P0A19 code meaning
Motor Torque Sensor Circuit Low
Powertrain system Generic code P0Axx codes Check engine light
What P0A19 means
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.
P0A19 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 8 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0A19
- Hybrid system warning light
- Reduced electric drive power or electric drive disabled
- Engine runs more often, higher fuel consumption
Common causes of P0A19
- Most likelySensor signal or supply line shorted to ground
- PossibleSensor reference or excitation supply missing
- PossibleCorroded or loose connector at the drive unit
- Less likelyTorque sensor electronics failed, often replaced with the drive unit
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Motor torque sensorWiring harnessHybrid control module
What each part of P0A19 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| A | Area: hybrid propulsion. |
| 19 | The exact fault in that area. |
What to do next
- Note P0A19 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0A19
What does P0A19 mean?
P0A19 means "Motor Torque Sensor Circuit Low". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P0A19?
Drive gently and only to a workshop. With P0A19 the car can go into limp mode (reduced power) to protect itself.
Will P0A19 fail an emissions test?
Yes, it can. P0A19 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0A19 to fix?
Difficulty: hard. A typical repair takes 1 to 8 hours of work. This is a job for a workshop.
Will P0A19 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.