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, no immediate risk
- Estimated cost
- $40 to $350
- 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
P1406 EGR Valve Pintle Position Circuit (GM) Medium
On General Motors vehicles (Chevrolet, GMC, Buick, Cadillac), the P1406 code points to the EGR valve pintle position circuit. You may notice a rough idle if the valve sticks open. On other brands the same number means something else.