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Home / DTC / B2628 — Body Control Module (BCM) internal fault

B2628 — Body Control Module (BCM) internal fault

Detailed page for trouble code B2628.

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Code

B2628

LAND ROVER B — Body

Body Control Module (BCM) internal fault

Brand: LAND ROVER
Type: B — Body
Views: UK: 6 EN: 10 RU: 6
AI status
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Page language: EN

Causes

  • BCM internal hardware failure (processor, memory, power regulation)
  • Corrosion, water ingress or physical damage to BCM or connector
  • Low or unstable battery voltage, voltage spikes or poor charging system
  • Damaged wiring, short to ground or power on BCM supply circuits
  • Software corruption or failed firmware update
  • Poor or intermittent ground or power connections

Symptoms

  • Warning lamp(s) illuminated and stored BCM fault codes
  • Loss or intermittent operation of central locking, interior lighting, windows or wipers
  • Doors not locking/unlocking or keyless entry issues
  • Instrument cluster or other modules reporting communication errors
  • Unexplained battery drain or no-crank conditions if BCM controls relays
  • Multiple unrelated electrical faults appear or disappear

What to check

  • Connect a capable scan tool; read and record all stored codes and freeze frame data
  • Inspect BCM and connector for corrosion, water ingress, pin damage or loose terminals
  • Check battery state of charge and charging system voltage (should be ~12.6V resting, 13.5–14.8V running)
  • Verify power and ground at BCM harness pins with a DVOM
  • Check relevant fuses and relays for BCM power circuits
  • Check CAN/LIN bus continuity and voltages (typical idle CAN ~2.5V)

Signal parameters

  • Battery supply voltage at BCM connector (Vbatt) — stable at key ON and engine running
  • Ground continuity and voltage drop on ground strap (mV) during cranking and rest
  • CAN High/CAN Low voltages and waveform (idle ≈ 2.5V; differential ~60–120Ω bus load)
  • Wake/sleep signal logic levels from gateway or ignition inputs
  • BCM internal watchdog/reset flags or module uptime (from scan tool if available)
  • Crank/ignition state inputs and outputs for relays controlled by BCM

Diagnostic algorithm

  1. Read and record all DTCs and freeze frame data; note related U-codes or B-codes.
  2. Clear codes and attempt to re-create the fault; observe whether B2628 returns and under what conditions.
  3. Visually inspect BCM and connector for damage, corrosion, moisture, or rodent damage; repair or clean as needed.
  4. Verify battery voltage and charging system; ensure good battery terminals and measure voltage at BCM power pin with key ON and engine running.
  5. Check all BCM power and ground pins for correct voltage and low resistance to battery; perform voltage-drop tests on supply and ground while operating affected circuits.
  6. Scan the CAN bus: verify presence of expected modules, check message traffic and CAN voltage symmetry; use an oscilloscope for intermittent or noisy lines.
  7. Inspect wiring related to affected functions for shorts, opens, or chafing; perform wiggle tests while monitoring live data.
  8. If power/ground/CAN are good and wiring intact, attempt BCM software/firmware reflash or perform manufacturer-recommended reset/programming procedure (use OEM tool).
  9. If reflash/programming fails or the module continues to report internal faults, replace BCM with OEM part and program/configure per manufacturer procedures.
  10. After repair or replacement, clear codes, perform relearns/coding (immobilizer, remote, convenience settings), and verify function over time.

Likely causes

  • Failed BCM power regulator or internal component
  • Corroded connector pins or wiring shorting to chassis
  • Intermittent battery negative/positive connection
  • Failed internal memory (EEPROM/FLASH) or watchdog resets
  • Previous water ingress causing PCB damage
  • Aftermarket electrical modification causing electrical fault

Fault status

⚠️ Status
BCM internal fault detected. Module reports an internal hardware/software error; vehicle body functions and communications may be affected. Service required.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.5-3.0 hours

Similar codes

B2627 B2629 B2616 U0100 U0073 U1000
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