P0440Gmc CanyonYears: 1996 - 2026
Evaporative Emission Control System Malfunction
Reviewed by ASE Certified Technician
What does this mean?
Code P0440 indicates a general malfunction in the EVAP system, which prevents fuel vapors from escaping into the atmosphere. The PCM detected a problem during an EVAP system test.
Disclaimer: This diagnostic code is part of the standard OBD2 system and can apply to Gmc Canyon models manufactured from 1996 to 2026. However, please note that the presence of this specific code depends on your vehicle's exact engine configuration, options, and production year.
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Common Causes
Loose, damaged, or missing gas cap
Faulty EVAP purge control valve
Faulty EVAP vent valve/solenoid
Cracked or disconnected EVAP hose
Saturated or damaged EVAP charcoal canister
Symptoms to Watch For
- Check Engine Light is illuminated
- Strong fuel odor from vehicle
- Failed emissions test