P0442 on a 2016 Jeep Cherokee

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 2016 Jeep Cherokee

Ranked from 1,400 NHTSA owner complaints filed for this vehicle.

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1
Persistent fuel odor consistent with an EVAP line leak
Medium severity
Two owners reported a recurring strong gasoline smell in or near the cabin, a classic symptom of a leaking EVAP hose or seal.
Reported in 2 NHTSA complaints
Parts:EVAP hose
2
Stuck or failing EVAP purge valve
Medium severity
A fuel pump failure on one vehicle caused the emissions purge tank to fill with liquid fuel, pointing to a purge-path fault that can also manifest as a small leak code.
Reported in 1 NHTSA complaint
Parts:purge valve charcoal canister
3
Prior EVAP small-leak code (P0441) on the same vehicle
Medium severity
One owner's engine light had already logged a P0441 possible-EVAP-leak code from the powertrain, suggesting an ongoing purge/vent system fault.
Reported in 1 NHTSA complaint
Parts:purge valve
4
Loose, worn, or improperly seated gas cap
Low severity
The single most common cause of a small EVAP leak code; check for a cracked seal or cap that won't fully click.
Common cause
Parts:gas cap
5
Cracked or brittle EVAP hoses/lines
Medium severity
Rubber EVAP lines dry out and crack with age/heat cycling, producing a small vacuum leak the PCM detects during its leak-check monitor.
Common cause
Parts:EVAP hose
6
Charcoal canister cracks or saturation
Low severity
A cracked or oil/fuel-saturated canister can't hold vacuum properly during the EVAP self-test.
Common cause
Parts:charcoal canister
7
Rusted or damaged filler neck
Low severity
Corrosion around the fuel filler neck creates a small unmetered leak path in the EVAP system.
Common cause

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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