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
U0121 Lost Communication with Anti-Lock Brake System (ABS) Control Module High
The U0121 code means other modules in the vehicle stopped receiving messages from the ABS module. The usual effect is that the ABS and stability control are disabled. Drive with caution and have it checked soon.