An improper voltage signal is sent to Powertrain Control Module (PCM) through the valve.
Engine Light ON (or Service Engine Soon Warning Light)
P0443 Chevrolet Description
The Evaporative Emission System (EVAP) canister purge volume control solenoid valve uses a ON/OFF duty to control the flow rate of fuel vapor from the EVAP canister. The EVAP canister purge volume control solenoid valve is moved by ON/OFF pulses from the Powertrain Control Module (PCM). The longer the ON pulse, the greater the amount of fuel vapor that will flow through the valve.