P05A1Active Grille Air Shutter A Position Sensor Minimum/Maximum Stop Performance
- 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
- The active grille shutter (A = upper or only shutter, B = second) closes louvres to cut drag and speed warm-up and opens them for cooling; CARB names it as an off-cycle CO2 technology and requires its components to be monitored. P05A1 checks whether the shutter reaches its end stops (fully closed and open), which serve as reference for the position sensor in the self-learning run. Ford's 3.0 L diesel sets it at deviations above 40° when learning closed, 20° when learning open or 20° in operation, after 10 s; a Ford patent detects the stop by stall current and requests recalibration. GM, Toyota and VW do not use it.
- What you may notice
- Check engine light (depending on the maker)
- Shutter not opening or closing fully
- Possibly higher engine temperature or consumption
- Likely causes
- LikelyLouvres not reaching the stop (ice, debris, bent louvres or bracket)
- PossibleActuator or gear weak, linkage worn
- PossibleMisassembled or not learned after replacement
- RarePosition sensor in the actuator faulty
- 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: €0 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.