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Home / DTC / U1980 — Timeout Multimedia CAN Message(Air Conditioner, Cluster, Audio)

U1980 — Timeout Multimedia CAN Message(Air Conditioner, Cluster, Audio)

Detailed page for trouble code U1980.

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Code

U1980

HYUNDAI U — Network/User

Timeout Multimedia CAN Message(Air Conditioner, Cluster, Audio)

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

Causes

  • Open, short, or high-resistance wiring in CAN bus between multimedia modules
  • Poor ground or power supply to one or more multimedia modules (HVAC, cluster, audio head unit)
  • Disconnected or corroded connectors at affected modules
  • Failed multimedia module (HVAC control unit, cluster, head unit)
  • Faulty CAN bus termination (missing or incorrect resistance)
  • Low battery or unstable supply voltage during communication

Symptoms

  • Inoperative or erratic HVAC controls or display
  • No audio, blank or frozen head unit display
  • Instrument cluster missing HVAC or audio information or showing communication warnings
  • Multiple CAN communication-related DTCs present
  • Intermittent functionality of multimedia systems (works sometimes, then fails)
  • Possible warning lamps or ‘service’ messages on cluster

What to check

  • Read all current and pending DTCs with a full OEM-capable scan tool; note U-codes and freeze frame.
  • Check battery voltage (should be ~12.4–12.8 V at rest; >13.5 V with engine running) and inspect fuses/relays feeding multimedia modules.
  • Visually inspect connectors and wiring harnesses at HVAC control module, instrument cluster, and audio head unit for corrosion, damage, or loose terminals.
  • Check module presence and CAN messages using a scan tool: confirm each multimedia module is listed and responding to requests.
  • Measure CAN bus idle voltages at a convenient connector: CAN_H and CAN_L should be approximately mid-rail (~2.4–2.7 V).
  • Measure resistance between CAN_H and CAN_L with ignition off — approximately 60 ohms (two 120Ω terminators in parallel) or as specified by manufacturer.

Signal parameters

  • CAN_H idle voltage: ~2.4–2.7 V (typical)
  • CAN_L idle voltage: ~2.4–2.7 V (typical)
  • CAN_H dominant: ~3.5 V; CAN_L dominant: ~1.5 V (approximate during traffic)
  • Differential dominant voltage: ~2.0 V (typical)
  • Termination resistance (CAN_H to CAN_L): ~60 ohms (two 120Ω terminators in parallel) or manufacturer spec
  • Common bus speeds: 250 kbps or 500 kbps depending on model — verify with factory documentation or bus analyzer

Diagnostic algorithm

  1. Connect OEM or advanced scan tool. Retrieve U1980 and all related codes (U-codes). Save freeze frame and live data.
  2. Clear codes and attempt to reproduce. Observe which modules fail to respond and when the timeout occurs.
  3. Verify battery voltage and check fuses/relays for multimedia modules. Repair or replace as needed.
  4. Inspect wiring and connectors at HVAC, cluster, and audio for physical damage, corrosion, or loose pins. Repair any issues found.
  5. Confirm each multimedia module is present on the network with the scan tool. If a module is missing, probe its power and ground circuits and related fuses.
  6. Measure CAN_H and CAN_L idle voltages at a convenient connector. If voltages are out of range, isolate the segment and inspect for shorts or opens.
  7. Check termination resistance between CAN_H and CAN_L. If not ~60 ohms, locate missing/failed terminator or shorted segment.
  8. Use an oscilloscope or CAN analyzer to capture bus traffic. Look for missing frames, repeated error frames, bus-off events, or noise coincident with the timeout.
  9. If a specific module is identified as causing errors, try disconnecting it and retest communication. If disconnection restores bus communication, replace or repair that module.
  10. If wiring and modules appear OK, check for available software updates or reflash the affected modules per factory procedure.
  11. After repairs, clear codes and perform a full system test to confirm the timeout no longer occurs under normal operating conditions.

Likely causes

  • Intermittent connector or wiring fault on multimedia CAN circuit (most common)
  • Faulty module (HVAC, cluster, or audio) not responding to CAN requests
  • CAN bus termination or short to power/ground affecting network communication
  • Low/unstable battery voltage or blown fuse supplying multimedia modules
  • Aftermarket audio/navigation unit or adapter causing bus errors

Fault status

⚠️ Status
CAN communication timeout: multimedia module (Air Conditioner, Cluster, or Audio) failed to respond on the multimedia CAN network within expected time.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.0 hours

Similar codes

U0100 U0073 U0121 U0155 U0415
371

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