EVAP System Leak Detection Pump Sense Circuit Intermittent/Erratic

Where it lives

For P2407, the pump sits on the circuit this code reports. The description of P2407 reports a fault at the pump.

Check these first

• A loose connection at the leak detection pump sense connector
• A failing leak detection pump with an unstable output
• Chafed wiring grounding the pump sense signal
• Moisture tracked into the pump connector

What to do next

1. Watch the pump sense signal on a scan tool while wiggling the harness
2. Inspect the pump sense connector for loose pins
3. Check the harness for chafing or moisture
4. Test the pump output for stability
5. Replace the leak detection pump if the circuit checks good
6. Clear the code and retest

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