Cadillac Escalade EVAP failure P0449 code resolved by replacing solenoid and purge valve with harness relocation on Cadillac Escalade

Some Cadillac Escalade owners report experiencing issues related to the P0449 code, which indicates a malfunction within the Evaporative Emission Control System, specifically involving the vent valve or solenoid. These issues may arise from a faulty vent valve, damaged wiring, or a clogged charcoal canister, leading to symptoms such as a Check Engine Light, fuel smell, and failed emissions tests. Owners have noted that the vent solenoid, located under the vehicle near the rear and mounted to the side of the EVAP canister, may require replacement or repair. Additionally, problems can stem from an open or short in the optical sensor circuit, a damaged optical sensor, or a malfunctioning PCM or ECM. It is recommended that owners perform a diagnostic scan to confirm the P0449 code, inspect the wiring for damage, and replace any faulty components to resolve the issue effectively.