P0A19Motor Torque Sensor Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- The control unit watches the voltage of a torque sensor that measures load directly on the traction motor shaft, such as the magnetostrictive sensor in a hollow motor shaft shown in a Honda patent. P0A19 sets when the signal stays below its valid window for a calibrated time, typical of a short to ground, a broken supply or an open signal line pulled low. No manufacturer documents P0A19 publicly; CARB only requires an approved drive motor monitoring plan. P0A20 is the opposite fault, P0A18 a plausible voltage with wrong torque, P0A21 dropouts. The driver usually sees a hybrid warning and reduced electric drive power.
- What you may notice
- Hybrid system warning light
- Reduced electric drive power or electric drive disabled
- Engine runs more often, higher fuel consumption
- Likely causes
- LikelySensor signal or supply line shorted to ground
- PossibleSensor reference or excitation supply missing
- PossibleCorroded or loose connector at the drive unit
- RareTorque sensor electronics failed, often replaced with the drive unit
- 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.