Multi-code OBD2 diagnosis
Enter all the codes your scanner showed, not just the first one. We give you the overall severity, whether you can keep driving, the order in which to check them and how they relate to each other.
Summary
- Overall severity
- Low
- Can I keep driving?
- Yes, no immediate risk
- Estimated cost
- $0 to $1,500
- Codes analyzed
- 1 of 1
The order below is the recommended one: first the codes that can cause the others. After each repair, clear the codes and check which ones come back.
Order of inspection
U0166 Lost Communication With Auxiliary Heater Control Module Low
The U0166 code means other modules in the vehicle stopped receiving messages from the auxiliary heater control module. The auxiliary heater stops working. Start with the battery, the module power and grounds, and the network wiring before you replace anything.