Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSKIA2015CADENZA LIMITEDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM DIAGNOSIS (2 OF 3)DTC P0456: EVAPORATIVE EMISSION SYSTEM-LEAK DETECTED (VERY SMALL LEAK)COMPONENT INSPECTION

2015 Kia Cadenza Limited

Component Inspection

2015 Kia Cadenza LimitedSECTION Component Inspection

Fuel Tank Inspection
1. Visual Inspection
  1. Check the hose connecting fuel tank and filler neck for cracks or fuel leakage.
    And then, check tightening of the clamp band.
  2. Check for cracks or fuel leakage on the filler neck.
  3. Check fuel tank for fuel leakage or any marks of impacts from the outside.
  4. Check tightening of the hose band on evaporative gas line and O-ring status in the coupler.
  5. Has a problem been found?
    YES
    - Repair or replace as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
    NO
    - Go to "SEAL INSPECTION ON THE FUEL PUMP & VENT VALVE " as below.
SEAL INSPECTION ON THE FUEL PUMP & VENT VALVE
1. Visual Inspection
  1. Check that the fuel pump is tight and properly installed. Check that Vent Valve flange is secure.
  2. Check that the seal, installed on fuel pump and vent valve, is not missing, deformed or torn out.
  3. Check that the flange contacting seal with fuel pump and vent valve, is not deformed or torn out.
  4. Has a problem been found?
    YES
    - Repair or replace as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
    NO
    - Go to "VENT VALVE INSPECTION " as below
VENT VALVE INSPECTION
1. Place the vent valve to the direction for installation, check that air can pass through the vent valve by blowing air into the port by mouth.
2. Place the vent valve is upside down, check that amount of air is reduced or there is some feeling of resistance if blowing air into the port by mouth.
  NOTE: Never inhale the air from the Vent Valve during the Vent Valve inspection.
3. Has a problem been found?
  YES
  - Repair or replace as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Go to "FUEL TANK CAP INSPECTION " as below
FUEL TANK CAP INSPECTION
1. Check that a different kind of fuel tank cap is not installed
2. Check the contact surface between filler neck and fuel tank cap is OK
  - Fuel Filler Neck: Check the surface of Filler Neck where Fuel tank cap seal contacts.
  - Fuel tank cap: (1) Check that seal on the cap is undamaged.
    (2) Check operation of the pressure valve and vacuum valve in the fuel cap.
3. Has a problem been found?
  YES
  - Repair or replace as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Go to "VERIFICATION OF VEHICLE REPAIR " procedure.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.