P0442 on a 2019 Chevrolet Equinox

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 Chevrolet Equinox

Ranked from 292 NHTSA owner complaints filed for this vehicle.

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1
Leaking or corroded fuel tank / filler neck
High severity
Several owners report fuel visibly dripping from the top or rear of the tank area, including cases tied to a prior recall on this platform; a tank-area leak is a direct vapor-leak path for the EVAP system.
Reported in 3 NHTSA complaints
Parts:fuel tank fuel filler neck
2
Faulty EVAP purge/vent valve or canister assembly
High severity
One owner had the EVAP canister replaced for this exact code, only for the light to return, indicating the purge/vent hardware (not just the canister) is the actual fault on this vehicle.
Reported in 1 NHTSA complaint
Parts:EVAP canister purge valve vent valve
3
Loose, missing, or worn gas cap
Low severity
The single most common trigger for a small EVAP leak code; check that the cap clicks fully and its seal isn't cracked.
Common cause
Parts:fuel filler cap
4
Cracked or deteriorated EVAP hoses/lines
Medium severity
Rubber vapor lines running along the underbody harden and crack with age/heat, producing a small vapor leak; smoke-test the EVAP system to find it.
Common cause
Parts:EVAP hose
5
Stuck or leaking purge valve
Medium severity
A purge solenoid that doesn't seal lets air leak into the system when it should be closed, registering as a small leak on the EVAP monitor.
Common cause
Parts:purge valve
6
Cracked or saturated charcoal canister
Medium severity
A physically cracked canister housing or one soaked with liquid fuel can't seal properly during the leak test.
Common cause
Parts:charcoal 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.

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Matching symptoms

Check Engine Light