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U058C Invalid Data Received From Active Grille Air Shutter Module C

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

A third grille shutter unit appears on vehicles that split the lower intake into several flaps. Hyundai is the clearest case: on the 2026 Palisade and Palisade Hybrid, the lower active air flaps use left and right actuators, and campaign 26-01-026H lists U028B, lost communication with shutter module C, among codes that light the engine lamp after water entered bumper connectors and corroded them. U058C covers the less drastic case where module C still sends status frames but the engine controller rejects their content. No maker publishes thresholds for U058C itself; GM's 2025 tables check counter, protection value and checksum on modules A and B (3 bad frames out of 10, Type B), a plausible pattern for C as well. With a stuck flap, warm-up and drag suffer slightly.

Likely causes

Water ingress and corrosion at the lower bumper connectors (Hyundai 26-01-026H)
Shutter actuator C with internal electronics fault
Actuator of wrong variant or position fitted after a bumper repair

Symptoms

  • Check engine light on
  • Active air flap warning message
  • Lower flaps stay in one position

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–650
Time0.5–2.5 h

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

Parts involved

active grille shutter module c

Related codes

U028BU058DU0585U0586

References: static.nhtsa.gov, gsi.ext.gm.com, law.cornell.edu.