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Home / DTC / B1107 — Body Control Module internal fault

B1107 — Body Control Module internal fault

Detailed page for trouble code B1107.

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Code

B1107

Generic B — Body

Body Control Module internal fault

Brand: Generic
Type: B — Body
Views: UK: 0 EN: 0 RU: 0
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Page language: EN

Causes

  • Internal BCM hardware failure (processor, memory, internal power regulation)
  • Corrupted or failed BCM software/firmware
  • Intermittent or low supply voltage to BCM (battery, alternator issues, poor connections)
  • Poor ground or high-resistance ground connection to BCM
  • Water intrusion, corrosion, or physical damage to BCM or connector
  • Voltage spikes or transient events (jump-starts, faulty charging system)

Symptoms

  • One or more body electrical features inoperative (lighting, locks, windows, wipers, HVAC blower, etc.)
  • Illumination of related warning lamps or multiples of body-related DTCs
  • Erratic operation of body systems (random locks, lights flashing, false alarms)
  • Loss of communication with BCM by diagnostic scanner
  • Vehicle may enter limp or reduced functionality mode for body systems

What to check

  • Record freeze frame and all stored DTCs from BCM and other modules; note history and occurrence count
  • Verify battery voltage with key on and engine running (nominal 11–14.5 V); inspect charging system
  • Check BCM power feeds and fuses for continuity and correct voltage at the module connector
  • Inspect BCM ground(s) for tightness, corrosion, and low resistance to chassis/negative battery
  • Visually inspect BCM and connector for water damage, corrosion, bent pins, or melting
  • Check for recent modifications or aftermarket devices tied into BCM circuits or vehicle bus

Signal parameters

  • BCM supply voltage (expected with key on/engine running): ~11–14.5 V
  • Ignition-switched and standby supply voltages present and stable
  • BCM ground resistance to chassis: typically low (
  • CAN high/low bus voltages and idle levels (bus active with correct bit timing and low error counts)
  • Module respond rate to scan tool queries and presence of periodic CAN messages from BCM
  • Internal module temperature or self-diagnostics if available via OEM tool

Diagnostic algorithm

  1. Connect a professional scan tool. Read and record B1107 plus any other stored codes from all modules.
  2. Check battery condition and charging system. Verify proper battery state of charge and terminal condition.
  3. With ignition on, measure BCM supply and ground at the module connector. Compare to vehicle specifications.
  4. Visually inspect BCM and connector for moisture, corrosion, bent pins, or damage. Repair or clean as needed.
  5. Inspect wiring harness routing for chafing, shorts or recent repairs. Wiggle-test connectors while monitoring for code changes.
  6. Monitor CAN/LIN bus traffic and module responses. Note communication timeouts, bus errors, or message dropouts.
  7. If voltages and wiring are good, attempt a soft reset: clear codes and cycle ignition/battery power. Re-scan to see if code returns.
  8. Check OEM service info for software updates or reflash procedures. If available, reprogram or update BCM firmware with OEM tool.
  9. If reflash fails or code persists after software update and wiring checks, consider module swap with a known-good (bench-tested) BCM to confirm internal fault.
  10. If replacement is required, follow OEM procedures for coding/pairing (anti-theft/immobilizer and vehicle configurations). Verify all body functions post-repair and clear codes, then road test.
  11. Document findings and replacement history. If intermittent, advise vehicle owner of conditions that reproduce the fault for further analysis.

Likely causes

  • Corrupted BCM software or failed internal memory
  • Low/unstable supply voltage or poor ground at BCM
  • Water intrusion or connector corrosion causing internal fault
  • Intermittent CAN/LIN communication due to wiring or connector issues
  • Partial internal hardware failure in BCM (logic or power stage)

Fault status

⚠️ Status
BCM internal fault detected (B1107). May affect body electrical functions and communication. Further diagnosis required to determine if fault is internal to module or caused by external power/communication conditions.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-4 hours

Similar codes

B1100 B1101 B1102 B1108 U0100 U0121
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