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Home / DTC / B2398 — Body Control Module (BCM) — Internal Fault

B2398 — Body Control Module (BCM) — Internal Fault

Detailed page for trouble code B2398.

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B2398

LAND ROVER B — Body

Body Control Module (BCM) — Internal Fault

Brand: LAND ROVER
Type: B — Body
Views: UK: 15 EN: 20 RU: 10
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Page language: EN

Causes

  • BCM internal hardware failure (processor, memory, or internal power regulator)
  • Corrupted BCM firmware or failed software update
  • Intermittent or low vehicle battery voltage / poor ground
  • Short, open or high resistance in power or ground circuits to the BCM
  • Severe electrical transient (voltage spike) or water intrusion causing internal damage
  • CAN/LIN bus or communication errors causing the BCM to enter fault state

Symptoms

  • Multiple body systems not working or operating erratically (lighting, locks, windows, wipers, HVAC controls)
  • Warning lamp(s) illuminated on instrument cluster
  • Loss of communication with BCM on diagnostic tool
  • Intermittent faults that clear temporarily (self-reset)
  • Vehicle may fail to enter/exit security/immobilizer states

What to check

  • Verify battery state of charge and charging system output (battery fully charged, alternator charging properly)
  • Check BCM supply fuse(s) and fusible links for proper condition
  • Inspect BCM connectors and wiring for corrosion, damage, or water ingress; ensure secure mating
  • Scan for other DTCs and check for loss-of-communication (U codes) on CAN/LIN
  • Check grounds at BCM and related chassis ground points for tightness and low resistance
  • Confirm whether a recent software update or module replacement was attempted

Signal parameters

  • Battery supply to BCM: steady ~12.6V (engine off) and ~13.5–14.8V (engine running)
  • Ground resistance at BCM:
  • CAN bus differential voltage: ~2.5V idle bias on CAN_H and CAN_L (measure with scope or bus tool)
  • CAN traffic: valid periodic messages from BCM and other modules (packets/sec)
  • Wake/sleep line activity: ignition/wakeup signals present when expected
  • Watchdog/reset flags or internal CRC/EEPROM error counters (if available via manufacturer data)

Diagnostic algorithm

  1. Read DTCs and freeze frame data with a full dealer-level or OE-capable scan tool; record all stored and pending codes.
  2. Check battery voltage and charging system. Recharge or load-test battery if voltage low. Retest after proper battery condition.
  3. Visually inspect BCM area for water damage, corrosion, loose connectors, or physical damage. Repair connector or sealing issues.
  4. Verify fuses and power/ground circuits to BCM for continuity and proper voltage under load. Repair any wiring faults.
  5. Check CAN/LIN bus wiring and connectors for shorts/opens. Use a scope or bus analyser to confirm valid bus activity and message integrity.
  6. Clear codes and attempt reinitialization / wake cycle. If code returns immediately or communication is lost, note behavior.
  7. If recent software reflash attempted, confirm correct software level and retry reflash with latest OEM tool and procedure. Follow required coding/initialization steps.
  8. If diagnostics point to internal module failure (persistent B2398 after power/communication and software verified), consider BCM replacement using OEM part and perform required programming/coding.
  9. After repair or BCM replacement, reprogram/configure per manufacturer procedure, then clear codes and road-test to confirm repair.

Likely causes

  • Lost or corrupted BCM firmware (failed update)
  • Intermittent battery/charging system voltage or poor ground at BCM
  • Internal BCM hardware failure (memory/processor)
  • Poor connector pin contact or damaged wiring to BCM
  • CAN bus short or high error rate causing internal watchdog resets

Fault status

⚠️ Status
BCM internal fault — internal hardware/firmware error detected. Module may be non-functional or reporting corrupted memory/processor state.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

B2397 B2399 B1000 U0100 U0422
160

Browse 160 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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