P0A17Motor Torque Sensor Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Some electric drive units measure the torque on the motor or generator shaft directly, for example with a magnetostrictive sensor inside a hollow motor shaft as described in Honda patents for hybrid drive systems. The control unit uses that value to check the torque it commands. P0A17 is the general circuit fault of this sensor, set when the signal is missing or cannot be evaluated at all. No manufacturer documents P0A17 publicly. CARB requires a monitoring plan for drive motor faults that affect propulsion or emission strategies, which covers such feedback sensors. Plausibility is P0A18, low and high P0A19 and P0A20, intermittent P0A21. Expect reduced electric power and a hybrid warning.
- What you may notice
- Hybrid system warning light
- Electric drive power limited or electric drive disabled
- Higher fuel consumption because the engine runs more often
- Likely causes
- LikelyLoose or corroded sensor connector at the drive unit
- PossibleDamaged sensor wiring between drive unit and control module
- PossibleTorque sensor or its excitation electronics failed, often only replaceable with the drive unit
- RareInput stage of the hybrid or motor control module faulty
- 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.