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

P05B0 Active Grille Air Shutter B Position Sensor Minimum/Maximum Stop Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

Shutter B is the second active grille shutter – at GM, Ford and Stellantis the lower one in the bumper. 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. P05B0 checks whether shutter B reaches its end stops, the reference for position feedback in the self-learning run. Ford's 3.0 L diesel sets it at over 40° when learning closed, 20° when learning open or 20° in operation, after 10 s. Ford's petrol F-150 of 2024–25 uses it too: a Ford service message says to fit a new lower shutter before further diagnosis.

Likely causes

Lower shutter or actuator faulty
Louvres blocked or bent (ice, stone chips, impact)
Shutter misassembled or connector off after repair
Connector or harness corroded

Symptoms

  • Check engine light on
  • Lower shutter not moving fully
  • Possibly also P05AE

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 bgrille shutter actuator bactuator wiringengine control module

Related codes

P05A1P05AEP05B1P05AFU0285

References: fordservicecontent.com, static.nhtsa.gov, patents.google.com, vehicleservicepros.com.