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

P05A1 Active Grille Air Shutter A Position Sensor Minimum/Maximum Stop Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

Louvres not reaching the stop (ice, debris, bent louvres or bracket)
Actuator or gear weak, linkage worn
Misassembled or not learned after replacement
Position sensor in the actuator faulty

Symptoms

  • Check engine light (depending on the maker)
  • Shutter not opening or closing fully
  • Possibly higher engine temperature or consumption

Repair estimate

DifficultyMediumDIY possible
Parts and labour€0–600
Time0.3–1.5 h

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

Parts involved

grille shuttergrille shutter actuatorgrille shutter position sensor

Related codes

P059FP05A0P059BP05B0P05A2

References: fordservicecontent.com, patents.google.com, law.cornell.edu.