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I have a 2004 Cadillac with these codes coming up. What is…

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I have a 2004 Cadillac...
I have a 2004 Cadillac with these codes coming up. What is wrong and what needs replaced?
Submitted: 2 years ago.Category: Cadillac
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Answered in 38 minutes by:
3/7/2016
Cadillac Mechanic: Jerry Newton, Cadillac Technician replied 2 years ago
Jerry Newton
Jerry Newton, Cadillac Technician
Category: Cadillac
Satisfied Customers: 1,738
Experience: ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.
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P1629 means the ECM received the wrong theft deterrent password ***** the theft deterrent module. Does the engine start and run?

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Customer reply replied 2 years ago
it does
Cadillac Mechanic: Jerry Newton, Cadillac Technician replied 2 years ago

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

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Customer reply replied 2 years ago
I'm trying to get the check engine light off. And by doing so I will fix any problems
Cadillac Mechanic: Jerry Newton, Cadillac Technician replied 2 years ago

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

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