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Home / DTC / B2989 — Body Control Module (BCM) Communication/Configuration Fault

B2989 — Body Control Module (BCM) Communication/Configuration Fault

Detailed page for trouble code B2989.

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Code

B2989

LAND ROVER B — Body

Body Control Module (BCM) Communication/Configuration Fault

Brand: LAND ROVER
Type: B — Body
Views: UK: 6 EN: 10 RU: 7
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Page language: EN

Causes

  • Poor or intermittent CAN/LIN network communication
  • Corroded, loose or damaged BCM connectors or wiring
  • Low or unstable battery voltage / poor ground
  • Incorrect BCM software calibration or failed software update
  • Failed or failing BCM (internal hardware fault)
  • Aftermarket device or recent module replacement not configured

Symptoms

  • Multiple body electrical functions intermittent or not working (locks, lights, wipers, etc.)
  • Warning lamps or messages on instrument cluster about module faults
  • Loss of remote locking/immobilizer or keyless functions
  • Failure to communicate with BCM via diagnostic tool
  • Some vehicle systems operating in limp/failsafe mode

What to check

  • Verify battery state of charge and system voltage (12.0–14.8 V nominal while running)
  • Scan vehicle for all stored DTCs across modules and note freeze-frame data
  • Attempt to communicate with BCM using a compatible diagnostic tool
  • Inspect BCM connectors and wiring for corrosion, damage, or water ingress
  • Check BCM power and ground pins for proper voltage and continuity
  • Check CAN/LIN bus physical condition and termination resistances

Signal parameters

  • CAN bus idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (recessive); dominant states CAN_H ~3.5–3.9 V, CAN_L ~1.1–1.5 V — differential ≈2.0 V when dominant
  • Bus termination resistance ≈ 60 Ω (two 120 Ω terminators in parallel) for standard CAN
  • LIN bus idle ~12 V with pull‑down to communicate (check with scope for expected waveform)
  • Diagnostic tool connector (OBD) must show network alive for module access
  • Battery voltage during tests should remain above ~12.4 V

Diagnostic algorithm

  1. Record all stored DTCs on every networked module. Note time stamps and any freeze-frame data.
  2. Verify battery voltage and charge if necessary. Repeat tests with a fully charged battery.
  3. Attempt to communicate with the BCM. If no communication, try a second OEM-level scan tool or different adapter.
  4. Visually inspect BCM connector(s) and nearby harness for corrosion, bent pins, water ingress, or rodent damage.
  5. With ignition on, back-probe BCM power and ground pins: verify constant battery feed, switched feed (if applicable) and solid ground continuity to chassis.
  6. Check CAN_H and CAN_L (and LIN if used) at the BCM connector with a multimeter and oscilloscope: confirm idle voltages and presence of network activity.
  7. Measure termination resistance across CAN_H/CAN_L with ignition off; expect ≈60 Ω. Inspect for shorts to battery or ground.
  8. Isolate sections of the network if needed (disconnect suspected modules one at a time) to find a node causing bus errors.
  9. If wiring and bus are good, compare BCM part number and software calibration to factory spec. Check for required software updates or module programming.
  10. If BCM was recently replaced, ensure correct configuration/coding and perform any required initialization or alignment procedures.
  11. If intermittent, perform wiggle tests on harness and connectors while monitoring bus communications and DTCs.
  12. If BCM hardware fault is confirmed after exhaustive wiring and network checks, replace BCM and program/configure per manufacturer procedure. Re-test entire network.

Likely causes

  • Open/short in CAN high/low or LIN data lines
  • Bad BCM power or ground circuit
  • Module configuration mismatch after replacement or reflashing
  • Damaged BCM connector pins or water ingress
  • Gateway/module addressing fault preventing bus communication

Fault status

⚠️ Status
Communication/configuration fault detected in Body Control Module (BCM). BCM not responding correctly on vehicle network or configuration mismatch present.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.5-3.5 hours

Similar codes

U0100 U0140 B2788 B2794 B2856 B2988
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