📖 What Does P0440 Mean?
Symptoms
- • Check engine light
- • occasional fuel odor
- • failed emissions test
- • fuel smell after refueling.
Common Causes
- • Loose gas cap
- • damaged EVAP hoses
- • faulty purge valve
- • vent valve problems
- • charcoal canister issues.
Possible Solutions
Tighten gas cap, inspect and replace damaged EVAP components, test purge and vent valves, replace charcoal canister.
Fixing this on your car?
Get a vehicle-specific repair guide with exact parts, oil specs, and torque settings for your make and model.
🚙 Get Vehicle-Specific Fix Guide
Select your vehicle to see a customized repair guide with exact parts and specifications:
❓ Common Questions About P0440
Can I drive with code P0440?
Yes, code P0440 is generally a minor issue. It is safe to drive, but you should schedule a repair at your earliest convenience.
How much does it cost to fix P0440?
The estimated repair cost for code P0440 is between $20 and $200. This includes parts and labor for most makes and models.
Is this code easy to fix myself?
Yes, this is often a DIY-friendly repair. With basic tools and the correct part, many owners can resolve this themselves in under an hour.
Required Parts
Recommended Tools
Need a Pro?
Complex codes like P0440 can be tricky. Don't risk it if you're unsure.
Recommended Tool
Professional OBD2 Scanner
Read & clear codes, view live data, and reset service lights yourself.
View Best Sellers ↗Related Diagnostic Codes
Other codes that may appear with P0440
P0441: Evaporative Emission Control System Malfunction
EVAP System Leak Detected Small Leak
Evaporative Emission Control System Purge Control Valve Circuit Malfunction
Evaporative Emission Control System Vent Control Circuit Malfunction
EVAP System Leak Detected Large Leak
💡 Why These Codes Are Related:
- • Similar Issues: Same root cause or component failure
- • Related Problems: Often occur together due to system interactions
- • Sequential Codes: Progressive failure stages or multiple sensors
- • Same System: Components within the same automotive system