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U0101 U0xxx · 网络通信（U） 高严重度
Lost Communication with TCM (Transmission Control Module)
The engine ECU cannot talk to the transmission controller. The gearbox usually defaults to limp mode or refuses to engage.
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
- No gear engagement or limp mode
- Gearbox warning lamp
- Harsh shifts
- P0700 alongside
常见原因
按可能性从高到低排列——从最上面开始查。
- 1 TCM power or earth fault
- 2 CAN wiring fault between ECU and TCM
- 3 Failed TCM
- 4 Water ingress in the gearbox connector
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 TCM fuses, earths and the gearbox connector for fluid ingress.
- ✓ Try to talk to the TCM directly with the scan tool.
- ✓ Measure CAN at the gearbox connector.
- ✓ Inspect the harness where it passes near the exhaust or bell housing.
维修方案
- Repair the power supply or CAN wiring
- Clean or replace the fluid-contaminated connector
- Replace the TCM if genuinely failed
U0101 —— 常见问题
Why does fluid in the connector matter? +
Transmission fluid wicks along the harness and contaminates the pins — a very common cause on automatics.
Will a replacement TCM need coding? +
Almost always, plus adaptation resets. Plan for that, not just the swap.