Resolving Hyundai EVAP Issue

Certain 2012-2016 Hyundai Veloster vehicles equipped with a 1.6L GDI engine may experience a check engine light.
Sept. 25, 2023
Mitchell 1
Example of the previous air drain case 31035-2K500.
Example of the previous air drain case 31035-2K500.

Certain 2012-2016 Hyundai Veloster vehicles equipped with a 1.6L GDI engine may experience a check engine light with the following DTCs:

- P0455 (evaporative emission system large leak) 

- P0456 (EVAP very small leak)

- P0449 (canister closed valve...CCV...restricted vent circuit)

- P0451 (fuel tank PSI sensor range performance)

There may be no drivability symptoms associated with these DTCs. Replace the Air Drain case (also referred to as canister vent filter). The previous air drain case is P/N 31035-2K500. The new and modified P/N is 31035-B2500FFF.

Remove the fuel filler neck assembly. Remove the retaining clip from the air drain case using a flathead screwdriver. Pull the hose to remove the air drain case from the filler neck. Release the clamp using pliers and remove the air drain case.
Install the new/improved air drain case. Reinstall all parts in reverse order. Connect the GDS and perform the Evap Leakage Test to ensure a result of No Leak Detected. This will confirm proper installation and that the original P0455 condition has been resolved. 

About the Author

Information courtesy of Mitchell 1

Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.

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