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Home / DTC / U1982 — Timeout Multimedia CAN Message(Body CAN Signal - Camera, ECS, Trip Computer, Alternator, Auto Light)

U1982 — Timeout Multimedia CAN Message(Body CAN Signal - Camera, ECS, Trip Computer, Alternator, Auto Light)

Detailed page for trouble code U1982.

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U1982

HYUNDAI U — Network/User

Timeout Multimedia CAN Message(Body CAN Signal - Camera, ECS, Trip Computer, Alternator, Auto Light)

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

Causes

  • Faulty or powered-off sending module (camera, ECS, trip computer cluster, alternator control, auto light module).
  • Broken/shorted/poor wiring or connector between modules and Body CAN bus.
  • CAN bus electrical fault (open, short to Vb or ground, missing/incorrect termination).
  • Low or unstable battery/vehicle voltage causing modules to drop off network.
  • Intermittent faults from corrosion, water ingress or damaged harness.
  • Module software/firmware bug or unsuccessful reflash causing no transmissions.

Symptoms

  • Associated system features unavailable or degraded (camera image missing, trip computer blanks, auto lighting or alternator diagnostics disabled).
  • CAN-related warning lamp or multiple communication DTCs present.
  • Intermittent loss of function correlated with vehicle movement or vibration.
  • No signal/data for affected devices in scan tool live data or message stream.

What to check

  • Read all stored and pending DTCs and note freeze-frame data and U-codes. Clear codes and see if U1982 returns.
  • Verify battery/charging system voltage stable (12.0–14.8 V) during checks; check battery terminals.
  • Use a scan tool to monitor which module(s) report missing data and view live CAN message counters/heartbeat for the affected node.
  • Visually inspect connectors and wiring for the affected modules and gateway — look for corrosion, bent pins, moisture, or damage.
  • Measure CAN bus termination: with ignition off, measure resistance across CAN H and CAN L at vehicle-level — ~60 ohms typical (two 120Ω in parallel).
  • Probe CAN H and CAN L with oscilloscope while operating (or at key-on) to verify proper recessive/dominant waveform, expected voltages and no excessive noise.

Signal parameters

  • Message type: periodic heartbeat/telemetry on Body CAN network.
  • Expected behavior: regular periodic transmission from sending module; timeout occurs when message not received within configured interval.
  • Typical payload: short data packet containing status and sensor values; length commonly up to 8 bytes (manufacturer dependent).
  • Expected timing: periodic intervals typically in the 100 ms–1000 ms range depending on message; verify exact interval with OEM documentation or factory scan tool.
  • Physical layer: Body CAN typically operates at 125–500 kbps depending on vehicle; check vehicle-specific bus speed.
  • Voltage levels: recessive ~CANH ≈ CANL ≈ ~2.5 V; dominant shows CANH higher and CANL lower (observe with oscilloscope).

Diagnostic algorithm

  1. Retrieve all related DTCs and vehicle data with a capable scan tool and record which module/message ID is timing out. Check freeze frame and clear codes. Reproduce if possible.
  2. Confirm vehicle battery/charging health and voltage stability; recharge or reconnect as necessary.
  3. Visually inspect and physically reseat connectors at the sending module(s), gateway, and associated junctions. Repair corroded pins or harness damage.
  4. With scan tool, monitor the expected message heartbeat or relevant PIDs. Note whether the message is absent, intermittent, or present but with incorrect data.
  5. Measure CAN bus termination resistance (across CAN H/L) and confirm ~60 Ω. Repair missing or incorrect termination.
  6. Use an oscilloscope to observe CAN H and CAN L waveform and differential signal during key-on and during failed condition. Look for missing frames, excessive noise, stuck dominant or recessive, or abnormal voltages.
  7. If waveform shows wiring/physical-layer faults, isolate sections of the bus by unplugging modules/gateways one at a time while observing message presence to locate faulty segment.
  8. Inspect and test continuity of CAN H/L between the sending module and gateway; repair any shorts/opens.
  9. If wiring and terminations are good and the module fails to transmit, attempt module reset or reflash/update software per OEM procedure.
  10. If the module still does not transmit after software update and power checks, replace the suspect module and verify restoration of messages and that U1982 does not return. Document repair and recheck all related functions.

Likely causes

  • Loose/corroded connector or pin at affected module or gateway.
  • Open or shorted CAN high/low wiring in the body harness.
  • Missing or failed CAN termination resistor or additional network node interfering.
  • Failed sending module (camera, trip computer, alternator control or auto-light module).

Fault status

⚠️ Status
Timeout — expected multimedia/Body CAN message (camera, ECS, trip computer, alternator, auto light) not received within expected interval; communication with sending module interrupted.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-4.0 hours

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