Code
U0189
HYUNDAI
U — Network/User
Lost Communication With Digital Disc Player/Changer Module “C”
Views:
UK: 12
EN: 18
RU: 13
AI status
Completed
Completed
100%
Causes
- Failed digital disc player/changer module (internal fault)
- Open/short or damaged CAN/infotainment bus wiring or connectors
- Poor or missing power or ground to the module (blown fuse, connector issue)
- Faulty gateway, audio head unit, or body control module interfering with messages
- Loss of bus termination or short to battery/ground on CAN lines
- Software/firmware mismatch or corrupted module software
Symptoms
- No disc player/changer operation or no disc recognition
- Audio system displays error or "No Communication" message
- Limited or no sound from sources tied to the module
- Other infotainment features behave erratically or show related U-codes
- Intermittent operation or codes return after clearing
What to check
- Read and record all U-codes and freeze frame data with a scan tool
- Verify correct vehicle battery voltage and charging system operation
- Inspect fuses and power/ground at the audio/disc changer module
- Visually inspect connectors and wiring for damage, corrosion, loose pins
- Use a scan tool to query the disc player/changer module ID and network status
- Check presence of CAN messages and module heartbeat with a capable scan tool or bus monitor
Signal parameters
- CAN bus idle voltages: recessive state ≈ 2.5 V (both lines); dominant state: CANH ≈ 3.5 V, CANL ≈ 1.5 V
- Expected bus baud rate: typically 500 kbps or 250 kbps (vehicle-specific)
- Message frequency: module heartbeat/diagnostic frames periodic (refer to service data)
- Low-battery or high-noise conditions may corrupt messages and reduce message count
Diagnostic algorithm
- Connect OEM-level scan tool. Read and record U0189 plus any related U-codes. Clear codes and attempt to reproduce.
- Confirm the module is expected on the vehicle network (refer to wiring diagrams/service manual for location and network topology).
- Verify battery voltage (engine off and running) and inspect relevant fuses/power feed circuits for the disc player/changer and head unit.
- Inspect module connectors for corrosion, bent pins, or poor engagement. Re-seat connectors and test again.
- With ignition ON, use the scan tool to query module presence. If module does not respond, perform a physical power/ground check at the module connector (voltage and ground integrity).
- Check CANH/CANL at the module connector with a meter/oscilloscope for expected recessive/dominant levels and for activity. If bus is silent, trace toward the gateway/head unit.
- If bus noise/short suspected, disconnect module and other non-critical modules one at a time to isolate the fault; measure bus resistance to check termination.
- Inspect wiring harness along the route for damage, pinch points, or shorts to chassis or battery.
- If wiring and power/ground are good but module is not responding, try software reflash/reprogramming per manufacturer procedure before replacement (check for TSBs/software updates).
- If module confirmed defective, replace the digital disc player/changer module and reprogram/configure as required. Clear codes and verify repair by road/functional test.
Likely causes
- Disconnected or corroded connector at the disc player/changer module
- Blown fuse or lost accessory power to the audio unit
- Open or shorted CANH/CANL wiring between the module and gateway/head unit
- Module internal failure preventing transmission (dead/slave device)
- Network termination failure or shorted bus causing loss of messages
Fault status
Status
Lost Communication With Digital Disc Player/Changer Module "C" — the vehicle network is not receiving expected messages from module C; audio/disc changer functionality may be disabled.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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