P0442: How to Diagnose & Fix — Evaporative Emission Control System Leak Detected (Small Leak)
37 vehicles · 18 makes · $20-$1,800 repair
How to diagnose and fix P0442: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Chrysler 300 · 2011–2023
Evaporative emission control system develops small leaks triggering P0456 code. Most commonly failed gas cap, chaffed EVAP purge pipe harness, or failed purge solenoid. Triggers check engine light and prevents emissions testing pass.
Common Symptoms
- Check engine light with P0456 code
- "Gas cap" warning even with cap tight
- Fuel smell near vehicle
- Failed emissions test
- No performance or drivability issues
How to Fix
Start with gas cap replacement ($20-40). If code returns, smoke test EVAP system to locate leak. Common fixes: replace purge solenoid, repair chaffed wiring harness, or replace cracked EVAP hoses.
Sources for this issue (1)
Dodge Journey · 2009–2020
AC compressor fails due to inadequate lubrication, leaky seals, and internal mechanical failure. Evaporator develops leaks from age and moisture. Condenser prone to damage from road debris. Lack of lubrication from leaks causes compressor seizure.
Common Symptoms
- AC blows warm air
- AC works intermittently
- Compressor clutch not engaging
- Loud grinding or squealing from compressor
- Musty odor from vents (evaporator mold)
How to Fix
Diagnose AC system to identify leak source. Replace failed compressor ($400-800), evaporator ($300-600), or condenser ($200-400) as needed. Flush AC system when replacing compressor. Replace receiver/drier whenever system opened.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Mopar 55111410AF complete A/C compressor
Replace a compressor confirmed failed on the listed configuration Fitment: 2016-2020 Journey 2.4L on the product fitment table; not the 3.6L compressor Live OEM direct-product page when checked
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (1)
Ford Transit Connect · 2014–2021
Owners report extended cranking, rough idle, or stalling shortly after refueling due to an EVAP canister purge valve that sticks open and floods the intake with fuel vapor. This failure mode is documented across Ford applications and appears in Transit Connect owner reports and service literature addressing purge valve performance. The condition often triggers EVAP-related DTCs and can worsen over time.
Common Symptoms
- Hard start immediately after refueling
- Rough idle or stumble after fill-up
- Occasional stall when coming to a stop
- Fuel odor near engine bay
- Check engine light on
How to Fix
Replace the EVAP canister purge valve/solenoid and inspect EVAP lines for liquid fuel contamination. Clear codes and verify proper purge operation with scan tool commands; advise against topping off the tank to reduce recurrence risk.
Sources for this issue (1)
Chevrolet HHR · 2006–2011
Toyota Corolla · 2000–2008
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P0442 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0442 mean?
P0442 stands for "Evaporative Emission Control System Leak Detected (Small Leak)." This emissions code means the evaporative emission (EVAP) control system has detected a small leak. The EVAP system seals the fuel tank and captures gasoline vapors, routing them to be burned in the engine instead of escaping into the air, and the computer periodically pressure- or vacuum-tests the system to confirm it's sealed. A small leak the size of about a 0.040-inch hole will set this code. By far the most common and cheapest cause is a loose, damaged, or missing gas cap, so that's the first thing to check, though any cracked hose or worn seal in the system can also trigger it.
What are the most common causes of P0442?
The most common causes of P0442 are: Loose, damaged, or missing fuel filler cap, Worn or cracked gas cap seal, Cracked or disconnected EVAP hose or line, Faulty purge valve or vent valve, Damaged O-ring or seal at the fuel tank or filler neck, Small crack in the charcoal canister, Leaking fuel tank sending unit gasket. The specific cause varies by vehicle.
How much does it cost to fix P0442?
Repair costs for P0442 range from $20 to $1,800, depending on the vehicle and root cause.
Which vehicles are affected by P0442?
Au7o has documented P0442 across 37 vehicle models from 18 manufacturers: Chevrolet, Chrysler, Dodge, Ford, GMC, Honda, Hyundai, Infiniti, Jeep, Kia, Mazda, Nissan, Pontiac, RAM, Saturn, Subaru, Toyota, Volkswagen.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.