Here is the definition and possible causes.
Possible causes
- 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
P0455 CHEVROLET Description
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.
Read more:
http://engine-codes.com/p0455_chevrolet.html#ixzz24fVfq0Bx
×