P0442: Evaporative Emission Control System Leak Detected (Small Leak)
21 vehicles · 11 makes · $20-$2,500 repair
P0442 is an OBD-II diagnostic trouble code meaning “Evaporative Emission Control System Leak Detected (Small Leak).” A small leak has been detected in the EVAP system. Often as small as a pinhole or loose gas cap. This code appears across 21 vehicle models from 11 manufacturers, with repair costs ranging from $20 to $2,500.
Common Causes
Typical Repair Cost
Based on 23 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0442, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Vehicles Affected (21)
Fuel Line Corrosion and Leak Near Rear Wheel
EVAP Vent Solenoid Clogging With Dust/Water Causing Check Engine Light and Hard Refueling
Rear AC System Failure and Refrigerant Leaks
Rear A/C System Failure
Fuel Filler Neck Corrosion and Rust-Through Triggering EVAP Leaks and Fuel Smell
EVAP Canister and Vent Control Valve Failure Triggering Check Engine Light
EVAP Vent Control Valve / Charcoal Canister Faults Triggering Check Engine Light and Hard Refueling
A/C Compressor and Evaporator Failure
A/C Musty/Mold Smell
EVAP Charcoal Canister / Vent Valve Failure Triggering Check Engine Light
Evaporative Emissions Leak Faults from Charcoal Canister, Vent Valve, or Filler Neck Corrosion
EVAP Charcoal Canister and Vent Valve Failure Causing Check Engine Light
EVAP Charcoal Canister / Vent Valve Failure Triggering Check Engine Light and Refueling Vapor Issues
FAQ
What does P0442 mean?
P0442 stands for "Evaporative Emission Control System Leak Detected (Small Leak)." A small leak has been detected in the EVAP system. Often as small as a pinhole or loose gas cap.
What are the most common causes of P0442?
The most common causes of P0442 are: Loose or worn gas cap, Small crack in EVAP hose, Faulty purge or vent valve, EVAP canister leak, Filler neck corrosion. The specific cause varies by vehicle.
How much does it cost to fix P0442?
Repair costs for P0442 range from $20 to $2,500, depending on the vehicle and root cause.
Which vehicles are affected by P0442?
Au7o has documented P0442 across 21 vehicle models from 11 manufacturers: Chevrolet, Chrysler, Dodge, Ford, Hyundai, Infiniti, Kia, Mazda, Nissan, Subaru, Toyota.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.