- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking

The P0455 it’s a very common code, because the code is set if the gas cap is loose or missing. Start by tighten the gas cap and clearing the code. In most cases the code can be clear by disconnecting the car battery for about 30 minutes.

Evaporative Emission System (EVAP) control system has a very large leak such as fuel filler cap fell off, EVAP control system does not operate properly.

- Engine Light ON (or Service Engine Soon Warning Light)
- Possible a noticeable fuel odor caused by the release of fuel vapors

This diagnosis detects leaks in the Evaporative Emission System (EVAP) purge line using engine intake manifold vacuum. If pressure does not increase, the Engine Control Module (ECM) will check for leaks in the line between the fuel tank and EVAP canister purge volume control solenoid valve under the following vacuum test condition.
The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. The EVAP canister vent control valve will then be closed to shut the EVAP purge line off. The EVAP canister purge volume control solenoid valve is opened to depressurize the EVAP purge line using intake manifold vacuum. After this depressurization is implemented, the EVAP canister purge volume control solenoid valve will be closed.

P0455 CHEVROLET
P0455 FORD
P0455 INFINITI
P0455 NISSAN
P0455 CHRYSLER
P0455 DODGE
P0455 JEEP
P0455 ACURA
P0455 HONDA
P0455 ISUZU
P0455 HYUNDAI
P0455 KIA
P0455 LEXUS
P0455 SCION
P0455 TOYOTA
P0455 MAZDA
P0455 MITSUBISHI
P0455 VOLKSWAGEN
P0455 AUDI
P0455 2001 DODGE CARAVAN
P0455 BUICK
P0455 CADILLAC
P0455 GMC
P0455 PONTIAC
P0455 SATURN