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U0129 U0xxx · 网络通信（U） 高严重度
Lost Communication with Brake System Control Module
Communication with the brake control module is lost. On vehicles with integrated braking (regenerative or brake-by-wire) the effect is more severe than on conventional systems.
严重程度说明： 高——立即停车诊断，继续行驶有扩大损坏的风险
你会注意到的故障现象
- Brake warning lamp
- Reduced braking assistance
- Regenerative braking unavailable
常见原因
按可能性从高到低排列——从最上面开始查。
- 1 Power or earth fault at the brake module
- 2 CAN wiring fault
- 3 Failed module
- 4 Water ingress
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 fuses and supply at the brake module.
- ✓ Verify CAN signals at the connector.
- ✓ Inspect for water ingress.
- ✓ Read the brake module directly if partially reachable.
维修方案
- Repair supply or bus wiring
- Replace the brake control module
- Seal against water ingress
U0129 —— 常见问题
Is it safe to drive? +
Treat as a recovery job. Integrated braking systems lose much more than conventional ABS when they go off-line.
Does regen stop? +
Yes — the vehicle falls back to friction braking only, which changes pedal feel and range.