P1450 - FAULT CODE - OBD2

P1450 FORD, LINCOLN, MERCURY: UNABLE TO BLEED UP FUEL TANK VACUUM

The Evaporative Emission Control System (EVAP) is used to prevent gasoline vapors from being expelled into the atmosphere from the fuel tank and injection system. Sealing the fuel tank is not a simple task. On the one hand, the tank requires some kind of ventilation to get air in to replace the fuel as it is sucked in by the fuel pump and sent to the engine. If the tank was hermetically sealed, the pump would create a negative suction pressure that would collapse the tank.

In older EVAP systems, the tank is ventilated by a spring-loaded valve installed in the gas cap. In the newest models, ventilation is achieved by the EVAP cartridge. The PCM (Powertrain Control Module) or ECM (Engine Control Module) maintains constant monitoring of the fuel vapor and pressure in the tank to verify the performance of the system is suitable.

The DTC P1450 OBDII code is a manufacturer-specific code used by Ford, Lincoln, and Mercury to indicate that the control module, after running the system monitor, detects excessive vacuum in the fuel tank or EVAP.

• Check Engine light on.
• The motor may have an unstable operation.

The reasons for setting the fault code P1450 OBD2 are

• The gas cap may be stuck in a closed position preventing vacuum relief.
• The hoses between the fuel tank and the canister valve may be damaged.
• The EVAP pump or vent solenoid may be blocked.
• The Fuel Tank Pressure Sensor (FTP) may be defective.

To solve the diagnostic code P1450 OBDII, you must do the following:

• Check out the TSB.
• By using a scanning tool, check if other DTCs are set. The diagnosis of these should be following the order shown in the tool.
• Check that the fuel tank cap is not stuck causing the vacuum relief to failing. Make the appropriate adjustments.
• Check the condition of the hoses between the canister and the fuel tank. Check that none of these have any common damage. Repair as required.
• Check the proper functioning of the EVAP system, paying close attention to the pump and the venting solenoid. Diagnose these components and make corrections if necessary.