Generic
Type:
    Powertrain - Auxiliary Emission Controls - ISO/SAE Controlled
Description:
    Evaporative Emission System Vent Valve/Solenoid Circuit

GM
Type:
    Powertrain - Auxiliary Emission Controls - ISO/SAE Controlled
Description:
    EVAP Vent Solenoid Control Circuit Conditions
Cause:
    Engine speed over 600 rpm, system voltage from 6-18v, then the PCM detected that the Actual and Commanded state of the Vent Control solenoid control circuit did not match for over 5 seconds.