P2418 - EVAPORATIVE EMISSION SYSTEM SWITCHING VALVE CONTROL CIRCUIT/OPEN

The EVAP system (The evaporative emission control system) ensures that the fuel system of the vehicle is sealed in such a way as to prevent the escape of vapors from the tank into the atmosphere. This system protects the atmosphere from the pollutants resulting from the vapors produced.  This system has a pump, which detects internal leaks inside the tank. Once the ignition switch is turned off, a negative pressure or vacuum is created in the EVAP system.

The Powertrain Control Module (PCM) constantly checks the system for such leaks. If it determines that the pump has failed to activate as required, or that vacuum was not created as required, a DTC P2418 OBDII code will be stored.

• Check Engine lamp illuminated.

The reasons for the P2418 OBD2 fault code setting are:

• The fuel cap is possibly not installed correctly.
• Evaporative Emission Control System may have damage to wiring, connectors, or vapor hoses.
• The EVAP system solenoid could be defective.
• The evaporative switching valve may be in bad condition.

The steps to troubleshoot the P2418 OBDII diagnostic code are:

• Check the EVAP wiring and connectors for common damage. If you detect burn spots, corrosion, or wear on them, proceed to repair or replace them as required.
• Check vacuum lines and hoses for obstructions or wear damage. Make appropriate corrections.
• Consult the service manual for the manufacturer's advice on how to activate the EVAP leak detection pump. After activation, use a scanner to check the pump voltage. Check that the reference voltage and ground signal are appropriate for proper system performance. Repair it as needed.