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?
- No, stop and have it checked
- Estimated cost
- $0 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
P1631 Theft Deterrent Start Enable Signal Incorrect (GM) High
On General Motors vehicles (Chevrolet, GMC, Buick, Cadillac), the P1631 code means the theft deterrent start enable signal is incorrect. The engine does not start or shuts off, and the security light is on. It often appears after a computer or body module was replaced without programming.