P05A9Active Grille Air Shutter B Position Sensor Circuit
- 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. A separately evaluated position sensor, as these titles assume, is described in Ford patents (Hall sensor on the motor or sensor on the linkage). No manufacturer document available to us uses this code: today the sensor sits inside the LIN actuator, whose faults appear as P059F/P05AE, P05A1/P05B0 or U0284/U0285. Without position feedback the shutter is usually driven open. P05A9 (shutter B) is the general circuit fault of the position sensor – signal missing or wire open, without low/high split.
- What you may notice
- Check engine light on
- Shutter stays in one position (usually open) or does not react
- Slightly higher consumption, longer warm-up in winter
- Likely causes
- LikelyPosition sensor in the actuator faulty (replaced as a unit)
- LikelyActuator connector corroded or with water ingress
- PossibleWire open in the front bumper harness (accident, rodents)
- RareEngine module or reference voltage
- 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: €30 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.