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U0586 Invalid Data Received From Active Grille Air Shutter Module B

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

Vehicles with two shutter assemblies, typically one in the upper grille and one in the lower bumper opening, report the second one as module B. U0586 means the engine controller gets status frames from that actuator but cannot trust them. GM documents it in its 2025 ECM tables (25OBDG04B) with the same counter, protection value and checksum test as for module A: 3 failures in 10 frames, at least 11 V for 5 s, Type B with MIL after two trips; the B shutter performance check P05AE pauses meanwhile. GM's PIT6133 for the 2024 Traverse and Acadia links U0586 to the lower shutter and false sets from early firmware. Ford's 2014 code list also contains U0586, without MIL. U0285 is total loss of contact.

Likely causes

Lower shutter actuator B with faulty firmware or internal fault
Wiring or connector in the lower bumper area damaged by road debris or water
Upper and lower actuator swapped or wrong part fitted

Symptoms

  • Check engine light on
  • Lower shutter does not move

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 b

Related codes

U0285U0585P05AEP05B1U058D

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