Home / DTC / B1C94 — Body Control Module - Invalid/Corrupt Data Received from Module

B1C94 — Body Control Module - Invalid/Corrupt Data Received from Module

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Code

B1C94

Generic B — Body

Body Control Module - Invalid/Corrupt Data Received from Module

Brand: Generic
Type: B — Body
Views: UK: 4 EN: 2 RU: 3
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Corrupted or invalid CAN/LIN messages from another control module
  • Faulty BCM hardware (internal memory, processor)
  • Corrupted or outdated module software/firmware
  • Intermittent or low-voltage electrical supply to BCM (battery, charging issues)
  • Poor ground or intermittent connector/wiring connection to BCM or network
  • Aftermarket device or module causing bus errors

Symptoms

  • One or more body systems operate intermittently or incorrectly (locks, windows, lights, HVAC)
  • Multiple modules report errors or go into limp/limp-home mode
  • Warning lamps or messages on instrument cluster related to body systems
  • Radio, remote keyless entry, or security features malfunction
  • Inconsistent behavior that may clear after power-cycling the vehicle

What to check

  • Read freeze frame and full module list with a capable OEM-level scanner; record all related codes and timestamps
  • Scan for U-codes (network/communication) and other B codes that appeared at the same time
  • Check battery and charging system voltage and cranking voltage (13.5–14.5 V when running; no excessive drops during cranking)
  • Inspect BCM connectors for corrosion, bent pins, water intrusion, or loose terminals
  • Visually inspect CAN/LIN wiring harnesses for damage, pinch points, chafing, or rodent damage
  • Backprobe CAN high/low (or LIN) at the BCM to measure idle voltages and look for noise (typical CAN idle ~2.5 V differential; single-wire LIN voltage per manufacturer)

Signal parameters

  • CAN_H and CAN_L idle voltages (~2.5 V each, ~0 V differential)
  • CAN bus differential voltage during communication (peak ≈ 3.5 V on dominant)
  • LIN base voltage and logic transitions (model-dependent)
  • Message frequency/period for key IDs (verify expected rates)
  • Message payload length and valid CRC/checksum where applicable
  • Battery steady-state Voltage (12.0–12.8 V at rest), charging voltage while running (13.5–14.8 V)

Diagnostic algorithm

  1. Retrieve all stored codes and freeze-frame data from all modules; note occurrence patterns and related modules.
  2. Check battery and charging system; ensure stable supply voltage and good battery state-of-charge before further testing.
  3. Verify there are no service bulletins/technical updates for BCM or gateway software; obtain required OEM scan tool and procedures if an update is available.
  4. Inspect BCM connector and nearby harness for corrosion, moisture, bent pins or damage; repair connectors and re-seat securely if issues found.
  5. Scan for U-/B-codes indicating network problems (e.g., lost communication with specific modules). Use that to focus inspection on suspect module(s).
  6. With a suitable scan tool or CAN/LIN sniffer, monitor live network traffic and check message rates, IDs and payloads for malformed frames or CRC errors; log during any reproduced symptom.
  7. Measure CAN bus voltages and signals with a meter/oscilloscope to confirm proper idle levels, termination and absence of excessive noise. Repair any wiring faults, shorts or poor terminations.
  8. Perform wiggle tests of harnesses/connectors while watching live data to find intermittent opens or shorts.
  9. If a specific remote module is suspected (shows errors or abnormal messages), inspect/repair that module’s wiring and connectors; if necessary, isolate by disconnecting aftermarket modules and re-test.
  10. If wiring and connectors are good, check BCM software/firmware level and reflash or reprogram per OEM procedure. Follow manufacturer reinitialization/calibration steps after programming.
  11. After repairs or reflashes, clear codes and perform road test or reproduce conditions to confirm code does not return. If code persists and all wiring/software checks are good, consider BCM replacement as a last resort per OEM diagnostics.
  12. Document repair steps and retest; if replaced, ensure proper module pairing and any required vehicle configuration is completed.

Likely causes

  • BCM receiving malformed messages due to a failing remote module (e.g., gateway, infotainment, ECU)
  • Water intrusion or corrosion at BCM connector causing intermittent data corruption
  • Weak battery or poor charging causing transient data errors during communication
  • ECU/module with corrupted firmware sending bad payloads
  • Aftermarket remote starter/alarms interfering with network signals

Fault status

⚠️ Status
BCM detected invalid or corrupt data on the vehicle network (BCM received malformed data or reported invalid internal data). Indicates communication/data integrity fault requiring network, wiring, or module software/hardware checks.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

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Code

B1C94

LAND ROVER B — Body

Fuel tank door release relay output circuit Approach lamp circuit Alarm LED

Brand: LAND ROVER
Type: B — Body
Views: UK: 10 EN: 9 RU: 8
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Corrupted or invalid CAN/LIN messages from another control module
  • Faulty BCM hardware (internal memory, processor)
  • Corrupted or outdated module software/firmware
  • Intermittent or low-voltage electrical supply to BCM (battery, charging issues)
  • Poor ground or intermittent connector/wiring connection to BCM or network
  • Aftermarket device or module causing bus errors

