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Home / DTC / B13B0 — Body Control Module CAN Bus Communication Fault

B13B0 — Body Control Module CAN Bus Communication Fault

Detailed page for trouble code B13B0.

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B13B0

Generic B — Body

Body Control Module CAN Bus Communication Fault

Brand: Generic
Type: B — Body
Views: UK: 5 EN: 12 RU: 4
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Page language: EN

Causes

  • Open or short in CAN High/Low wiring
  • Poor or corroded connector or ground at BCM or other module
  • Missing or failed termination resistor(s)
  • Low system battery voltage or poor battery/charging connections
  • Faulty BCM hardware or internal CAN transceiver failure
  • Intermittent connection due to bent pins, water intrusion, or damaged insulation

Symptoms

  • No communication with BCM on diagnostic scanner or intermittent communication
  • Multiple body electrical functions inoperative (locks, lights, wipers, infotainment integration)
  • Warning messages on dash about communication errors
  • Intermittent or total loss of convenience functions (remote, keyless entry, windows)
  • Other modules reporting CAN bus errors or timeout codes

What to check

  • Retrieve all stored and pending codes from all modules with a capable diagnostic tool; note freeze-frame and timestamps
  • Verify battery voltage (12.0–14.5 V) and good battery/terminal connections
  • Visually inspect BCM connector(s), CAN High/Low wiring, splices and nearby harness for damage or corrosion
  • Check for proper CAN termination: measure resistance between CAN High and CAN Low (with ignition OFF, typical ~60 ohms total or two 120 ohm in parallel)
  • Measure CAN High and CAN Low DC voltages relative to ground (resting ~2.5 V) and look for short to power or ground
  • Use oscilloscope or oscilloscope-capable scan tool to view CAN waveforms for noise, missing frames or dominant stuck state

Signal parameters

  • CAN High resting voltage ≈ 2.5 V (typically 2.5–2.7 V)
  • CAN Low resting voltage ≈ 2.5 V (typically 2.3–2.5 V); dominant recessive differential ≈ 0 V/2 V differential during traffic
  • Differential voltage during dominant bit ≈ 1.5–2.5 V (CAN_H > CAN_L)
  • Bus idle state: recessive (no dominant bits) with minimal errors
  • Message frequency and expected arbitration IDs for BCM messages (varies by vehicle)
  • Bus error/frame error rate (should be close to zero under normal conditions)

Diagnostic algorithm

  1. Connect a professional scan tool and read all modules; record B13B0 and any other related U/B codes and freeze frame data.
  2. Verify battery voltage and charging system; recharge or load-test battery if low. Clear codes and attempt to reproduce.
  3. Perform a visual inspection of BCM connectors, wiring harness for chafing, pin damage, corrosion and water intrusion. Repair any obvious damage.
  4. With ignition OFF, measure resistance across CAN_H and CAN_L at the BCM connector to confirm termination resistance. If open or out of range, trace for missing terminator or connector fault.
  5. With ignition ON, measure DC voltages of CAN_H and CAN_L at BCM connector; compare to expected (~2.5 V). Look for shorts to battery or ground.
  6. Use an oscilloscope or a CAN-capable scan tool to observe waveforms while the system is active. Look for dominant stuck states, excessive noise, or missing expected BCM frames.
  7. Isolate sections of the bus if possible: disconnect non-essential modules or remove connectors to find where communication is restored. Re-check waveform and error counters after each isolation.
  8. If wiring/termination and power/ground are good but communication still fails at the BCM, consider replacing or bench-testing the BCM or swapping with a known-good unit following manufacturer programming procedures.
  9. After repairs, reprogram/configure any replaced modules per manufacturer procedure, clear codes, and verify normal operation and absence of errors over a drive cycle.

Likely causes

  • Damaged or chafed CAN wiring between BCM and bus backbone
  • Corroded or loose multi-pin BCM connector or ground strap
  • Failed CAN transceiver inside BCM
  • Missing/failed 120 ohm termination(s) or incorrect termination value
  • Low battery/charging system voltage causing module resets

Fault status

⚠️ Status
Body Control Module reports CAN bus communication fault — lost or invalid communications on the vehicle CAN network. Check wiring, termination, power/ground, and module status.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-3.0 hours

Similar codes

U0100 U0073 U0121 B13C0 B13A0
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