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U0350 Software Incompatibility With Active Grille Air Shutter Module C

Check engine lightUsually off
EmissionsRelevant
Drive cycleNot required
Limp modeNo

Module C denotes one more flap actuator with its own bus address, needed where the front end splits its air openings into more sections, for example left and right lower flaps. U0350 indicates that the engine controller does not accept this unit's software. No manufacturer documents U0350 publicly. Hyundai's 2026 Palisade shows that a module C exists in practice: it drives the lower air flaps with one actuator per side, and its campaign 26-01-026H names U028B, loss of shutter module C, beside U0285 when water corrodes their connectors; which side carries the letter is not stated. GM's 2024 Traverse case shows that a shutter misreporting because of its firmware is replaced rather than reprogrammed (PIT6133). CARB treats grille shutters as active off-cycle technology. U058C is invalid data. The affected flaps stay fixed.

Likely causes

Side or lower flap actuator with another part number or firmware fitted
Left and right actuators swapped or mixed between model versions
Engine controller software expects a different shutter configuration

Symptoms

  • Air flap warning message in the cluster
  • One group of flaps remains in its last position
  • Check engine lamp may light depending on the maker

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–600
Time0.3–2 h

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

Parts involved

active grille shutter module c

Related codes

U028BU058CU0351

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