Generator Position Sensor Circuit Intermittent/Erratic
The P0C68 code indicates an intermittent or erratic signal from the generator position sensor circuit in a hybrid or electric vehicle. This sensor monitors the rotor position of the generator (MG1) to ensure proper power generation and hybrid system operation. An erratic signal can cause the hybrid control module to miscalculate generator output, leading to reduced performance, charging issues, or system shutdown.
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy or electric range
- Hybrid system warning messages on dashboard
- Vehicle may enter limp mode or fail to start
2. Most Common Causes
- Faulty generator position sensor
- Damaged wiring or connectors in the sensor circuit
- Intermittent short or open in the sensor harness
- Failed hybrid control module (rare)
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data.
Step 2: Visually inspect the generator position sensor and wiring for damage or corrosion.
Step 3: Test sensor resistance and signal voltage with a multimeter per manufacturer specs.
Step 4: Check for intermittent connection by wiggling harness while monitoring signal.
Step 5: If sensor and wiring are good, test the hybrid control module output.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The vehicle may lose hybrid assist or stall, potentially causing a safety hazard.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, including parts and labor, depending on the cause and vehicle model.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.