P0442 on a 2010 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 2010 Ford Edge

Ranked from 672 NHTSA owner complaints filed for this vehicle.

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1
Corroded or leaking fuel tank / filler neck (subject of NHTSA recall 15V712000)
High severity
By far the dominant pattern in this vehicle's complaints: repeated reports of gas odor, fuel stains under the car, and a confirmed leaking/corroded tank, tied to Ford's own fuel-tank recall for this model.
Reported in 13 NHTSA complaints
Parts:fuel tank fuel filler neck
2
Fuel pump seal/connector failure allowing vapor past the tank assembly
Medium severity
One owner's fuel pump was found failing intermittently and overheating badly enough to melt its electrical connector, which can also compromise the tank's vapor seal at the pump module.
Reported in 1 NHTSA complaint
Parts:fuel pump
3
Loose or worn gas cap seal
Low severity
Always the first check for an EVAP leak code; a cap that won't seat fully lets vapor escape.
Common cause
Parts:gas cap
4
EVAP purge valve stuck open
Low severity
Lets fresh air into the system during the leak-check monitor, tripping a small-leak code.
Common cause
Parts:purge valve
5
EVAP vent valve stuck open
Low severity
Prevents the system from sealing for the leak test, setting a leak code.
Common cause
Parts:vent valve
6
Cracked EVAP hose/line
Low severity
Age and heat-cycling crack the plastic EVAP lines routed near the tank and engine bay.
Common cause
Parts:EVAP hose
7
Charcoal canister crack
Low severity
A cracked canister housing leaks vapor past the monitor's small-leak threshold.
Common cause
Parts:EVAP canister

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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