On a 2001 GMC Sonoma, the evaporative emission control system vent control circuit is typically located near the fuel tank. It is connected to the EVAP canister and may involve a vent solenoid that regulates the flow of vapors. You'll often find the wiring harness and connectors leading to this component near the rear of the vehicle, under the bed or near the fuel filler neck. For precise location, consulting a repair manual or service guide specific to your vehicle is recommended.
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