P0442 on a 2017 Chevrolet Malibu Eco

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 Chevrolet Malibu Eco

Ranked from 687 NHTSA owner complaints filed for this vehicle.

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1
Failed EVAP canister vent solenoid
Low severity
An owner's scan tool pulled P0498/P0449 for the EVAP vent control circuit and the fix called for replacing the evaporative emissions canister vent solenoid -- the owner noted three other vehicles with the identical fault.
Reported in 1 NHTSA complaint
Parts:EVAP canister vent solenoid
2
Restricted/faulty fuel tank filler or vent path
Low severity
An owner reports the fuel tank will only fill to about 7/8 capacity, consistent with a restricted EVAP vent path that can also register as a small system leak.
Reported in 1 NHTSA complaint
Parts:fuel tank vent valve
3
Loose or worn gas cap seal
Low severity
An ill-fitting or degraded gas cap is the most common, easiest-to-rule-out source of a small EVAP leak.
Common cause
Parts:fuel cap
4
Cracked or brittle EVAP hose/line
Low severity
Rubber and plastic EVAP lines harden with age/heat and develop pinhole leaks that trip the small-leak monitor.
Common cause
Parts:EVAP hose
5
Failed purge valve
Low severity
A purge solenoid that leaks internally prevents the EVAP system from holding the small target vacuum used for leak detection.
Common cause
Parts:purge valve
6
Cracked charcoal canister
Low severity
A hairline crack in the canister housing is a common small-leak source that only surfaces during the EVAP monitor's 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.

Rather have a pro handle it? Find a vetted local mechanic.

Matching symptoms

Check Engine Light