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

P05AE Active Grille Air Shutter B Performance/Stuck Off

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. P05AE compares commanded and reached position. GM checks in two stages with five clearing attempts, type B, two trips; Ford's 3.0 L diesel at over 6° deviation in operation or 20° when learning open; Stellantis uses it too. GM, Ford and Stellantis do not distinguish the direction. GM bulletins for 2019–21 Silverado and Sierra name stones or ice at the bottom of the lower shutter, often with U0285.

Likely causes

Debris, stones, ice or snow in the lower shutter
Louvres unhooked or broken, rubbing on bracket or horn, impact damage
Water or corrosion in connector or harness
Actuator B faulty

Symptoms

  • Check engine light on (GM after two trips)
  • Lower shutter not moving or incompletely, possibly U0285 or P059F
  • Higher coolant temperature under load or slightly higher consumption

Repair estimate

DifficultyMediumDIY possible
Parts and labour€0–500
Time0.3–2 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

P059FP05AFP05B0P05B1U0285P05C1

References: gsi.ext.gm.com, gsi.ext.gm.com, fordservicecontent.com, gm-techlink.com.