpen sensor ground return
- RareSensor electronics output stuck high
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €3,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.