📖 What Does P0440 Mean?
General malfunction detected in the EVAP system that prevents fuel vapors from escaping to atmosphere.
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.
Recommended Parts & Tools
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📦 Parts Needed
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Frequently Asked Questions about P0440
How serious is P0440?
This code has a low severity level. While not immediately dangerous, this should be addressed during your next service.
Can I drive with P0440?
Generally safe to drive, but should be addressed during your next service.
How much does it cost to fix P0440?
Repair costs vary depending on the root cause, but typically range from $50-150 including parts and labor.
Related Diagnostic Codes
Other codes that may appear with P0440
Emission Control System Code P0441
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