C 2500 Yukon XL 2WD V8-6.0L VIN U (2001)
Canister Purge Solenoid: Description and Operation
The EVAP vent valve controls the fresh airflow into the EVAP canister. The EVAP vent valve is normally open. The PCM will command the valve
closed during some EVAP tests, allowing the system to be tested for leaks.
