Alternative Fuel Rail Temperature Sensor Circuit Intermittent/Erratic

Where it lives

For P01B8, the sensor sits on the circuit this code reports. The description of P01B8 reports a fault at the sensor.

Check these first

• A loose alternative fuel rail temperature sensor connector
• Chafed wiring on the sensor circuit
• A failing rail temperature sensor
• Water intrusion in the sensor connector
• A poor ground on the sensor circuit

What to do next

1. Wiggle test the sensor harness on live data
2. Inspect the sensor wiring for chafing
3. Check the connector for water intrusion
4. Replace the alternative fuel rail temperature sensor if erratic
5. Clean the connector and ground
6. Clear the code and retest

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