My ecm module can't get my key to program?

2012 BUICK VERANO
106,234 MILES • 2.6L • 6 CYL • 2WD • AUTOMATIC
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DENNIS HEN
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I replaced my ecm module with a rebuilt one now can't get my key to program to the module.why?
Feb 13, 2026 at 8:32 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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DENNIS HEN
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You trying to get my key programmed to my rebuilt ECM
Feb 14, 2026 at 8:49 AM (Merged)
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STRAILER
  • AUTOMOTIVE REPAIR CONTRIBUTOR
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When you got the rebuilt ECM was it programmed to the car? If not this is your problem, I would call these guys to help.

https://www.flashmastersecm.com/

Can I ask if the security light is flashing while you are cranking the car over? if so this will be the problem. Let me know what happens please, Ken
Feb 14, 2026 at 8:52 AM
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DENNIS HEN
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Yes
Feb 14, 2026 at 1:27 PM
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DENNIS HEN
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Security light does flash while cranking
Feb 14, 2026 at 1:29 PM
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STRAILER
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Yep, that is the security system enabled. The ECM will need to be programmed. You can have a mobile locksmith come out to do the job/program the ignition key it should cost about $250.00 of call he website above to see what they can do.
Feb 15, 2026 at 9:08 AM