Home >> Buick >> 2017 >> Envision Base >> Repair and Diagnosis (Single Page) >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC System - Automatic >> Diagnostic Information and Procedures >> DTC B0223, B022A, B0233, B023A, B0408, B0418, B0428, or B3531: Recirculate Position Command/Air Flow Control/Air Flow Control/Temperature Control/Rear Air Flow Control >> Diagnostic Instructions