P0442 on a 2017 Hyundai Santa Fe Sport

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 2017 Hyundai Santa Fe Sport

Ranked from 340 NHTSA owner complaints filed for this vehicle.

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1
Charcoal canister damaged by road debris
High severity
One owner reports a rock strike to the underbody cracked the charcoal canister, noting there is no protective skid plate over it on this platform; a cracked canister is a direct small-leak source.
Reported in 1 NHTSA complaint
Parts:charcoal canister
2
EVAP line/fitting leak near the fuel tank/pump module
Medium severity
One owner reported a persistent strong fuel odor after fuel-tank/pump-module recall service, consistent with a disturbed EVAP line or seal not reseated correctly.
Reported in 1 NHTSA complaint
Parts:EVAP line fuel tank seal
3
Loose or worn fuel filler cap
Low severity
Always the fastest thing to rule out on any EVAP code; confirm it clicks fully and the seal isn't cracked or dry-rotted.
Common cause
Parts:fuel filler cap
4
Cracked or brittle EVAP hose
Medium severity
Under-hood heat cycling makes rubber EVAP hoses crack over time; smoke-test to locate.
Common cause
Parts:EVAP hose
5
Purge valve stuck open or leaking
Medium severity
Lets vacuum leak into the system at idle; verify with a scan-tool commanded purge test.
Common cause
Parts:purge valve
6
Vent valve (canister vent solenoid) failure
Medium severity
A valve that won't seal prevents the system from holding vacuum for the self-test.
Common cause
Parts:vent valve canister vent solenoid
7
Rusted fuel filler neck
Low severity
Corrosion can perforate the neck and cause a small vapor leak, more common in road-salt regions.
Common cause
Parts:fuel filler neck

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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