What P0A20 means
Motor Torque Sensor Circuit High
How to diagnose
- Read freeze frame data. When P0A20 set, your ECU snapshotted every sensor at that moment. This tells you what the car was doing when the fault triggered — RPM, load, coolant temp, throttle position, fuel trims. Almost always enough info to figure out the cause without further testing.
- Check for related codes. If you have P0A20 plus other codes, fix the earliest one in the chain first — a single root cause often triggers multiple codes.
- Cheap fixes first. For most codes, the order is: inspect connectors + wiring (free), check for vacuum leaks (cheap), replace sensor (moderate), replace mechanical part (expensive). Follow that ladder before dropping money on parts.
Manufacturer-specific descriptions
Different manufacturers use P0A20 for slightly different failure modes:
| BMW | Motor Torque Sensor Circuit High P0A21 Motor Torque Sensor Circuit Intermittent P0A22 Generator Torque Sensor Circuit P0A23 Generator Torque Sensor Circuit Range/Performance P0A24 Generator Torque Sensor Circuit Low P0A25 Generator Torque Sensor Circuit High P0A26 Generator Torque Sensor Circuit Intermittent P0A27 Battery Power Off Circuit P0A28 Battery Power Off Circuit Low P0A29 Battery Power Of... |
Read P0A20 on your own car
DIY Fix My Car reads P0A20 plus 25,000+ other DTC codes with manufacturer-specific descriptions. Includes freeze frame data, likely fix parts, and AI mechanic chat. Download free.