P0442 on a 2019 Kia Sorento

P0442 means the EVAP system could not hold pressure or vacuum during a leak test, but the leak is small.

Not your vehicle? See general P0442 info.

Most common causes on the 2019 Kia Sorento

Ranked from 418 NHTSA owner complaints filed for this vehicle.

Sort by:

1
Low-pressure fuel pump seal leak (2018-2019 Kia fuel pump recall/warranty extension)
High severity
Kia issued a warranty-extension notice for a low-pressure fuel pump leak on 2018-2019 models, and this vehicle has multiple complaints of fuel smell, sprayed fuel, and confirmed leaking fuel pumps matching that exact defect.
Reported in 6 NHTSA complaints
Parts:fuel pump
2
Cracked EVAP line near the fuel tank
Medium severity
One owner was told directly by a mechanic that the leak was in the evaporative line above the fuel tank, a direct EVAP-system leak on this vehicle.
Reported in 1 NHTSA complaint
Parts:EVAP line
3
Loose or faulty gas cap
Low severity
The most common small-EVAP-leak cause generally; verify the cap seats and clicks properly.
Common cause
Parts:fuel cap
4
Purge valve failure
Medium severity
A purge valve that leaks or sticks disrupts the EVAP system's ability to hold vacuum/pressure during the small-leak monitor.
Common cause
Parts:purge valve
5
Canister vent valve failure
Medium severity
A vent valve that doesn't seal fully lets in a small amount of outside air, the classic P0442 pattern.
Common cause
Parts:vent valve
6
Charcoal canister crack
Medium severity
A cracked canister housing is a common small-leak source near the fuel tank.
Common cause
Parts:charcoal canister

Part links go to Amazon search results for this vehicle. As an Amazon Associate, WrenchConnect earns from qualifying purchases — always confirm fitment for your exact trim and engine before ordering.

These causes are aggregated from NHTSA owner complaints and general repair knowledge — this is not a diagnosis. P0442 on your car still needs shop confirmation before any repair.

Common symptoms

Check engine light
Fuel smell near vehicle
Usually drives normally
Hard start after fueling in some cases

What to check before replacing parts

Tighten and inspect the gas cap

Look for: A cap that doesn't click to full tightness, has a visibly cracked or flattened seal, or is simply missing is the single most common cause of a small EVAP leak — rule it out first.

Smoke-test the EVAP system

Look for: Because this is a small leak, expect only a thin wisp of smoke or a faint hiss at one spot (a hose, seam, or valve) rather than an obvious cloud — look closely and take your time.

Check purge valve sealing

Look for: A purge valve that doesn't hold vacuum when commanded closed lets a small amount of air bleed through, which the system reads as a leak during its self-test.

Inspect hoses near the tank and engine bay

Look for: Look for small cracks, soft/collapsed spots, or a hose that has pulled loose slightly at a fitting — any of these can leak just enough to trip a small-leak code without an obvious fuel smell.

Verify vent valve operation

Look for: A vent valve that doesn't seal fully when commanded closed prevents the system from holding vacuum during its self-test, which reads as a small leak even with no physical leak in the hoses.

Rather have a pro handle it? Find a vetted local mechanic.

Matching symptoms

Check Engine Light