Universal (All Makes) Vehicle (OBD-II)
Severity:Common Causes
- map[cause:Broken or disconnected wire in the leak detection pump circuit]
- map[cause:Blown fuse supplying power to the EVAP pump]
- map[cause:Failed leak detection pump with an open internal circuit]
- map[cause:Corroded connector at the pump harness]
- map[cause:Failed ECM relay or driver for the EVAP pump circuit]
How to Fix It
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Check the fuse for the EVAP system — replace if blown.
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Locate the leak detection pump and inspect its wiring harness.
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Test for power and ground at the pump connector with a multimeter.
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Check circuit continuity from the pump connector back to the ECM.
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Replace the leak detection pump if it has an open internal circuit.
Frequently Asked Questions
Can I drive with P2400?
Yes, this code does not affect how the car drives. But the check engine light will stay on. Fix it before your next emissions test.
Where is the leak detection pump located?
Usually near the charcoal canister in the EVAP system. On most vehicles it's under the hood or near the fuel tank. Check a service manual for your specific vehicle.
How much does a leak detection pump cost?
Aftermarket pumps typically cost $30–$120. Dealer parts can be higher. Labor is usually minimal as the pump is easy to access.