OBD-II code · Powertrain (generic)
P0A21 Motor Torque Sensor Circuit Intermittent
The drive motor torque sensor reports a circuit intermittent fault. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P0A21?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyConnector not seated
- PossibleNoisy ground reference
- Less likelyConnector with intermittent contact under vibration
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–7 h
- Emissions test
- Usually unaffected
- Parts involved
- Motor Torque Sensor, Wiring Harness, Hybrid Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.