P0442 - Evaporative Emissions System Leak Detected (Small Leak)
P0455 - Evaporative Emissions System Leak Detected (Gross Leak)
This diagnosis detects leaks in the EVAP purge line using engine intake manifold vacuum. If pressure does not increase, the 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.
Causes:
- Missing Fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- Incorrect fuel tank vacuum relief valve
- Leak is in line between intake manifold
Solutions:
- Re-tighten or replace fuel tank filler cap
- Replace damaged or leaking EVAP canister
- Replace damaged or leaking lines.
SOURCE: Codes PO 442, 449 and 455
Check all vacuum lines from the gas tank to the evaporative charcoal cannister by the gas tank and to the purge valve located at the engine. Check the electrical connector at the vent solenoid which should be located on the charcoal cannister and purge valve solenoid by the intake manifold.
SOURCE: code 442 cleared it now code 455 whats up
there is a leak within the evap solenoid and lines.find the leak with a smoke tester.
SOURCE: I have a code PO 442, PO 455 in my 2003 dodge
The p0442 is a moderate leak in the EVAP control system and p0455 is a large leak in the EVAP control system. First thing is to ensure that your filler cap is on tight and that the seal is effective. Next is to check the tubing of the EVAP system for any holes or disconnections. The P1404 is the valve in your EGR (exhaust gas recirculation) is staying closed. It could also be that the EGR piping is clogged up with soot (baked carbon deposits). Similarly the p0404 is an EGR related error code. Your vehicle is quite new and it would be unusual for the EGR to pack up or require cleaning out so early in its life. I would make sure that the connector pins in the connection socket to the EGR are clean and bright and that there no breaks in the wiring back to the power control module. If no joy then remove the EGR and examine the freedom of movement of the valve. If gummed up spray liberally with carburettor cleaner spray and leave to stand for at least ten minutes before wiping away the crud. Repeat until the valve looks like new and reinstall. After four or five restarts without fault the error code should clear.
1,920 views
Usually answered in minutes!
×