U0166 — Lost Communication With Auxiliary Heater Control Module
Severity: Serious
Can you drive? With caution: limp mode possible, have it checked soon
Make: All makes (OBD-II standard)
| Meaning | Lost Communication With Auxiliary Heater Control Module. |
| Family | Network (U) |
Frequently asked questions
What does code U0166 mean?
Lost Communication With Auxiliary Heater Control Module. Lost Communication With Auxiliary Heater Control Module.
Can I keep driving with code U0166 active?
With caution: limp mode possible, have it checked soon
How do you fix code U0166?
Diagnosis starts from reading the live ECU parameters: the code points to the fault area, not to the part to replace. A vehicle-electronics specialist can test the component and clear the code after the repair.
Need help with this fault?
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Where to get it fixed
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