P0442 on a 2016 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 2016 Ford Edge

Ranked from 883 NHTSA owner complaints filed for this vehicle.

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1
Purge valve/solenoid stuck open or leaking
Medium severity
Multiple owners report repeatedly replacing the canister purge valve/solenoid, with the fault returning within weeks; a leaking valve pulls in unmetered air and fails the small-leak EVAP test.
Reported in 4 NHTSA complaints
Parts:purge valve
2
Cracked or leaking EVAP/fuel line, or a fuel-line failure allowing vapor/air exchange
Medium severity
A fuel-odor complaint traced to a hole in the fuel line (repaired but odor returned) and a separate fuel-line-connection leak both indicate the fuel/vapor plumbing on this platform is prone to small leaks.
Reported in 2 NHTSA complaints
Parts:fuel line evap hose
3
Loose, damaged, or missing gas cap
Low severity
One owner explicitly notes not having a gas cap while chasing a purge-related code; a poorly seated or missing cap is the single most common source of a small EVAP leak.
Reported in 1 NHTSA complaint
Parts:gas cap
4
Corroded or rust-damaged fuel tank/filler neck area
Medium severity
A referenced NHTSA campaign for a corroded gas tank on this model suggests tank/filler-neck corrosion is a known failure point that can create small vapor leaks.
Reported in 1 NHTSA complaint
Parts:fuel tank
5
Cracked charcoal (EVAP) canister
Medium severity
A porous or physically cracked canister housing allows a small, steady vapor leak that will not seal even with a good cap.
Common cause
Parts:charcoal canister
6
Vent valve stuck open
Low severity
A stuck-open vent valve prevents the EVAP system from sealing for the leak-detection test, registering as a small leak.
Common cause
Parts:vent valve

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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.

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Matching symptoms

Check Engine Light