2003 chevrolet suburban P0443 evap emission control system purge valve C fault where is the valve?"
The Evap Vent Solenoid is located near/on the Evap Canister under the car near the fuel tank. Start with inspecting the evap lines for any pulled, loose, cut or broken hoses.
The Evap Purge Solenoid is located in the engine compartment. Which might be bad if there is no loose, cut or broken hoses
here is a youtube video I found that should help you, at least so you know where the evap canister is
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