P0A1C
Drive Motor A Phase U Current Sensor Circuit
The motor controller detects an electrical fault on the phase U current sensor of drive motor A. Phase current sensing is required for vector control of the synchronous machine.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: shop_only
Symptoms
- EV/hybrid system warning light on
- Reduced motor power or torque
- Possible limp mode or vehicle shutdown
Common causes
Ordered by how often each turns out to be the cause.
- Current sensor failedCommon
- Inverter internal faultPossible
Parts involved
- Drive Motor A
- Phase Current Sensor
- Inverter
P0A1C is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.