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Home / DTC / B2879 — Body Control Module (BCM) — General electrical fault

B2879 — Body Control Module (BCM) — General electrical fault

Detailed page for trouble code B2879.

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Code

B2879

LAND ROVER B — Body

Body Control Module (BCM) — General electrical fault

Brand: LAND ROVER
Type: B — Body
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Page language: EN

Causes

  • Low or unstable battery voltage / poor battery connections
  • Blown fuse or faulty relay supplying BCM
  • Corroded, loose or damaged BCM connector or wiring harness
  • Poor or high-resistance ground(s) to BCM
  • CAN/LIN bus short, open or high resistance causing communication errors
  • Water/moisture ingress or corrosion in BCM or connectors

Symptoms

  • Multiple body functions intermittent or non-functional (door locks, windows, interior lights, wipers)
  • Warning lamps on dash (CAN/module communication warnings or general faults)
  • Intermittent loss of remote locking or alarm functions
  • Erratic lighting or instrument cluster behavior
  • Other modules reporting comms faults (U-codes) or limp behavior
  • Vehicle may not enter proper sleep/wake states or may drain battery

What to check

  • Read freeze frame and full diagnostic report with a professional Land Rover scan tool (IDS or equivalent). Note related U-codes.
  • Verify battery voltage with ignition off and during cranking (should be ~12.4–12.8 V at rest; >10 V during cranking).
  • Inspect and test fuses and relays for BCM power circuits.
  • Visually inspect BCM connectors and wiring for corrosion, bent pins, water damage and secure locking.
  • Check primary BCM ground(s) for continuity to chassis/negative battery and measure voltage drop under load (
  • Confirm CAN bus presence: scan tool shows module responses and no bus errors. If intermittent, monitor live data while exercising circuits.

Signal parameters

  • BCM main supply pin: battery voltage nominal 11.5–14.5 V (key off/on conditions vary by model).
  • BCM ground: continuity to battery negative; voltage drop under load ideally
  • CAN bus idle voltages (approx.): CANH ≈ 2.5 V, CANL ≈ 2.5 V; dominant state ~CANH 3.5–3.9 V and CANL 1.2–1.5 V (use scope for differential waveform).
  • Diagnostic (K/LIN) lines: vary by model — refer to vehicle wiring diagram; expected idle values usually near 0 V or specified wake level.
  • Wake/ignition input pins: follow vehicle-specific values (often battery voltage when active).

Diagnostic algorithm

  1. Connect an appropriate Land Rover diagnostic tool and record all stored and pending codes, freeze frame, and module communication status.
  2. Verify battery condition and terminal connections. Charge or replace weak battery before continuing.
  3. Check all BCM fuses and related relays; replace any blown components and re-test.
  4. Visually inspect BCM and nearby harness for water ingress, corrosion, rodent damage or pin deformation. Repair or replace damaged connectors/wiring.
  5. Measure BCM supply and ground at the module connector. Confirm proper voltages and low resistance ground. Repair wiring/grounds if out of specification.
  6. Check CAN/LIN bus integrity: measure idle voltages and use an oscilloscope or scan-tool bus monitor to look for noise, missing messages or bus errors. Isolate segments if needed.
  7. Disconnect non-factory accessories and retest to rule out aftermarket interference.
  8. If wiring and power/ground are good but fault persists, attempt proper module reset/clearing of codes and perform a key cycle. Re-scan for immediate return of B2879.
  9. Check for software/firmware updates or TSBs. If available, perform reflash/programming per manufacturer procedure.
  10. If fault remains after exhaustive electrical checks and software update, consider BCM replacement and programming. Follow Land Rover module programming and configuration procedures; do not install a new BCM without proper coding.
  11. After repairs or replacement, clear codes and verify full system operation and no reoccurrence after road test and multiple ignition cycles.

Likely causes

  • Loose BCM ground or battery terminal (most common and quick to check)
  • Blown fuse/relay feeding BCM power circuits
  • Corrosion or damaged BCM connector pins (moisture entry)
  • CAN bus wiring fault or terminated incorrectly by an aftermarket device
  • Internal BCM failure requiring replacement and programming

Fault status

⚠️ Status
General electrical fault recorded by the Body Control Module. Indicates the BCM has detected abnormal electrical conditions (power, ground, wiring or communication) or an internal error. May be accompanied by communication-related U-codes or multiple body system faults.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

B2870 B2810 B2835 U0100 U0140 U0155
413

Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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