Service VME - 6.0 LQ4 Check Engine Light and DTC P0446 -cap emissions filter fuel gas plug solenoid valve vent

When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.

Should you encounter DTC P0446 in the course of diagnosing the reason for a Check Engine Light, one possible cause could be that the evaporative emission canister vent solenoid valve outlet is plugged, particularly if the customer has been off-roading. Clean the valve outlet and perform the diagnostics as outlined in Service Information.

Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar symptoms.