Staff Answer
Jun 24, 2026 - 09:13 PM
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The P2400 code indicates an Evaporative Emission (EVAP) System Leak Detection Pump Control Circuit Open. This means the Engine Control Module (ECM) has detected a break in the electrical circuit that controls the pump used to test the fuel system for vapor leaks.
Common Troubleshooting Steps:
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Check the Pump Connector: Inspect the electrical plug at the leak detection pump for disconnected wires, loose pins, or heavy corrosion.
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Inspect the Wiring: Trace the wiring harness from the pump back toward the ECM, looking for breaks, chafing, or burnt sections.
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Test the Pump Solenoid/Motor: Use a multimeter to check the pump’s internal resistance. If the circuit shows "infinite" resistance, the internal coil or motor is likely open and the pump requires replacement.
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Check the Fuse: Verify that the fuse powering the EVAP leak detection system is intact.
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