In series or power-split hybrids a separate electric machine runs as generator, driven by the combustion engine. A Honda patent claims a torque sensor inside the hollow shaft of either the traction motor or this generator. P0A22 is the general circuit fault of the generator torque sensor: the control unit receives no usable signal at all, without a more specific low, high or intermittent pattern. No manufacturer documents P0A22 publicly; CARB requires an approved monitoring plan for the generator system. Related: P0A23 plausibility, P0A24 low, P0A25 high, P0A26 intermittent. Charging and engine-driven power generation may be limited.
Medium severity. Can I keep driving?If the battery warning light comes on, you could get stranded. Turn off electrical accessories and go straight to a repair shop.
Symptoms
- Hybrid system warning light
- Reduced battery charging by the engine
- Limited system power
Most likely causes
- Sensor connector at the generator unplugged, loose or corroded
- Open circuit in the sensor harness
- Generator torque sensor or its electronics failed
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: hard
- It can trigger limp mode.
- It affects emissions.
What each character of P0A22 means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- A: Hybrid or air and fuel
- 22: Specific fault in that system
Frequently asked questions
Can I keep driving with code P0A22?
If the battery warning light comes on, you could get stranded. Turn off electrical accessories and go straight to a repair shop.
What causes code P0A22?
The most common causes are: sensor connector at the generator unplugged, loose or corroded; open circuit in the sensor harness; generator torque sensor or its electronics failed.
Related codes
- P0A23Generator Torque Sensor Circuit Range/Performance
- P0A24Generator Torque Sensor Circuit Low
- P0A25Generator Torque Sensor Circuit High
- P0A26Generator Torque Sensor Circuit Intermittent
- P0A17Motor Torque Sensor Circuit
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.