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

P05A7 Active Grille Air Shutter A Supply Voltage Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

An active grille shutter closes louvres in the grille to cut drag and speed warm-up and opens them for cooling; CARB names it as an off-cycle CO2 technology and treats the actuator as an output component. Smart actuators (Ford 3.0 L diesel, Toyota) check their own coil and supply and report over LIN; simpler ones (VW 1.8 T) have their own supply and a control line from the engine module. GM uses none of P05A2–P05A8. A fault usually only costs fuel and warm-up time. P05A7 means the supply is present but too low. Ford's 3.0 L diesel sets it at once when the actuator measures its internal supply below 6.9 V while system voltage is 9–16.26 V, from 5 s after start – pointing to a voltage drop in feed or ground or an internal actuator fault.

Likely causes

Contact resistance in connector, wire or ground (corrosion)
Actuator faulty internally (measuring wrong)
Weak battery or charging system

Symptoms

  • Check engine light on
  • Shutter inoperative at times
  • Possibly further voltage codes

Repair estimate

DifficultyEasyDIY possible
Parts and labour€20–400
Time0.3–2 h

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

Parts involved

grille shutter actuatoractuator power supplyactuator wiring

Related codes

P05A6P05A8P0562U0284P05B6

References: fordservicecontent.com, static.nhtsa.gov.