Hyundai Sonata GLS 2.4L, L4, MFI, DOHC, (EVAP) vent valve code P0449.

VEHICLE:  2010 Hyundai Sonata GLS 2.4L, L4, MFI, DOHC, VIN C, Eng Version N/R

MILEAGE:  89,000

Customer Concern: Malfunction Indicator Light (MIL) is on. Evaporative Emission (EVAP) vent valve code P0449.

Tests:
1. Check the air filter for the Canister Closing Valve (CCV) to determine if the filter is plugged/restricted.
2. Check the CCV valve hoses for being kinked or restricted.
3. Check the CCV for being stuck closed. When the CCV is powered up and grounded (energized), it should be closed, but when de-energized it should be open and be able to be easily blown through by mouth.

Potential Causes:

Canister Closing Valve (CCV)

Canister Closing Valve (CCV) Vent Hose

Canister Closing Valve (CCV) Air Filter

Confirmed Fix:

Replaced Canister Closing Valve (CCV): Replaced the CCV too.

Replaced Canister Closing Valve (CCV) Air Filter: The CCV air filter was plugged.

Hyundai Sonata GLS 2.4L, L4, Malfunction Indicator Light (MIL) is on. Evaporative Emission (EVAP) vent valve code P0449.