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Home / DTC / B142D — Body Control Module — Internal Fault

B142D — Body Control Module — Internal Fault

Detailed page for trouble code B142D.

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Code

B142D

LAND ROVER B — Body

Body Control Module — Internal Fault

Brand: LAND ROVER
Type: B — Body
Views: UK: 8 EN: 12 RU: 7
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Page language: EN

Causes

  • BCM internal hardware failure (component or board level)
  • Corrupted or failed BCM software/firmware
  • Interruption or fault on power supply (battery, main fuse, wiring)
  • Poor or intermittent ground connections
  • CAN/LIN bus communication fault or high bus error rate
  • Voltage transients or spikes damaging the module

Symptoms

  • Multiple body systems intermittent or nonfunctional (locks, lights, wipers, instrument cluster messages)
  • Illumination of fault indicator(s) or warning messages
  • Loss of communication with BCM on diagnostic tool
  • Erratic behavior of door locks, interior lighting, or alarm
  • Stored multiple related DTCs and communication errors

What to check

  • Read all stored DTCs and freeze frame data with a manufacturer-level scan tool
  • Check for additional U- or B-codes indicating network or peripheral faults
  • Verify battery voltage with engine off and during cranking (12.4–12.8 V idle, >10 V cranking)
  • Inspect BCM connector for corrosion, bent pins, water intrusion and secure fit
  • Check main body fuses, fusible links and relay feeding the BCM
  • Verify good engine/chassis ground connections and low resistance to battery negative

Signal parameters

  • Battery supply to BCM: ~12 V (key off) to ~13.5–14.5 V (engine running)
  • Ground resistance:
  • CAN high/low idle voltages: approx. CAN_H ≈ 2.5–3.5 V, CAN_L ≈ 1.5–1.5 V (differential ~0 V idle), differential ~2.5 V during active bits
  • Bus error counts and fault frames reported by diagnostic tool
  • Wake/sleep request messages present on network when keyed on

Diagnostic algorithm

  1. Retrieve all DTCs and freeze-frame data with a Land Rover–capable scan tool; note chronology and related codes.
  2. Check battery state of charge and charging system; restore proper battery voltage if low and retest.
  3. Visually inspect the BCM module and harness connectors for corrosion, water damage, bent pins, or signs of overheating; repair as needed.
  4. Verify power and ground circuits: check fuse(s), measure supply voltage at BCM power pin(s), and measure ground resistance to battery negative.
  5. Check for intermittent faults: wiggle harness at the BCM with key on and monitor for changes or additional codes.
  6. Scan the CAN/LIN network: verify the BCM appears on the bus, check message counters and error frames, and isolate any shorted/loaded branches.
  7. Attempt software reflash or perform recommended ECU/BCM software update per factory service information; clear codes and retest under different operating conditions.
  8. If communications persistently fail or internal errors recur after steps 1–7, consult manufacturer service bulletins (TSBs) for known BCM issues.
  9. As a last resort, replace the BCM with a verified unit and perform required programming/coding to vehicle specification. After replacement, verify all body functions and clear/monitor for reoccurrence of codes.
  10. Document repairs and retest vehicle for extended period to confirm fault resolved.

Likely causes

  • Failed BCM processor, memory, or internal circuitry
  • Corrupted calibration or failed software update
  • Loose, corroded or damaged BCM connector/pins
  • Blown main body fuse or fusible link feeding BCM
  • CAN bus short, missing termination or high resistance in wiring
  • Battery voltage drop during key-on or start causing module reset

Fault status

⚠️ Status
B142D - Body Control Module (BCM) internal fault detected. Investigate power/ground, network communications, software corruption, or module failure.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 2.0 - 4.0 hours

Similar codes

B142A B142B B142C B142E U0100 U0101
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