Powertrain, generic · Vehicle speed, idle control and auxiliary inputs

P05C0 Active Grille Air Shutter Module A Over Temperature

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

Shutters cut drag and speed warm-up when closed and open for cooling; CARB names them as an off-cycle CO2 technology and treats the actuator as an output component. Smart actuators report over LIN (loss of communication: U0285); a fault usually costs fuel and warm-up time, a closed shutter can make the engine run hot under load. P05C0 means the smart actuator of shutter A (the upper one) measures its control chip above 140 °C for 10 s and switches its driver off for protection. Documented only for Ford's 3.0 L diesel. Usual causes are continuous motor load from a stiff or blocked shutter or a shorted coil, or an internal fault; it may work again after cooling.

Likely causes

Actuator faulty internally (driver overheating)
Shutter stiff or blocked (ice, dirt, bent louvres) causing continuous current
High heat load at the mounting point (radiator, traffic, towing)

Symptoms

  • Shutter inoperative at times
  • Check engine light possible
  • Possibly also a performance code

Repair estimate

DifficultyMediumDIY possible
Parts and labour€100–500
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

grille shutter actuatorengine control module

Related codes

P05C1P059FP05A2P05A7U0284

References: fordservicecontent.com, law.cornell.edu, vehicleservicepros.com.