P0442 on a 2019 Chevrolet Traverse

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 Traverse

Ranked from 399 NHTSA owner complaints filed for this vehicle.

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1
Failed/leaking EVAP purge valve (canister purge solenoid)
Medium severity
Owners repeatedly report the purge valve failing and being replaced 2-3 times on the same vehicle, sometimes with a documented P0496 high-purge-flow code, directly matching a small EVAP leak/flow fault.
Reported in 7 NHTSA complaints
Parts:purge valve purge valve solenoid
2
Cracked or leaking EVAP fuel vapor canister
Medium severity
A smoke test on one of these vehicles traced a large EVAP leak specifically to the fuel vapor canister, which was replaced in addition to the purge valve.
Reported in 1 NHTSA complaint
Parts:EVAP canister
3
Loose, worn, or improperly seated gas cap
Low severity
The single most common trigger for any small EVAP leak code; always check/reseat or replace the cap before deeper diagnosis.
Common cause
Parts:gas cap
4
Cracked or disconnected EVAP hose/line
Medium severity
Age-hardened rubber lines or a line knocked loose during other underbody repairs create a small vacuum leak the EVAP monitor detects as a fault.
Common cause
Parts:EVAP hose
5
EVAP canister vent valve (vent solenoid) stuck open
Medium severity
A vent valve that won't seal lets the system bleed to atmosphere during the leak-check monitor, registering as a leak.
Common cause
Parts:vent valve solenoid
6
Rusted or corroded fuel filler neck
Low severity
Corrosion perforates the filler neck over time, especially in road-salt climates, creating a small but persistent EVAP leak path.
Common cause
Parts:fuel 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.

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Matching symptoms

Check Engine Light