B142A

Code

LAND ROVER B — Body

Body Control Module - Configuration EEPROM Fault

Brand: LAND ROVER

Type: B — Body

Views: UK: 16 EN: 24 RU: 24

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Page language: EN

Causes

Corrupt or unreadable BCM configuration EEPROM data
Interrupted or failed software update/programming
Low or unstable battery voltage during programming or operation
Internal BCM component failure (EEPROM or controller)
Water ingress, corrosion or physical damage to BCM or connectors
Poor power/ground connections or wiring faults

Symptoms

Body electrical functions intermittent or inoperative (locks, lights, wipers, interior functions)
Fault warnings on dash or multiple related DTCs present (module comms/corruption)
Remote/keyless entry, immobiliser or alarm faults
Modules on vehicle network not responding or reporting comms faults
Stored related U‑codes for CAN communication loss
Vehicle may fail certain programmable features or personalization settings

What to check

Read all stored DTCs from BCM and other modules; record freeze frame and related U‑codes
Check battery state of charge and charging system; verify stable supply voltage (12.6V+ at rest; >11V during crank and programming)
Inspect BCM connector(s) for corrosion, bent pins, water damage or loose terminals
Check power and ground circuits to BCM for voltage drop and continuity
Verify CAN/LIN bus integrity: wiring, termination resistors and continuity; note other modules reporting communications errors
Check service history for recent software updates, module replacements or aftermarket installations

Signal parameters

Battery voltage (vehicle off and while key on)
Ignition input state to BCM (IGN_ON/ACC)
BCM internal status flags: EEPROM checksum/CRC, configuration valid/invalid (if readable via manufacturer tool)
CAN bus messages from BCM present/absent and message frequency (tx/rx counts)
Module programming status and last reflash timestamp (via dealer tool)
Ground resistance to chassis at BCM return point

Diagnostic algorithm

Record all codes from all modules with a capable scan tool; save logs/ freeze frame. 2) Verify battery voltage and health; charge or connect a diagnostic support battery to ensure >12.4V during tests. 3) Visually inspect BCM and connectors for water, corrosion or damage; repair any wiring faults or corroded terminals. 4) Check power and ground feeds to BCM with multimeter for proper voltages and low resistance. 5) Verify network communication: confirm CAN/LIN messages from BCM and absence of bus errors; repair wiring as needed. 6) Search OEM service information/TSBs for known BCM EEPROM faults and recommended reprogramming procedure. 7) If no wiring or power faults, attempt a soft reset and clear codes; if code returns, perform manufacturer-specified BCM reflash / EEPROM reprogram using dealer-level tool and correct vehicle configuration/ VIN coding. 8) After reflash, clear codes and verify all functions; monitor for recurrence. 9) If reprogramming fails or EEPROM reports hardware failure, replace BCM with a new/reconditioned unit and perform required coding/immobiliser pairing and reprogramming. 10) Retest vehicle functions and road test, then confirm no related codes return.

Likely causes

Failed or degraded EEPROM inside BCM
Incomplete or failed BCM reflash/programming event
Battery voltage below recommended level during module programming
Faulty BCM connector/terminal corrosion or intermittent power/ground
Network wiring fault causing configuration checksum errors
Previous module replacement where coding/ VIN/ configuration was not applied

Fault status

⚠️ Status

Configuration EEPROM fault detected in Body Control Module — stored configuration data invalid or unreadable. May require EEPROM reprogram, BCM reflash or module replacement.

🔴 Repair difficulty: Hard

⏱️ Diagnostic time: 1-3 hours

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B142A — Body Control Module - Configuration EEPROM Fault