B10D0

Code

Generic B — Body

Body Control Module Internal Fault

Brand: Generic

Type: B — Body

Views: UK: 32 EN: 38 RU: 27

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Page language: EN

Causes

BCM internal hardware failure (processor, memory, internal power regulator)
Corrupted or failed BCM software/calibration
Intermittent or low vehicle battery/voltage spikes during operation or programming
Poor or corroded power/ground connections to the BCM
Water intrusion or physical damage to BCM housing or connectors
Shorts or opens in BCM input/output circuits

Symptoms

One or more body systems not functioning (door locks, lights, wipers, HVAC blower, interior lighting)
Intermittent or complete loss of keyless entry or remote functions
Security/immobilizer warnings or no-start condition linked to body functions
Warning lamps illuminated (generic or module-specific)
Erratic operation of switches or actuators controlled by BCM
Higher-than-normal parasitic battery drain

What to check

Read and record all stored DTCs and freeze-frame data from BCM and other network modules
Verify battery voltage and charging system (resting voltage and cranking voltage)
Inspect BCM connectors and wiring for corrosion, bent pins, water intrusion, or damage
Check primary fuses and relays supplying BCM power/ignition circuits
Verify good ground(s) to BCM and measure voltage drop across ground under load
Scan for related network codes (U-codes) that indicate bus or gateway issues

Signal parameters

Battery supply voltage to BCM (V) — steady 11.5–15 V expected depending on condition
Cranking voltage and voltage during fault event (V)
Module ground resistance (ohms) — low single-digit milliohms preferred
CAN bus activity and error frames (packets/sec, error counters)
BCM supply current draw (mA) — compare to known good values (watch for parasitic drain)
Freeze frame data: ignition state, voltages, temperatures, active inputs/outputs at time of fault

Diagnostic algorithm

Connect a professional scan tool and read all BCM and network DTCs; save codes and freeze-frame data.
Verify battery state-of-charge and charging system. Recharge or replace battery if low; repeat test.
Visually inspect BCM and harness for water, corrosion, physical damage, and properly seated connectors. Repair any damage.
Check and clean BCM power and ground connections; measure voltage drop under load. Repair poor connections.
Check related fuses/relays and replace as needed.
Monitor supply voltage, ground integrity, CAN bus traffic and module current draw during operation and while attempting affected functions.
If vehicle had recent software work or low-voltage event, attempt a controlled power cycle and clear codes. Re-scan to see if fault returns.
If intermittent and no external cause found, check for available BCM software updates or reflash/reprogram the BCM per OEM procedure (ensure proper battery voltage and follow security procedures).
If reflash/programming fails or internal faults persist after software attempts and wiring verified, consider BCM replacement and proper module programming/configuration. Retest all affected systems.
After repair or replacement, clear codes, confirm communication with other modules, and perform a full system test. Document findings and repairs.

Likely causes

Battery/charging system issues or a recent low-voltage event during programming
Corroded/loose power or ground connections at the BCM
Water ingress or physical damage to the BCM or connector
Failed internal BCM hardware (memory/processor)
Corrupted software needing reflash or reprogramming

Fault status

⚠️ Status

Internal fault reported by Body Control Module. Module may be in failsafe mode or have impaired functions; intermittent or persistent communications and body system faults can occur.

🔴 Repair difficulty: Hard

⏱️ Diagnostic time: 1.0-3.0 hours