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
- Medium
- Can I keep driving?
- Yes, but with caution
- Estimated cost
- $0 to $1,200
- 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
U0421 Invalid Data Received From Ride Level Control Module Medium
The U0421 code means the suspension ride height module is sending messages, but with data that does not make sense or is out of range. The suspension may end up sitting low or feeling stiff. The module is often just passing along a bad reading from one of its own sensors.