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Dave Nova
Dave Nova, Cadillac Technician
Category: Cadillac
Satisfied Customers: 1522
Experience:  ASE Master Certification. GM World Class Certification
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I have a 2004 Cadillac with these codes coming up. What is

Customer Question

I have a 2004 Cadillac with these codes coming up. What is wrong and what needs replaced?
Submitted: 9 months ago.
Category: Cadillac
Expert:  Jerry Newton replied 9 months ago.

P1629 means the ECM received the wrong theft deterrent password ***** the theft deterrent module. Does the engine start and run?

Customer: replied 9 months ago.
it does
Expert:  Jerry Newton replied 9 months ago.

What are you trying to fix, a check engine light problem or is there some other symptom?

Customer: replied 9 months ago.
I'm trying to get the check engine light off. And by doing so I will fix any problems
Expert:  Jerry Newton replied 9 months ago.

The issue here is that neither of those codes will turn on the MIL.

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