Having problems with your 2008 Saturn VUE ?

My check engine light is on and I am getting codes P0449 and P0455. What is this and how do i fix it?

Posted / edited by AnonymousUser on : 18-06-2018

Answers :

The p0455 is for a leak concern and if that was the only code I'd say give the cap a shot. However the p0455 is most likely just a side effect of the P0449. The P0449 is a test that is run on the vent solenoid circuit to check the electrical functions in basic terms. The computer is putting out voltage amount X and in a properly functioning circuit it knows it will see voltage amount Y come back. It isn't coming back as what it expects to come back at so there must be something electrically wrong with the vent circuit. And of course if the vent doesn't work you get a large leak. If we are just throwing parts at trucks the logical one for you is a vent valve. Since your Vue is a 2008, most likely there is a good chance that it's covered under the emission warranty which is 5 years. \015\012
\015\012Thank you for using fixya. and be safe.
P0449 - Evaporative Emission Control System Vent Valve/Solenoid \015\012Circuit Malfunction

The repair \015\012suggested is to replace the canister vent solenoid and relocate it to a \015\012position near the fuel filler neck. This may help but there is know way \015\012to tell for sure if this will correct your particular issue.

P0455 - Evaporative Emission Control System Leak Detected (no purge flow or large leak)

What does that mean?
This indicates a fuel vapor leak or lack of purge flow in the EVAP control system. It means a large leak has been detected. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

You likely won't notice any drivability problems.

A code p0455 most likely means one or more of the following has happened:
* A loose or improperly affixed gas cap
* A non-conforming gas cap (i.e. not factory/original brand)
* Other leak or damaged piece in EVAP system

Possible Solutions:
With a p0455, the most common repair is to:
* Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
* Otherwise, replace the gas cap, and/or
* Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary

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Repair Help & Product Troubleshooting for 2008 Saturn VUE

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