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Home / DTC / B1D17 — Body Control Module — Configuration/Communication Fault

B1D17 — Body Control Module — Configuration/Communication Fault

Detailed page for trouble code B1D17.

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Code

B1D17

LAND ROVER B — Body

Body Control Module — Configuration/Communication Fault

Brand: LAND ROVER
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Corrupted or incorrect BCM software/calibration or coding
  • Loss of communication on CAN/LIN network (intermittent or no bus traffic)
  • Damaged wiring, chafed wires, or poor connector/crimp at BCM or gateway
  • Low or unstable battery/charging system voltage during coding or operation
  • Faulty BCM or gateway module hardware
  • Aftermarket device or recent module replacement without proper programming

Symptoms

  • Multiple body functions inoperative or intermittent (lights, locks, windows, wipers)
  • Warning lights or multiple communication-related DTCs displayed on scan tool
  • Remote/keyless entry not working or intermittent
  • Inability to communicate with BCM using OEM diagnostic tool
  • Random or persistent gateway/network errors

What to check

  • Read DTCs from all modules with a compatible OEM-capable scan tool; note freeze frame and event counts
  • Check battery voltage (key on and cranking) and charging system; ensure stable 12–14.5 V during testing
  • Verify BCM is present on the network (scan tool module list) and check for multiple related U-codes
  • Visually inspect BCM and gateway connectors for corrosion, moisture, damage or loose pins
  • Check CAN/LIN bus physical layer: measure voltages at CAN H and CAN L with ignition on
  • Inspect grounds and power feeds for continuity and resistance to chassis

Signal parameters

  • Battery voltage (VBATT): approx. 12.0–14.5 V (key on, engine off) — low voltage may cause faults
  • CAN bus idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V; differential ≈ 0 V when recessive
  • CAN bus dominant state: differential ≈ 2.0 V (CAN_H higher, CAN_L lower)
  • Check for valid message traffic on CAN (packets per second depend on vehicle; OEM tool shows node messages)
  • Module awake/sleep state: BCM should wake on wake request; verify expected wake-up messages

Diagnostic algorithm

  1. Capture and record all DTCs from all modules and note occurrence (permanent vs. pending). Clear codes and see if B1D17 returns.
  2. Verify battery condition and charge if needed. Ensure stable voltage while performing diagnostics.
  3. With OEM scan tool, confirm BCM is listed and check software/calibration/coding numbers. Note mismatches or 'unknown module' status.
  4. Inspect BCM and gateway connectors for corrosion, bent pins, water intrusion, and secure mating. Repair any damage.
  5. Check power and ground at the BCM: measure VBATT and ground resistance to chassis. Repair poor connections.
  6. Test CAN physical layer: measure CAN_H and CAN_L voltages at BCM and at gateway; check continuity between nodes. Repair shorts/opens.
  7. Use an oscilloscope or OEM network diagnostics to confirm message traffic and identify a node that stops communication.
  8. If wiring and bus are good, verify BCM coding/programming using manufacturer diagnostic software. Recode or reflash using latest calibration if required.
  9. If BCM fails to respond properly after correct coding and good bus, consider module replacement. Program replacement BCM with correct vehicle data and recheck network for errors.
  10. After repairs or reprogramming, clear codes and perform full system test to confirm all body functions and communication are restored.

Likely causes

  • Incorrect coding or programming after BCM replacement (most likely if module recently replaced)
  • Open/short or intermittent on CAN high/low or module power/ground
  • Battery voltage out of range or recent battery disconnection without reinitialization
  • BCM firmware corruption or internal module fault
  • Gateway or other network module preventing bus messages

Fault status

⚠️ Status
BCM configuration/communication fault. The body control module has detected incorrect configuration data or loss/interruption of communications on the vehicle network. May cause multiple body system malfunctions.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

B1D00 B1D10 U0100 U0073 U0140
320

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