P05A7Active Grille Air Shutter A Supply Voltage Circuit Low
- 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. P05A7 means the supply is present but too low. Ford's 3.0 L diesel sets it at once when the actuator measures its internal supply below 6.9 V while system voltage is 9–16.26 V, from 5 s after start – pointing to a voltage drop in feed or ground or an internal actuator fault.
- What you may notice
- Check engine light on
- Shutter inoperative at times
- Possibly further voltage codes
- Likely causes
- LikelyContact resistance in connector, wire or ground (corrosion)
- PossibleActuator faulty internally (measuring wrong)
- RareWeak battery or charging system
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €20 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.