P05B7Active Grille Air Shutter B Supply Voltage Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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.
- What you may notice
- Check engine light on
- Lower shutter inoperative
- Possibly P0563 or further voltage codes
- Likely causes
- PossibleSystem overvoltage (regulator, jump start)
- PossibleActuator faulty internally (measuring wrong)
- RareSupply shorted to another circuit
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €20 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.