Network, generic

U0485 Invalid Data Received From Radio

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U0485 means the radio or centre stack still transmits but a receiving module rejects its frames. GM's 2025 tables (25OBDG03B, 25OBDG04B) describe the body control module checking alive rolling counters, protection values, checksums and CRCs of centre-stack signals, among them HVAC control requests: 8 failures in 10 samples, for some signals 14 in 18 or 15 in 16, set it at least 5 s after power-up, with the partial network active for 3 s, power mode Run and over 11 V; Type B. GM PIE0807A covers a MIL with U0485 and U1962 on the 2024 Traverse and Acadia 2.5 L. Stellantis lists it in 08-046-23, 08-014-24 and 08-101-25 (Grand Cherokee, Wagoneer, Pacifica), stored by the amplifier or with a MIL; radio software cures it. U0184 is lost contact.

Likely causes

Radio or infotainment software level with known message errors, fixed by an update
Radio resetting or waking late so that counters and checksums no longer match
Low supply voltage or a disturbed bus connection to the centre stack

Symptoms

  • Radio resets, black screen or audio sources inoperative
  • Climate controls on the screen do not respond
  • MIL on some vehicles

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–600
Time0.5–2 h

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

Parts involved

radio head unit

Related codes

U0184U0334U0487U0424

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