Cause
Faulty motor current sensor
The sensors watching each motor phase's current from inside the inverter assembly — measurement and self-protection in one part, since phase current is both how the inverter knows its delivered torque and how it detects an overcurrent before its own silicon melts.
Their characteristic failure is drift rather than death. At power-on every phase should read exactly zero; a sensor whose zero has drifted with age and heat fails that check while working normally otherwise, which is why these faults are so often caught silently at start-up rather than felt on the road. A drifted sensor can also impersonate a real phase fault — reporting imbalance in a healthy machine — which is how healthy motors and inverters end up condemned.
Because the sensors live inside the inverter, replacement is inverter work in practice; their external signal wiring is the half a workshop can reach, and it is checked first.
Typically specialist work. Needs equipment or training most home workshops do not have.
Codes this can cause (59)
Codes where this is a likely explanation first, rather than merely a possible one.
- P0A52 Drive Motor A Current Sensor Circuit Range/Performance Likely for this code Moderate
- P0A56 Drive Motor B Current Sensor Circuit Range/Performance Likely for this code Moderate
- P0A5A Generator Current Sensor Circuit Range/Performance Likely for this code Moderate
- P0BE5 Drive Motor A Phase U Current Sensor Circuit Likely for this code High
- P0BE6 Drive Motor A Phase U Current Sensor Circuit Range/Performance Likely for this code Moderate
- P0BE7 Drive Motor A Phase U Current Sensor Circuit Low Likely for this code Moderate
- P0BE8 Drive Motor A Phase U Current Sensor Circuit High Likely for this code Moderate
- P0BE9 Drive Motor A Phase V Current Sensor Circuit Likely for this code High
- P0BEA Drive Motor A Phase V Current Sensor Circuit Range/Performance Likely for this code Moderate
- P0BEB Drive Motor A Phase V Current Sensor Circuit Low Likely for this code Moderate
- P0BEC Drive Motor A Phase V Current Sensor Circuit High Likely for this code Moderate
- P0BED Drive Motor A Phase W Current Sensor Circuit Likely for this code High
- P0BEE Drive Motor A Phase W Current Sensor Circuit Range/Performance Likely for this code Moderate
- P0BEF Drive Motor A Phase W Current Sensor Circuit Low Likely for this code Moderate
- P0BF0 Drive Motor A Phase W Current Sensor Circuit High Likely for this code Moderate
- P0BF1 Drive Motor B Phase U Current Sensor Circuit Likely for this code High
- P0BF2 Drive Motor B Phase U Current Sensor Circuit Range/Performance Likely for this code Moderate
- P0BF3 Drive Motor B Phase U Current Sensor Circuit Low Likely for this code Moderate
- P0BF4 Drive Motor B Phase U Current Sensor Circuit High Likely for this code Moderate
- P0BF5 Drive Motor B Phase V Current Sensor Circuit Likely for this code High
- P0BF6 Drive Motor B Phase V Current Sensor Circuit Range/Performance Likely for this code Moderate
- P0BF7 Drive Motor B Phase V Current Sensor Circuit Low Likely for this code Moderate
- P0BF8 Drive Motor B Phase V Current Sensor Circuit High Likely for this code Moderate
- P0BF9 Drive Motor B Phase W Current Sensor Circuit Likely for this code High
- P0BFA Drive Motor B Phase W Current Sensor Circuit Range/Performance Likely for this code Moderate
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