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U0140 U0xxx · 网络通信（U） 中严重度
Lost Communication with Body Control Module
The body module has dropped off the bus, taking lighting, locking, windows and wipers with it in one go.
严重程度说明： 中——已影响行驶或排放，请本周内安排检修
你会注意到的故障现象
- Lights, locks and windows all faulty
- Wipers not working
- Multiple body codes
常见原因
按可能性从高到低排列——从最上面开始查。
- 1 BCM power or earth fault
- 2 Water ingress (very common)
- 3 CAN fault
- 4 Failed BCM
如何排查
先做花钱最少、侵入最小的检查——大多数这类码不是零件问题。
- ✓ Check the BCM fuses and earths.
- ✓ Inspect for water ingress — under-dash and footwell modules flood.
- ✓ Measure CAN at the BCM connector.
- ✓ Isolate the BCM to check whether it is dragging the bus.
维修方案
- Repair supply or earth
- Dry and seal the water ingress
- Replace and code the BCM
U0140 —— 常见问题
Why did everything electrical fail at once? +
They share one module. That clustering is the diagnostic clue — it is a BCM or bus problem, not five separate faults.
Where does the water come from? +
Blocked scuttle drains, a leaking heater matrix or a bad screen seal. Fix the leak or the new module fails too.