Powertrain, generic · Vehicle speed, idle control and auxiliary inputs

P05B7 Active Grille Air Shutter B Supply Voltage Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

Shutter B is the second active grille shutter – at GM, Ford and Stellantis the lower one in the bumper. Shutters cut drag and speed warm-up when closed and open for cooling; CARB names them as an off-cycle CO2 technology and treats the actuator as an output component. Smart actuators report over LIN (loss of communication: U0285); a fault usually costs fuel and warm-up time, a closed shutter can make the engine run hot under load. P05B7 means the supply of actuator B is too high – system overvoltage or a short to another circuit; the actuator switches off for protection. No manufacturer document available to us uses this code, like its shutter A counterpart. Ford monitors only undervoltage (P05B6). With P0563 check alternator and regulator first.

Likely causes

System overvoltage (regulator, jump start)
Actuator faulty internally (measuring wrong)
Supply shorted to another circuit

Symptoms

  • Check engine light on
  • Lower shutter inoperative
  • Possibly P0563 or further voltage codes

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€20–450
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

grille shutter actuator bactuator power supplyactuator wiring

Related codes

P05B5P05B6P0563P05B3P05A8

References: law.cornell.edu, fordservicecontent.com.