OBD-II · Network and communication (U)
U0164
Lost communication with climate control (HVAC) module
What it means
Another module has stopped receiving messages from the heating and air-conditioning control unit.
Symptoms
- Heater or air-con controls not responding
- Blower or air-con not working
- Climate display blank
Likely causes, most likely first
| No. | Cause |
|---|---|
| 01 | weak 12V battery |
| 02 | blown climate control fuse |
| 03 | loose connector behind the climate control panel (common after radio or dashboard work) |
| 04 | failed climate control module |
| 05 | CAN or LIN wiring fault |
What to check, step by step
- 01Check 12V battery and the climate control fuse
- 02Check whether the climate module answers a scan tool
- 03Check the panel connector, especially after dashboard or radio work
- 04Test power, ground and bus wiring at the module