P2400 Fault Code

Evaporative Emission System Leak Detection Pump Control Circuit/Open

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2400 fault code indicates a problem with the Evaporative Emission System Leak Detection Pump Control Circuit/Open. This system is designed to prevent fuel vapors from escaping into the atmosphere by using a pump to detect even the smallest leaks in the EVAP system. When this code is triggered, it typically means that the control circuit for the leak detection pump is open, which can lead to issues with emissions and vehicle performance.

What are the symptoms of the P2400 code?

Symptoms associated with the P2400 code may include:

• Illuminated Check Engine Light (CEL).
• Unusual fuel consumption or decreased fuel efficiency.
• Failed emissions test.
• Unresponsive leak detection pump when tested.
• Possible rough idling or stalling if other systems are affected.

What causes the P2400 code?

The most common causes of the P2400 code include:

• A faulty leak detection pump that fails to activate.
• Damaged wiring or connectors within the control circuit.
• A blown fuse associated with the leak detection pump.
• An open circuit due to broken or corroded wires.
• ECM (Engine Control Module) issues affecting the control signal.

How to fix P2400?

To resolve a P2400 fault code, follow these steps:

• Inspect the electrical connections and wiring harness for any visible damage or corrosion.
• Test the leak detection pump for proper operation and replace it if faulty.
• Check the relevant fuses and replace any that are blown.
• Clear the codes using an OBD-II scanner and monitor for recurrence.
• If the code persists, consider checking the ECM for proper operation and potential reprogramming.