Anti-theft is preventing car from starting

Hi,

If the key is correct, the problem is likely related to the immobilizer module. Here is how it works:

The system consists of a Sentry Key Immobilizer Module (SKIM), ignition key(s) equipped with a transponder chip and PCM. When the ignition switch is turned on, the SKIM interrogates the ignition key. If the ignition key is Valid or Invalid, the SKIM sends a message to the PCM indicating ignition key status. Upon receiving this message the PCM will terminate engine operation, or allow the engine to continue to operate.

Do you know if the new key was programmed to the SKIM? If it was a dealer, I would think it was, but anything is possible.

If you look at the attached pic, it explains how the SKIM is programmed with the key. If that doesn't help and has been done, then the shop should scan the can-bus system for diagnostic trouble codes. CAN stands for controller area network. The modules/computers are tied together via a few wires. This type of scan procedure should identify any issues on the vehicle. Here is a video showing how it's done:

https://youtu.be/InIlnsjOVFA

If the procedure was followed in the list below, the scan is what I would do next.

Let me know if this helps or if you have other questions.

Take care,
Joe