P0446Gmc Hummer-evYears: 1996 - 2026
Evaporative Emission Control System Vent Control Circuit Malfunction
Reviewed by ASE Certified Technician
What does this mean?
Code P0446 indicates a malfunction in the EVAP vent control circuit.
Disclaimer: This diagnostic code is part of the standard OBD2 system and can apply to Gmc Hummer-ev 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
Faulty EVAP vent valve/solenoid
Damaged, chafed, or broken wiring harness
Corroded or loose electrical connector
Saturated or damaged EVAP charcoal canister
Symptoms to Watch For
- Check Engine Light is illuminated
- Strong fuel odor from vehicle
- Failed emissions test