When you crank the engine over does the security light flash? If so, you need to reset the system, please follow this guide and the instructions below.
https://www.2carpros.com/articles/how-to-reset-a-security-system
10-Minute Immobilizer Relearn
This 10-minute relearn procedure will relearn the prerelease password and the challenge/response data between the theft deterrent module (TDM) and the engine control module (ECM).
1. Connect a scan tool to the vehicle in the pass-thru arrangement.
2. Turn ON the ignition, with the engine OFF.
3. Ensure that all power consuming devices are turned OFF on the vehicle.
4. On the Techline Terminal, select Service Programming System and follow the Techline Terminal on-screen instructions, using the Pass-Thru method. Ensure the correct programming selection is chosen based on component being replaced or programmed. For this procedure, go to the V.T.D. Vehicle Theft Deterrent Learn menu and choose the Vehicle Theft Deterrent Learn, ECM, or PK3 Replaced selection.
5. At this point the scan tool must remain connected for the duration of the 10-minute relearn procedure.
This guide may help as well:
https://www.2carpros.com/articles/starter-not-working-repair
Please go over these guides and report back.
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Tuesday, April 11th, 2023 AT 12:21 PM