P0442 on a 2019 Chevrolet Silverado Ld 1500

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 Silverado Ld 1500

Ranked from 822 NHTSA owner complaints filed for this vehicle.

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1
EVAP vent valve stuck closed (P0499)
High severity
An owner reports a recurring P0499 'EVAP vent valve stuck closed' code alongside the CEL, directly implicating the vent valve.
Reported in 1 NHTSA complaint
Parts:EVAP vent valve
2
Purge valve/pump failure
High severity
An owner's EVAP purge pump/valve failed three times, a direct and recurring hardware cause of small-leak codes.
Reported in 1 NHTSA complaint
Parts:EVAP purge valve
3
Damaged or broken fuel filler cap/cap spring
High severity
An owner found the spring-loaded fuel cap mechanism broken and fallen into the filler area, preventing a proper seal.
Reported in 1 NHTSA complaint
Parts:fuel filler cap
4
Fuel pump control module fault disrupting EVAP vent/purge operation
Medium severity
An owner's EVAP circuit code was traced by the dealer to the fuel pump control module, which on this platform also affects the EVAP system's ability to vent properly.
Reported in 1 NHTSA complaint
Parts:fuel pump control module
5
Fuel tank or filler neck leak
Low severity
One owner experienced a ruptured fuel tank, an extreme case showing this fuel system component can compromise the EVAP seal.
Reported in 1 NHTSA complaint
Parts:fuel tank fuel filler neck
6
Cracked or disconnected EVAP hose/line
Low severity
A pinhole crack or loose connection in the EVAP hose routing lets vapor escape below the large-leak threshold.
Common cause
Parts:EVAP hose
7
Charcoal canister crack
Low severity
A cracked canister housing is a common small-leak source found during smoke testing.
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