P2C73Active Grille Air Shutter C Stuck On
- 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
- Some vehicles split the grille opening into several separately driven flaps; shutter C is a third one next to A (usually upper) and B (lower). P2C73 says flap C stays open although the engine module asks it to close – the counterpart of P05FE, which covers a flap that will not move to its target. Nobody publishes P2C73 itself. The nearest evidence is Hyundai: the 2026 Palisade and Palisade Hybrid run two lower flap actuators (left and right) and list other shutter C codes (P05FE, P2C74) in a 2026 campaign about corroded bumper connectors. Toyota records the same fault on shutter A as P05A0 subtype 72 when debris props the louvres open. Engine cooling is unaffected; the cost is drag, slower warm-up and a warning lamp.
- What you may notice
- Engine warning lamp, sometimes a grille shutter or air flap message
- Slightly higher fuel consumption at motorway speed
- Slower engine and heater warm-up in cold weather
- Likely causes
- LikelyDebris, snow or ice holding the louvres of shutter C open
- PossibleActuator motor or gear of shutter C failed in the open position
- PossibleLinkage or flap frame bent or broken, e.g. after minor front damage
- RareWater ingress and corrosion at the bumper connector of the actuator
- 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 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.