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U0585 Invalid Data Received From Active Grille Air Shutter Module A

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

Active grille shutters close the front opening to cut drag and speed warm-up; CARB counts them as an off-cycle CO2 technology. The shutter actuator is usually a LIN slave of the engine controller. GM's 2025 ECM tables check the rolling counter, protection value and checksum of shutter module A's status frame and set U0585 after 3 bad frames in 10, with battery voltage of 11 V or more for 5 s; it is Type B, so the MIL lights after two trips, and the shutter performance test P059F waits while it is present. On the 2024 Traverse and Acadia, GM's PIT6133 traces U0585 on the upper shutter to firmware and replaces the shutter. Ford's 2014 list carries U0585 without MIL. U0284 is the lost-communication code.

Likely causes

Shutter actuator A with faulty firmware or internal fault (GM PIT6133)
LIN wiring or connector at the front end damaged or wet
Replacement actuator of the wrong variant

Symptoms

  • Check engine light on
  • Shutters stay in a fixed position
  • Slightly higher fuel consumption

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–600
Time0.5–2.5 h

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

Parts involved

active grille shutter module a

Related codes

U0284U0586P059FP05A2U058C

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