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U0164 U0xxx · 网络通信（U） 低严重度
Lost Communication with HVAC Control Module
The climate control module is not responding. Usually a comfort problem rather than a drivability one — except on EVs where it manages battery thermal control.
严重程度说明： 低——通常不影响行驶，下次保养时处理即可
你会注意到的故障现象
- No heating or cooling control
- Climate display dead
- Blower on a default speed
常见原因
按可能性从高到低排列——从最上面开始查。
- 1 HVAC module power fault
- 2 LIN or CAN fault
- 3 Failed module
- 4 Corroded 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 HVAC fuses and the module connector.
- ✓ Determine whether it uses LIN or CAN and test accordingly.
- ✓ Inspect for water ingress near the HVAC housing.
- ✓ On EVs, check whether battery thermal management is affected.
维修方案
- Repair the power supply or wiring
- Replace the HVAC module
- Seal against water ingress
U0164 —— 常见问题
Does it matter on an EV? +
Yes — the same module often controls battery cooling and heating, so a fault can affect charging speed and range.
Can I still demist the screen? +
Usually in a default mode. Enough for safety, but not comfortable.