P2403 Fault Code

Evaporative Emission System Leak Detection Pump Sense Circuit/Open

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

The P2403 fault code refers to a problem within the Evaporative Emission System, specifically indicating an issue with the leak detection pump's sense circuit, which may be open or interrupted. This system is designed to prevent the release of fuel vapors into the atmosphere, and a malfunction can lead to increased emissions and fuel inefficiency.

What are the symptoms of the P2403 code?

Drivers may notice several symptoms when this code is active:

• Check Engine Light illuminated on the dashboard.
• Possible increase in fuel consumption due to inefficient emissions handling.
• Fumes or strong odors from the fuel tank area when the vehicle is running.
• Potentially failed emissions test if the vehicle is being inspected.

What causes the P2403 code?

Several factors can lead to a P2403 code being triggered:

• A faulty leak detection pump that cannot sense pressure correctly.
• Broken or damaged wiring in the sense circuit.
• Poor electrical connections, such as corroded or loose connectors.
• A defective Engine Control Module (ECM) that fails to process signals correctly.

How to fix P2403?

To resolve a P2403 fault code, the following steps can be taken:

• Inspect the wiring and connections related to the leak detection pump for damage or corrosion.
• Replace the leak detection pump if it is found to be faulty.
• Clear the fault codes and run a full system test to see if the code returns.
• Ensure the ECM is functioning correctly and update if necessary.