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
- $80 to $900
- 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
P0478 Exhaust Pressure Control Valve High Medium
The P0478 code indicates high voltage in the control circuit of the exhaust pressure control valve, from an open circuit or a short to voltage. Expect a loss of power, slow warm-up when cold and high exhaust temperature.