P0442 on a 2019 Honda Accord Hybrid

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 Honda Accord Hybrid

Ranked from 529 NHTSA owner complaints filed for this vehicle.

Sort by:

1
EVAP canister vent valve/solenoid fault
Medium severity
One owner's dash threw a generic 'EVAP system failing' warning with no other clear cause; a vent valve that doesn't seal is a common source of this kind of message.
Reported in 1 NHTSA complaint
Parts:vent valve
2
Fuel filler door lock actuator fault preventing a proper door/cap seal
Low severity
One owner reported the fuel-door lock motor grinding and not operating correctly, which can keep the filler door from closing and sealing fully.
Reported in 1 NHTSA complaint
Parts:fuel filler door lock actuator
3
Loose, damaged, or poorly-sealing gas cap
Low severity
The single most common source of a small EVAP leak; check for a cracked seal or a cap that doesn't click closed.
Common cause
Parts:gas cap
4
EVAP purge valve leaking or stuck
Medium severity
A purge valve that won't seal lets engine vacuum bleed into the charcoal canister line even with the engine off, registering as a small leak.
Common cause
Parts:purge valve
5
Cracked or deteriorated EVAP hose/line
Medium severity
Rubber EVAP lines harden and crack with age, most often near the canister or under the vehicle where they're exposed to road heat and debris.
Common cause
6
Charcoal canister crack or damage
Medium severity
A cracked canister housing leaks vapor before it reaches the purge valve and is a common small-leak source on higher-mileage vehicles.
Common cause
Parts:EVAP canister
7
Rusted or corroded fuel filler neck
Low severity
Corrosion perforates the filler neck over time, especially in road-salt regions, creating a small vapor leak.
Common cause

Part links go to Amazon search results for this vehicle. As an Amazon Associate, WrenchConnect earns from qualifying purchases — always confirm fitment for your exact trim and engine before ordering.

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