Powertrain, generic (extended)

P2C73 Active Grille Air Shutter C Stuck On

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

Debris, snow or ice holding the louvres of shutter C open
Actuator motor or gear of shutter C failed in the open position
Linkage or flap frame bent or broken, e.g. after minor front damage
Water ingress and corrosion at the bumper connector of the actuator

Symptoms

  • 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

Repair estimate

DifficultyMediumDIY possible
Parts and labour€0–600
Time0.3–2 h

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

Parts involved

active grille shutter cwiring harnessecm

Related codes

P05FEP2C74P2C75P05A0P05AFP2C76

References: static.nhtsa.gov, static.nhtsa.gov, vehicleservicepros.com, law.cornell.edu.