Home >> Buick >> 2014 >> Verano Base >> Repair and Diagnosis (Single Page) >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC System - Manual >> Diagnostic Information and Procedures >> DTC B0223, B0233, B023A or B0408: Recirculate Position Command/Air Flow Control Circuit/HVAC Actuators/Main Temperature Control Circuit >> Diagnostic Instructions