P0450 - EVAPORATIVE EMISSION SYSTEM PRESSURE SENSOR / SWITCH MALFUNCTION

The EVAP (Evaporative Emissions Control System) is designed to stop fuel vapors before they are released into the atmosphere. A vented tank known as a canister is used to store these excess vapors in this system until they can be completely burned off in the proper condition.

The components of the EVAP System are the charcoal canister, pressure sensor, purge valve or solenoid, vent valve or solenoid. Besides that, there are some tubes and hoses that are routed from the fuel tank to the engine. The Evaporative Emissions Control System uses an engine vacuum to take fuel vapors to the intake manifold. These vapors are burned there so they cannot be expelled into the environment.

The EVAP Pressure Sensor that monitors system pressure is usually located in the fuel tank and is built into the fuel pump housing itself. If the tank or EVAP system pressure is out of the established limits for more than the allowed time, the P0450 OBDII diagnostic code will be set.

• Check Engine light ON
• Increases fuel consumption

Reasons for setting the P0450 OBD2 fault code:

• The fuel cap may be loose or faulty.
• The fuel tank pressure relief valve may be clogged.
• The EVAP System hoses or lines may be collapsed, disconnected, or in bad condition.
• The charcoal canister may be faulty.
• The Evaporative Emission Control System Pressure Sensor may be damaged.

To solve the DTC P0450 OBDII, try this:

• Check all the EVAP System hoses and lines for deficiencies or damage due to high temperatures.
• Check that the fuel cap and fuel seal are tightened properly. If it does not fit properly, replace it.
• Use a scanner to observe the EVAP Pressure Sensor data and check that it is within the manufacturer's specifications. If not, follow the manufacturer's recommendations for sensor testing and diagnostics. Replace it if it does not meet performance requirements.
• If the sensor has no inconsistencies, test the system circuits. Repair any shorts or open circuits.