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U0351 Software Incompatibility With Active Grille Air Shutter Module D

Check engine lightUsually off
EmissionsRelevant
Drive cycleNot required
Limp modeNo

Shutter module D is the fourth address the code list reserves for grille flap actuators and is relevant only where a front end has four independently driven flap groups. U0351 signals that the engine controller will not accept the software of that unit. No manufacturer documents U0351 or says where a unit D would sit, so the position is maker-specific. What is documented around it: Hyundai already splits the lower flaps of the 2026 Palisade into left and right actuators and stores codes for modules B and C when water reaches their plugs (26-01-026H), GM swaps shutters whose firmware misreports instead of reflashing them (PIT6133), and CARB requires the active time of such off-cycle features to be logged. Part number and software level of the fitted actuator should be checked first. U028C is lost contact, U058D invalid data.

Likely causes

Flap actuator of group D with another part number or firmware fitted
Front end or bumper from another version fitted with different shutter equipment
Engine controller calibration expects a different number of shutter modules

Symptoms

  • One flap group no longer opens or closes
  • Air flap warning or check engine lamp depending on the maker
  • No noticeable change in driving

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 d

Related codes

U028CU058DU0350

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