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Home / DTC / B280100 — CAN Single Line Error M-CAN | MM CAN Single Line Error B2801XX MM CAN Single Line Error

B280100 — CAN Single Line Error M-CAN | MM CAN Single Line Error B2801XX MM CAN Single Line Error

Detailed page for trouble code B280100.

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Code

B280100

HYUNDAI B — Body

CAN Single Line Error M-CAN | MM CAN Single Line Error B2801XX MM CAN Single Line Error

Brand: HYUNDAI
Type: B — Body
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Page language: EN

Causes

  • Open, short, or high-resistance in the CAN single-wire or harness.
  • Corroded, bent, or damaged connector pins at a module or splice.
  • Loss of module power or ground affecting CAN interface.
  • Missing or failed termination or pull-up/pull-down components on the CAN line.
  • Water ingress or physical damage to wiring harness routing.
  • Faulty control module with a bad CAN transceiver.

Symptoms

  • One or more modules show communication errors or go to a default/fallback state.
  • Loss or intermittent operation of convenience features (doors, mirrors, HVAC, etc.).
  • Cluster warnings or multiple communication-related DTCs stored.
  • Inability to program or communicate with certain modules via scan tool.
  • Intermittent faults that may disappear when harness is moved (wiggle symptom).

What to check

  • Scan all control modules; record additional communication DTCs and freeze frame data.
  • Visually inspect connectors, splice points, and wiring along the CAN route for damage or corrosion.
  • Check module supply voltage and ground integrity at affected modules.
  • Measure idle bus voltage at the CAN line (see signal parameters) with respect to chassis ground.
  • Measure end-to-end bus resistance/continuity and look for unexpected shorts to power or ground.
  • Use a scan tool or oscilloscope to monitor CAN traffic and verify presence/quality of messages/waveforms.

Signal parameters

  • Single-wire CAN idle (recessive) voltage typically near ~2.5 V (varies by system).
  • Dominant state pulls the line away from idle (voltage dips); waveform should be clean with expected bit timing for the network.
  • Typical two-wire CAN differential bus resistance ≈ 60 Ω (two 120 Ω terminators in parallel).
  • Expected periodic messages from modules on the network — absence of messages indicates an open or failed node.
  • Oscilloscope should show clear recessive/dominant transitions without excessive noise or stuck levels.

Diagnostic algorithm

  1. Read and record all stored DTCs and freeze frame data from all modules; note any related U- or B-codes.
  2. Clear codes and see if B280100 returns; if intermittent, operability testing may require driving or wiggle tests.
  3. Perform a thorough visual inspection of wiring, connectors, and splice points for corrosion, moisture, or physical damage.
  4. Verify module power and ground voltages; repair any power/ground faults before further CAN testing.
  5. Measure idle voltage on the CAN single-wire at the suspect module connector; compare to known-good value or specification.
  6. Check continuity and resistance of the CAN line between modules and to termination points; look for unexpected shorts to ground or battery.
  7. Use an oscilloscope or quality CAN sniffer to view the waveform and message traffic. Identify if the line is stuck dominant/recessive or noisy.
  8. Isolate the fault by disconnecting modules or sections (one at a time) and observe whether the fault clears to locate a faulty node or harness section.
  9. Repair damaged wiring, corroded pins, or bad connectors. Replace termination/pull components if missing or failed.
  10. If wiring and connectors test good and the bus still fails, consider replacing the suspected module’s CAN transceiver and re-test.
  11. After repairs, clear codes, verify normal CAN traffic, and confirm no reoccurrence in a road test or extended monitoring.

Likely causes

  • Disconnected or corroded connector at the affected module(s).
  • Damaged wiring or chafed insulation causing intermittent open/short.
  • Failed CAN transceiver inside a body module (most common after wiring checks).
  • Blown fuse or poor ground causing module CAN transceiver to be inactive.
  • Loss of termination (open resistor or missing pull) on the single-wire network.

Fault status

⚠️ Status
MM CAN Single Line Error — communication line open/short or transceiver fault detected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0073 U0100 U0121 U0140
371

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