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. P059A (shutter A) is the general circuit fault of the position sensor – signal missing or wire open, without low/high split.
Medium severity. Can I keep driving?If the car is running normally, drive in moderation to a repair shop. If it loses power or another warning appears, do not continue.
Symptoms
- Check engine light on
- Shutter stays in one position (usually open) or does not react
- Slightly higher consumption, longer warm-up in winter
Most likely causes
- Position sensor in the actuator faulty (replaced as a unit)
- Actuator connector corroded or with water ingress
- Wire open in the front bumper harness (accident, rodents)
- Engine module or reference voltage
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
- It affects emissions.
What each character of P059A means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- 5: Speed and idle
- 9A: Specific fault in that system
Frequently asked questions
Can I keep driving with code P059A?
If the car is running normally, drive in moderation to a repair shop. If it loses power or another warning appears, do not continue.
What causes code P059A?
The most common causes are: position sensor in the actuator faulty (replaced as a unit); actuator connector corroded or with water ingress; wire open in the front bumper harness (accident, rodents).
Related codes
- P05A9Active Grille Air Shutter B Position Sensor Circuit
- P059FActive Grille Air Shutter A Performance/Stuck Off
- P05A1Active Grille Air Shutter A Position Sensor Minimum/Maximum Stop Performance
- P05A2Active Grille Air Shutter A Control Circuit/Open
- P05A0Active Grille Air Shutter A Stuck On
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.