P05AEActive Grille Air Shutter B Performance/Stuck Off
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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.
- What you may notice
- 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
- Likely causes
- LikelyDebris, stones, ice or snow in the lower shutter
- LikelyLouvres unhooked or broken, rubbing on bracket or horn, impact damage
- PossibleWater or corrosion in connector or harness
- PossibleActuator B faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €0 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.