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Home / DTC / U0184 — Lost Communication With Radio

U0184 — Lost Communication With Radio

Detailed page for trouble code U0184.

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22,583specific
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Code

U0184

HYUNDAI U — Network/User

Lost Communication With Radio

Brand: HYUNDAI
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown radio or ECU fuse
  • Loose, corroded or damaged wiring/connectors to the radio
  • Grounding problem at the radio or chassis ground
  • Faulty radio (head unit) or internal module failure
  • Fault on the CAN or LIN network (open, short to voltage/ground, high resistance)
  • Body Control Module (BCM) or gateway/module failure

Symptoms

  • Radio does not power on or display is blank
  • No audio, loss of radio functions and presets
  • “No device” or “Radio not connected” messages on display or other modules
  • Related features (steering audio controls, navigation, Bluetooth) not working
  • Stored U0184 and possibly other U0xxx communication codes
  • Intermittent operation or works after moving wiring/connectors

What to check

  • Read all network modules with a capable scan tool; note presence/absence of the radio module
  • Check for additional U0xxx codes that indicate bus-wide issues
  • Verify battery voltage (key ON) and check for voltage at radio power and accessory circuits
  • Check fuses related to radio, ACC, and gateway/BCM
  • Visually inspect radio connectors and wiring for damage, corrosion, pushed-out pins or aftermarket splices
  • Check radio ground(s) and chassis ground connections for corrosion and tightness

Signal parameters

  • CAN bus typical idle: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V; dominant state: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V
  • Typical CAN baud rates used by vehicle networks: 250 kbps or 500 kbps (verify for specific model)
  • LIN bus: single-wire low-speed serial, nominal idle high via pull-up; wake/sleep behavior and ~19.2 kbps typical
  • Expected behavior: regular broadcast messages from radio module ID(s) on the network when powered; absence indicates loss of comms
  • Look for message frequency changes when radio turned on/off or when audio controls are used

Diagnostic algorithm

  1. Retrieve freeze-frame, complete DTC list and verify U0184 is current vs. historic.
  2. Scan the network to confirm whether the radio module is present/identified by the scan tool. Note any other U0xxx codes.
  3. Verify battery voltage (≥12.4 V at rest, ≥12 V key ON). Inspect/verify main battery and accessory power supplies to the radio (fuses, relays, ignition ACC).
  4. Inspect radio connectors and wiring for damage, corrosion, bent pins, or aftermarket splices. Repair any physical issues.
  5. Check radio ground(s) and chassis ground; clean and reseat if required.
  6. With a scope or bus monitor probe at the radio connector, confirm CAN_H/CAN_L or LIN activity with key ON and while operating controls. Compare voltages to expected ranges.
  7. If the bus is inactive, trace toward gateway/BCM: check continuity and resistance between radio connector CAN wires and gateway; inspect for shorts to battery or ground.
  8. Perform a wiggle test on harnesses while monitoring communication to reproduce intermittent faults.
  9. Remove/disconnect any aftermarket radios or amplifiers and retest.
  10. If power, grounds and bus wiring are good but no communication exists, attempt factory reset or software reflash of the radio per dealer procedures; update BCM/gateway software if recommended.
  11. If the radio still fails to appear and wiring is verified good, replace the radio module and clear codes, then verify system operation.
  12. After repair, erase codes and perform a full network scan and function check for related systems.

Likely causes

  • Blown fuse or poor power/ground at radio
  • Damaged/loose radio connector or pin corrosion
  • CAN bus short/open or damaged shielded cable near radio
  • Faulty radio head unit (most common when power & network are good)
  • Aftermarket installation causing bus contention

Fault status

⚠️ Status
Lost communication with radio module — radio not responding to network messages (CAN/LIN).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

U0100 U0121 U0144 U0155 U0073
371

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