P05A5Active Grille Air Shutter A Control 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. P05A5 means the control circuit voltage is too low – typically the control line shorted to ground; the actuator cannot be driven and stays put or opens. No manufacturer document available to us uses this code. Toyota reports a short to ground as P05A2 with failure type 11.
- What you may notice
- Check engine light on
- Shutter not moving (usually open)
- Slightly higher consumption, longer warm-up
- Likely causes
- LikelyActuator motor faulty internally
- PossibleControl line shorted to ground (chafing, accident)
- PossibleCorroded connector
- RareEngine module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €80 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.