P0A4B
Generator Position Sensor Circuit
The generator rotor position sensor reports a circuit fault. Phase commutation cannot be controlled reliably.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Position sensor failedCommon
- Wiring faultPossible
Parts involved
- Generator Position Sensor
- Wiring Harness
- Hybrid Control Module
P0A4B 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.