B2610 — Body Control Module Communication Fault

Causes

• Battery or low supply voltage to BCM
• Blown fuse or relay feeding BCM
• Poor or corroded ground(s) at BCM
• Damaged, corroded or poorly seated BCM connectors
• Open/short in CAN/LIN wiring or connector damage
• Faulty BCM or internal module failure

Symptoms

• Communication error codes stored on scan tool
• Intermittent or complete loss of body functions (locks, lights, wipers, windows)
• Multiple modules reported as not responding or bus-off conditions
• Instrument cluster or dash messages referencing module communication
• Vehicle may not go into/exit sleep correctly; erratic behavior of convenience systems

What to check

• Capture and record DTCs and freeze frame data with a diagnostic scanner
• Check battery voltage (engine off and running), confirm >=12.4V at rest
• Inspect fuses and relays related to BCM power feed
• Visually inspect BCM connector(s) for corrosion, bent pins, or moisture
• Verify ground integrity: measure voltage drop between BCM ground and chassis during load
• Backprobe BCM power and ground pins to confirm stable supply

Signal parameters

• Battery supply at BCM: ~12.0–13.0 V (key ON); stable and within battery tolerance
• Ignition/run feed presence on BCM power pin(s) per wiring diagram
• CAN_H idle ≈ 2.5–3.5 V; CAN_L idle ≈ 2.5–1.5 V (recessive ~2.5V each, dominant: CAN_H ≈3.5V, CAN_L ≈1.5V)
• CAN differential voltage: ~0 V recessive, ~2.0 V dominant
• Termination resistance across CAN_H and CAN_L ≈ 60 ohms (two 120Ω in parallel)
• Typical CAN data rates: vehicle-specific (commonly 250 kbps or 500 kbps); confirm with manufacturer data

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