My caddy starts up then dies its says cautiously theft issue starting disabled
You probably have a problem with your VATS (Vehicle Anti-Theft System)
GM vehicles had problems with this. there is a way to bypass the VATS system. there are plenty of videos online showing you how. just be aware you won’t have a working alarm system.
The VATS system: The GM VATS (Vehicle Anti-Theft System) system uses a black pellet in the metal part of the ignition key. The VATS decoder send a ‘key OK’ signal to the PCM/ECM when the proper key is detected. Without this signal, the fuel injectors will shut down within the first 3 seconds.
The VATS problem: The VATS system may become problematic with age. Increased wear, and higher resistance due to dust and corrosion can lead to ignition key readings that prevent the vehicle from Starting
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Could be the VATS anti-theft system. Try a spare key or check the key resistor. You may need to bypass or fix the system.
See if this solves the problem.
Tester