EVAP System Pressure Sensor/Switch C Circuit Low

Where it lives

For P2B7C, the circuit described runs through the sensor. The description of P2B7C reports a fault at the sensor.

Check these first

• A failing EVAP pressure sensor C giving a low signal
• Corrosion or damage in the sensor C wiring or connector
• A short to ground on the sensor C signal circuit
• A loose or leaking fuel cap dropping system pressure
• A clogged or stuck EVAP vent or purge path

What to do next

1. Check the EVAP pressure sensor C connector for corrosion or water
2. Test the sensor C signal circuit for a short to ground
3. Check for a loose, damaged or missing fuel cap
4. Read EVAP system pressure with a scan tool and compare it to spec
5. Replace EVAP pressure sensor C if the signal stays low
6. Clear the code and retest

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