P05A8Active Grille Air Shutter A 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
- An active grille shutter closes louvres in the grille to cut drag and speed warm-up and opens them for cooling; CARB names it as an off-cycle CO2 technology and treats the actuator as an output component. Smart actuators (Ford 3.0 L diesel, Toyota) check their own coil and supply and report over LIN; simpler ones (VW 1.8 T) have their own supply and a control line from the engine module. GM uses none of P05A2–P05A8. A fault usually only costs fuel and warm-up time. P05A8 means the actuator supply is too high – an overvoltage in the system or a short to another circuit; the actuator switches off for protection. No manufacturer document available to us uses this code. Ford monitors only undervoltage (P05A7). With P0563 check the alternator and regulator first.
- What you may notice
- Check engine light on
- 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.