What it means
The generator rotor position sensor reports a circuit intermittent fault. Phase commutation cannot be controlled reliably.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
The generator position sensor provides rotor-angle feedback for hybrid phase control. This code is set when that feedback or its circuit cuts in and out, so generator position cannot be tracked consistently.
Common causes
Most likely first.
- Connector not seated
- Noisy ground reference
- Connector with intermittent contact under vibration
Symptoms
- Check-engine or hybrid-system warning light
- Intermittent hybrid performance
- Possible reduced-power mode
How to diagnose it
- Record freeze-frame data and review live generator position readings for drop-outs or spikes around the fault.
- Power down the hybrid system under the manufacturer's high-voltage safety procedure and verify the generator sensor connector is fully seated and locked.
- Inspect connector pins and harness strain points for corrosion, looseness, rubbed insulation, or damage that may interrupt contact under vibration.
- Test generator sensor ground stability and signal continuity using the manufacturer's procedure while gently moving the low-voltage harness.
- Compare generator position and speed data during a controlled operating check to identify brief signal interruptions.
- If the circuit remains stable, test the generator position sensor for an intermittent internal fault against the manufacturer's specification.
Common fixes
- Reseat and secure the generator position-sensor connector.
- Repair loose or corroded connector pins.
- Repair damaged wiring or an unstable sensor ground.
- Replace the generator position sensor if its output intermittently drops out with a sound harness.
Can I keep driving?
Stop driving if hybrid performance becomes intermittent, reduced-power mode appears, or shutdown is possible, because the fault may recur without warning. If no symptoms are present, keep use brief and avoid routes where a sudden change in propulsion would be hazardous.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.