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
- High
- Can I keep driving?
- Yes, but with caution
- 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
U0129 Lost Communication With Brake System Control Module High
The U0129 code means other modules in the vehicle stopped receiving messages from the brake system control module. The usual effect is that brake assist features are turned off. Start with the battery, the module power and grounds, and the network wiring before you replace anything.