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U0101 U0xxx · ネットワーク (U) 重大度高
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.
重大度の目安: 高 — 走行を止めてすぐに診断してください。さらに損傷が広がる恐れがあります
確認できる症状
- No gear engagement or limp mode
- Gearbox warning lamp
- Harsh shifts
- P0700 alongside
主な原因
可能性の高い順に並んでいます。上から順に確認してください。
- 1 TCM power or earth fault
- 2 CAN wiring fault between ECU and TCM
- 3 Failed TCM
- 4 Water ingress in the gearbox connector
点検・修理の手順
費用が安く侵襲の小さい項目から — これらのコードの大半は部品の問題ではありません。
- ✓ 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.
修理の選択肢
- Repair the power supply or CAN wiring
- Clean or replace the fluid-contaminated connector
- Replace the TCM if genuinely failed
U0101 — よくあるご質問
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.