Symptoms

  • One or more body systems operate intermittently or incorrectly (locks, windows, lights, HVAC)
  • Multiple modules report errors or go into limp/limp-home mode
  • Warning lamps or messages on instrument cluster related to body systems
  • Radio, remote keyless entry, or security features malfunction
  • Inconsistent behavior that may clear after power-cycling the vehicle

What to check

  • Read freeze frame and full module list with a capable OEM-level scanner; record all related codes and timestamps
  • Scan for U-codes (network/communication) and other B codes that appeared at the same time
  • Check battery and charging system voltage and cranking voltage (13.5–14.5 V when running; no excessive drops during cranking)
  • Inspect BCM connectors for corrosion, bent pins, water intrusion, or loose terminals
  • Visually inspect CAN/LIN wiring harnesses for damage, pinch points, chafing, or rodent damage
  • Backprobe CAN high/low (or LIN) at the BCM to measure idle voltages and look for noise (typical CAN idle ~2.5 V differential; single-wire LIN voltage per manufacturer)

Signal parameters

  • CAN_H and CAN_L idle voltages (~2.5 V each, ~0 V differential)
  • CAN bus differential voltage during communication (peak ≈ 3.5 V on dominant)
  • LIN base voltage and logic transitions (model-dependent)
  • Message frequency/period for key IDs (verify expected rates)
  • Message payload length and valid CRC/checksum where applicable
  • Battery steady-state Voltage (12.0–12.8 V at rest), charging voltage while running (13.5–14.8 V)

Diagnostic algorithm

  1. Retrieve all stored codes and freeze-frame data from all modules; note occurrence patterns and related modules.
  2. Check battery and charging system; ensure stable supply voltage and good battery state-of-charge before further testing.
  3. Verify there are no service bulletins/technical updates for BCM or gateway software; obtain required OEM scan tool and procedures if an update is available.
  4. Inspect BCM connector and nearby harness for corrosion, moisture, bent pins or damage; repair connectors and re-seat securely if issues found.
  5. Scan for U-/B-codes indicating network problems (e.g., lost communication with specific modules). Use that to focus inspection on suspect module(s).
  6. With a suitable scan tool or CAN/LIN sniffer, monitor live network traffic and check message rates, IDs and payloads for malformed frames or CRC errors; log during any reproduced symptom.
  7. Measure CAN bus voltages and signals with a meter/oscilloscope to confirm proper idle levels, termination and absence of excessive noise. Repair any wiring faults, shorts or poor terminations.
  8. Perform wiggle tests of harnesses/connectors while watching live data to find intermittent opens or shorts.
  9. If a specific remote module is suspected (shows errors or abnormal messages), inspect/repair that module’s wiring and connectors; if necessary, isolate by disconnecting aftermarket modules and re-test.
  10. If wiring and connectors are good, check BCM software/firmware level and reflash or reprogram per OEM procedure. Follow manufacturer reinitialization/calibration steps after programming.
  11. After repairs or reflashes, clear codes and perform road test or reproduce conditions to confirm code does not return. If code persists and all wiring/software checks are good, consider BCM replacement as a last resort per OEM diagnostics.
  12. Document repair steps and retest; if replaced, ensure proper module pairing and any required vehicle configuration is completed.

Likely causes

  • BCM receiving malformed messages due to a failing remote module (e.g., gateway, infotainment, ECU)
  • Water intrusion or corrosion at BCM connector causing intermittent data corruption
  • Weak battery or poor charging causing transient data errors during communication
  • ECU/module with corrupted firmware sending bad payloads
  • Aftermarket remote starter/alarms interfering with network signals

Fault status

⚠️ Status
BCM detected invalid or corrupt data on the vehicle network (BCM received malformed data or reported invalid internal data). Indicates communication/data integrity fault requiring network, wiring, or module software/hardware checks.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

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Key sections:
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Manual in English Pages: 494 7.1 MB
Short description

Land Rover Range Rover Electrical Library (LRL 0453ENG). Comprehensive manual covering fuse details, earth points, system descriptions, diagnostics and connector pin-outs for electrical troubleshooting and repair. Intended for technicians and service workshops.

199,00 UAH
Contents
Key sections:
  • 1 INTRODUCTION
  • 1.1 About this document
  • 1.2 Battery voltage
  • 1.3 Electrical precautions
  • 1.4 Battery disconnecting / charging
  • 1.5 Disciplines / greases
  • 1.6 Abbreviations
  • 1.7 HeVAC, sensors abbreviations
  • 1.8 How to use this document
  • 1.9 Connector detail format
  • 1.10 Fault diagnosis
  • 1.11 Wire colour codes
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+100 karma for a short comment :)
Send to email