B00CE

Code

Generic B — Body

Body Control Module EEPROM Read/Write Fault

Brand: Generic

Type: B — Body

Views: UK: 8 EN: 9 RU: 8

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Page language: EN

Causes

Corroded, loose or damaged power or ground connections to the BCM
Low or unstable battery/charging system voltage during memory access
Intermittent or damaged wiring or connectors on BCM power, ground or data lines
Internal BCM hardware failure (faulty EEPROM chip or controller)
Failed or incomplete software update/flash that corrupted EEPROM contents
Aftermarket accessories or improper installations interfering with vehicle electrical system

Symptoms

Multiple body system malfunctions (lighting, door locks, wipers, etc.)
Illumination of ECU/BCM warning light or general warning lamp
Intermittent or permanent loss of functions controlled by BCM
Stored or recurring DTCs related to module communication or configuration
Vehicle may fail to retain learned settings (comfort features reset)
Possible no-communication with BCM on diagnostic tool

What to check

Read all stored DTCs and freeze frame with a capable scan tool; note related codes (U or P codes)
Ensure vehicle battery is fully charged and battery/charging system health is good
Visually inspect BCM connector and harness for corrosion, bent pins, damage, moisture
Check and measure BCM power and ground voltages with key on/engine off and during operation
Scan data bus (CAN/LIN) for communication frames to/from BCM and check for errors
Check for recent software update attempts or indicated programming failures in service history

Signal parameters

BCM supply voltage (key ON): typically ~11–14.5 V; stable during memory operations
Ground resistance at BCM should be low (
CAN bus differential voltage idle: approx. 2.5 V on CAN_H/CAN_L (2.5 V each to ground, ~2.5 V difference expected during frames)
Data bus activity: valid frame rate for vehicle (verify expected TX/RX from BCM)
Current draw at BCM during key ON (compare to known good values or service data)
EEPROM read/write timing/clock pulses (if accessible) — correct waveform shape and timing when programming

Diagnostic algorithm

Record the exact code(s), diagnostic trouble code counts and any related U or P codes. Capture freeze frame and symptom conditions.
Verify battery state of charge and charging system. Recharge or connect a stable power supply if voltage is low.
Visually inspect BCM connector and harness for corrosion, moisture, damaged wires, or aftermarket splices. Repair any issues found.
With key ON, measure and record BCM supply voltages and ground continuity/resistance. Wiggle test wiring while monitoring voltage for intermittent faults.
Use a scan tool to check for communication with the BCM. If no communication, verify bus termination and other modules on the same bus.
Monitor CAN/LIN traffic and error counters. If bus errors are present, isolate wiring or another module causing bus faults.
If power, ground and bus are good, check service history for attempted programming. If an incomplete flash is suspected, attempt a controlled reprogram/reflash with OEM procedure and stable power supply.
If reprogramming fails or EEPROM read/write continues to fault, capture oscilloscope traces on EEPROM or data lines (if service documentation permits) to confirm internal memory access problem.
If diagnostics and procedures indicate internal BCM memory failure and all external causes are excluded, replace the BCM following OEM procedures (including required programming, module coding and anti-theft/immobilizer pairing).
After repair or reflash, clear codes and perform full system function check and road test to confirm issue is resolved.