EVAP System Pressure Sensor/Switch A Circuit Low

Where it lives

For P0452, the sensor sits on the circuit this code reports. The description of P0452 reports a fault at the sensor.

Check these first

• A failed EVAP pressure sensor reading low
• A short to ground on the sensor signal wire
• Corrosion in the sensor connector
• A leaking EVAP hose
• A failed fuel tank pressure sensor

What to do next

1. Read the EVAP pressure sensor voltage on a scan tool
2. Check the sensor signal wire for a short to ground
3. Inspect the sensor connector for corrosion
4. Smoke test the EVAP system for a leak
5. Replace the sensor if the voltage stays low
6. Clear the code and retest

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