B2291

Code

LAND ROVER B — Body

Body Control Module (BCM) — Internal Memory Error

Brand: LAND ROVER

Type: B — Body

Views: UK: 15 EN: 30 RU: 17

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Page language: EN

Causes

Corrupted BCM internal memory (EEPROM/flash) or failed memory IC
Low or unstable battery/vehicle supply during read/write or programming
Water ingress, corrosion or physical damage to BCM or connector
Failed BCM hardware (internal processor or power regulation)
Interrupted or failed software update/programming
Faulty power/ground connections, blown fuse or short on supply rail

Symptoms

Illumination of warning lights related to body functions
Loss or intermittent operation of central locking, lights, wipers, interior convenience functions
Communication errors or module not responding to diagnostic tool
Multiple unrelated body/gateway DTCs recorded
Vehicle may not enter normal sleep/wake states or shows stored/active BCM errors

What to check

Read and record all stored DTCs and freeze frame data with a capable OEM or equivalent scan tool
Confirm battery state-of-charge and charging system voltage (measure at BCM and battery terminals)
Inspect BCM for water ingress, corrosion, damage and check connector pins for corrosion, bent pins or pushed out terminals
Check fuses and fusible links supplying the BCM
Verify good ground(s) at BCM mounting point(s) and continuity to chassis
Check CAN bus / LIN bus voltages and communication (CAN High/Low ~2.5 V idle) and for other modules reporting faults

Signal parameters

Battery supply to BCM: typically 11–14.5 V when engine running, >11 V at rest for stable programming
Cranking voltage: not below ~9–10 V during communication/programming attempts
CAN high/low idle: approx. 2.5 V each (differential ~0 V, CAN_H ~2.5–3.5 V, CAN_L ~1.5–2.5 V depending on vehicle)
Wake/sleep request line states as per OEM spec (verify with OEM manual)
Ground resistance: near 0 Ω to chassis (low milliohms preferred)
Memory status/checksum registers (readable with OEM tool) – may show corruption or CRC mismatch

Diagnostic algorithm

Capture all stored and pending DTCs and freeze frame data using OEM-level diagnostic tool; note history and related network codes.
Verify battery condition and charging system; charge or connect stable power supply if low. Retest after stable supply.
Visually inspect BCM and connectors for moisture, corrosion or damage; repair/clean connector and pins as required.
Verify fuses and ground continuity to BCM; repair any high resistance or open circuits.
Backprobe BCM supply and ground pins; confirm stable voltages with key on and engine running. Check CAN bus voltages and module presence on network.
If communications are intermittent, isolate CAN/LIN wiring and other modules that may be loading the bus; repair wiring faults.
Clear the DTC and attempt to recreate. If fault returns immediately or intermittently, capture exact conditions and timestamps.
Using OEM diagnostic software, read BCM internal status (memory/CRC flags, software part number). If a software corruption flag is present, attempt reflash/reprogram with latest OEM calibration following manufacturer procedures.
If reprogramming fails or is not permitted, consider replacement BCM. Replacement requires correct part number, VIN-specific programming and immobilizer/remote matching — follow OEM pairing and coding procedures.
After repair or module replacement, re-run full vehicle scan, clear codes, confirm all body functions and network communications are restored, and road/test as required.
Caution: Reprogramming or replacing BCM can affect immobilizer and remote functions. Ensure you have required security credentials, PINs and dealer/OEM tools and follow OEM procedures.

Likely causes

Battery voltage low or disconnected during a recent programming event
BCM exposed to moisture/corrosion causing memory failure
Internal BCM component or regulator failure leading to memory read/write errors
Failed/aged non‑volatile memory chip within BCM

Fault status

⚠️ Status

Internal non‑volatile memory checksum/CRC or read/write failure detected in BCM. Module may be corrupted, have hardware failure or suffering from supply/communication issues.

🔴 Repair difficulty: Hard

⏱️ Diagnostic time: 1.0-3.0 hours

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