Powertrain, generic (extended)

P2C74 Active Grille Air Shutter C Control Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2C74 judges the drive of grille shutter C: the command to the actuator or the feedback it returns does not fit the expected range, so the flap may move sluggishly, erratically or not at all. Hyundai is the documented user. In its 2026 Palisade and Palisade Hybrid (built May to December 2025) the lower air flap system has a left and a right actuator plus two flap sensors, and campaign 26-01-026H (revised as 26-01-026H-1 in August 2026) lists P2C74 with P05FE, P05AE and U0285. The cause there was water reaching the bumper connectors and corroding pins; the driver sees an air flap system message and the engine lamp, sometimes even a low oil warning. Repair means cleaning or replacing connectors, actuator, sensor or bumper harness. Unlike P2C73 (flap stuck open), this code points at the electrical drive path.

Likely causes

Water ingress and corroded pins at the bumper connectors of the flap actuator or sensor
Chafed or broken front bumper harness
Actuator of shutter C faulty or responding too slowly
Flap position sensor of the lower air flap faulty

Symptoms

  • Engine warning lamp and an active air flap warning message
  • Flap does not move or moves jerkily
  • Possibly an unrelated low engine oil message at the same time

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–700
Time0.5–2 h

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

Parts involved

active grille shutter cwiring harnessecm

Related codes

P05FEP2C73P2C75P05A3P05B2P2C77

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