P2404 Fault Code

Evaporative Emission System Leak Detection Pump Sense Circuit Range/Performance

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

The P2404 fault code indicates an issue with the Evaporative Emission System Leak Detection Pump Sense Circuit. This system helps prevent fuel vapors from escaping into the atmosphere, ensuring that the vehicle complies with environmental regulations. When there is a problem in the sensor circuit range or performance, it can lead to incorrect readings, affecting the overall functionality of the EVAP system.

What are the symptoms of the P2404 code?

Drivers may experience various symptoms associated with the P2404 code, such as:

• Activated check engine light.
• Decreased fuel efficiency due to improper evaporation system performance.
• Fuel odors indicating potential leaks in the EVAP system.
• Unusual engine behavior or performance issues in certain conditions.

What causes the P2404 code?

Several factors could lead to this fault code being triggered, including:

• Faulty leak detection pump or its sensor.
• Damaged wiring or connectors in the evaporative emission system.
• Poor connections leading to intermittent signals.
• Electronic control module (ECM) malfunctions.
• Blockage in the system causing pressure issues.

How to fix P2404?

To resolve the P2404 code, follow these steps:

• Inspect the leak detection pump and associated wiring for any signs of damage or corrosion.
• Test the pump and sensor for proper operation and replace if faulty.
• Check the continuity and connections in the sensor circuit.
• If necessary, consider reprogramming or replacing the ECM if it is determined to be faulty.
• Reset the fault codes and perform a leak test to ensure the problem has been resolved.