P0442 on a 2018 Ford Edge

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 2018 Ford Edge

Ranked from 779 NHTSA owner complaints filed for this vehicle.

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1
Failing EVAP canister purge valve
Medium severity
One complaint explicitly reports the fuel purge valve going bad, causing hard/failed restarts after refueling; another logged a dealer/AutoZone-confirmed P0456 EVAP fault that recurred after a prior repair.
Reported in 2 NHTSA complaints
Parts:purge valve
2
Damaged, loose, or non-sealing gas cap / filler-neck seal
Low severity
One owner describes the tank effectively lacking a functioning cap, unable to build the vapor pressure needed to draw fuel — a direct gas-cap/filler-neck seal failure mode that also sets small-leak EVAP codes.
Reported in 1 NHTSA complaint
Parts:gas cap filler neck seal
3
EVAP vent line or fuel-tank pressure sensor fault triggering stalls at the pump
Medium severity
A complaint describes RPM surging and stalling specifically during refueling with a fuel smell at the tank — consistent with a cracked EVAP vapor line or a faulty fuel-tank pressure sensor rather than the purge valve itself.
Reported in 1 NHTSA complaint
Parts:EVAP vent valve fuel tank pressure sensor
4
Physically damaged fuel tank or EVAP line (road debris)
Medium severity
One owner found a hole in the fuel tank after a highway impact, with fuel draining out and a persistent gas smell — physical damage to the tank or its EVAP lines is worth ruling out on inspection.
Reported in 1 NHTSA complaint
Parts:fuel tank EVAP line
5
Charcoal canister crack or saturation
Medium severity
A cracked or fuel-saturated canister can no longer hold vapor pressure, tripping a small-leak code during the EVAP monitor's test.
Common cause
Parts:charcoal canister
6
EVAP vent valve stuck partially open
Medium severity
A vent valve that doesn't fully seat during the leak test lets the system bleed down, mimicking a small leak.
Common cause
Parts:vent valve
7
Rusted or corroded filler neck
Low severity
Corrosion can pit the filler neck enough to leak vapor slowly, especially on vehicles that see road salt.
Common cause
Parts: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