Possible causes

– EVAP Canister Purge Solenoid harness is open or shorted
– EVAP Canister Purge Solenoid circuit poor electrical connection
– Faulty EVAP Canister Purge Solenoid

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P1676 GMC Description

The Engine Control Module (ECM) has detected an improper voltage level on the output driver module for the EVAP canister purge solenoid control circuit