Code
B1C94
Generic
B — Body
Body Control Module - Invalid/Corrupt Data Received from Module
Views:
UK: 4
EN: 2
RU: 3
AI status
Completed
Completed
100%
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- Corrupted or outdated module software/firmware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
- Retrieve all stored codes and freeze-frame data from all modules; note occurrence patterns and related modules.
- Check battery and charging system; ensure stable supply voltage and good battery state-of-charge before further testing.
- 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.
- Inspect BCM connector and nearby harness for corrosion, moisture, bent pins or damage; repair connectors and re-seat securely if issues found.
- Scan for U-/B-codes indicating network problems (e.g., lost communication with specific modules). Use that to focus inspection on suspect module(s).
- 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.
- 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.
- Perform wiggle tests of harnesses/connectors while watching live data to find intermittent opens or shorts.
- 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.
- 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.
- 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.
- 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
Views:
UK: 10
EN: 9
RU: 8
AI status
Completed
Completed
100%
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
- Retrieve all stored codes and freeze-frame data from all modules; note occurrence patterns and related modules.
- Check battery and charging system; ensure stable supply voltage and good battery state-of-charge before further testing.
- 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.
- Inspect BCM connector and nearby harness for corrosion, moisture, bent pins or damage; repair connectors and re-seat securely if issues found.
- Scan for U-/B-codes indicating network problems (e.g., lost communication with specific modules). Use that to focus inspection on suspect module(s).
- 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.
- 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.
- Perform wiggle tests of harnesses/connectors while watching live data to find intermittent opens or shorts.
- 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.
- 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.
- 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.
- 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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Repair manuals for LAND ROVER
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Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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0
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