Powertrain, generic (extended)

P2C76 Active Grille Air Shutter D Stuck On

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

Shutter D would be the fourth individually driven grille flap. P2C76 reports that this flap remains open when the engine module wants it shut. Not a single published document uses a shutter D: GM and Ford stop at A and B, and Hyundai's 2026 Palisade reaches C. The meaning therefore follows the stuck-open codes of the other flaps, P05A0 for A and P2C73 for C. Toyota's 2016–17 Prius illustrates the pattern on shutter A: debris lodged in the louvres kept them open, set P05A0 subtype 72 with the MIL and a dashboard message, and the cure was cleaning. An open flap leaves full cooling air, so overheating is unlikely; instead drag rises, the engine and catalyst warm up more slowly in winter, and fuel use creeps up.

Likely causes

Leaves, stones or other debris wedged in the louvres of shutter D
Actuator of shutter D failed while the flap was open
Flap frame or linkage damaged by a front impact

Symptoms

  • Engine warning lamp and possibly a grille shutter message
  • Longer warm-up and weaker heater output in winter
  • Marginally higher fuel use

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 dwiring harnessecm

Related codes

P2C77P2C78P2C73P05A0P05AF

References: static.nhtsa.gov, gm-techlink.com, fordservicecontent.com, vehicleservicepros.com.