P0440: Evaporative Emission Control System Malfunction
17 vehicles · 9 makes · $20-$2,500 repair
P0440 is an OBD-II diagnostic trouble code meaning “Evaporative Emission Control System Malfunction.” General EVAP system malfunction. The system that captures fuel vapors and routes them back to the engine is not working correctly. This code appears across 17 vehicle models from 9 manufacturers, with repair costs ranging from $20 to $2,500.
Common Causes
Typical Repair Cost
Based on 19 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0440, 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 (17)
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 P0440 mean?
P0440 stands for "Evaporative Emission Control System Malfunction." General EVAP system malfunction. The system that captures fuel vapors and routes them back to the engine is not working correctly.
What are the most common causes of P0440?
The most common causes of P0440 are: Loose or damaged gas cap, EVAP canister crack or leak, Faulty purge valve, Damaged EVAP hose, Faulty vent valve. The specific cause varies by vehicle.
How much does it cost to fix P0440?
Repair costs for P0440 range from $20 to $2,500, depending on the vehicle and root cause.
Which vehicles are affected by P0440?
Au7o has documented P0440 across 17 vehicle models from 9 manufacturers: Chevrolet, Chrysler, Dodge, Hyundai, 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.