B06A1

Code

Generic B — Body

Body Control Module (BCM) — Internal Memory Fault

Brand: Generic

Type: B — Body

Views: UK: 4 EN: 2 RU: 1

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Corrupted or failing non-volatile memory (EEPROM/FLASH) inside the BCM
Interrupted programming or failed reflash/update
Low or unstable battery voltage during module write operations
Water ingress, corrosion, or physical damage to BCM or connectors
Poor power or ground connections to the BCM
Internal hardware failure of the BCM

Symptoms

Stored settings (radio presets, seat/mirror memory, HVAC, convenience features) reset or lost
Intermittent or permanent loss of body functions (door locks, lights, wipers, interior modules)
Warning lamp(s) for body systems or a generic module fault illumination
Intermittent or permanent loss of communication with BCM on diagnostic tool
Unpredictable or erratic operation of relays/outputs controlled by BCM

What to check

Read and record all stored DTCs and freeze frame data with a capable scan tool
Check battery voltage and charging system (resting voltage and cranking voltage)
Inspect BCM connectors and harness for corrosion, water intrusion, bent pins, or damage
Verify solid battery negative and module ground(s) at the BCM
Check for Technical Service Bulletins (TSBs) or software updates for the BCM
Attempt to clear the code and see if it returns; note conditions when it reappears

Signal parameters

Battery/ignition supply voltage at BCM (should be stable ~12.0–14.8 V)
Module ground resistance (low ohms to chassis)
CAN bus activity and message count to/from BCM (communication present?)
Memory read/write error counters if available from diagnostics
Ignition status and wake/sleep messages to BCM

Diagnostic algorithm

Connect a full-function scan tool. Read and save all BCM and network DTCs and freeze frame data.
Check battery state-of-charge and charging. Recharge battery or perform a load test if low.
Visually inspect BCM and harness for water, corrosion, or physical damage. Repair any damaged wiring or connectors.
Verify solid power and ground at the BCM (measure voltage with key on and key off; check ground continuity to chassis).
Clear DTC(s) and cycle ignition; see if B06A1 returns. Note if code appears after specific actions (door open/close, lock/unlock, programming).
If the fault returns, check for recent module programming attempts. If an interrupted reflash is suspected, attempt a controlled reflash/update with factory or OEM-level tool, following watchouts for battery voltage and stable power supply.
If reflash not available or reflash fails, check for module-specific diagnostic parameters indicating memory errors. Use OEM diagnostics to attempt memory repair or reinitialization if supported.
If internal memory cannot be repaired by software and all power/ground and network checks are good, consider replacing the BCM. Ensure replacement BCM is programmed/configured and immobilizer/security/personalization procedures are correctly completed.
After repair or replacement, verify all retained settings, re-learn procedures, and monitor for recurrence of the fault.

Likely causes

Failed or failing BCM internal EEPROM/FLASH
Loose, corroded, or damaged BCM power/ground connector
Recent failed software update or interrupted programming session
Battery was disconnected or very low voltage while module wrote data

Fault status

⚠️ Status

B06A1 — Body Control Module internal memory fault detected. Non-volatile memory check failed or read/write errors reported. Module may not retain configurations or may exhibit communication issues.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours