I assume the engine will not crank over; can I ask if the security light is flashing when you turn the key to crank position? If everything goes out, lights etc. The battery cables are loose or corroded here is a guide to help you fix the problem:
https://www.2carpros.com/articles/everything-goes-dead-when-engine-is-cranked
If the connections are okay and the security light is flashing please reset the system which is done by removing the negative side of the battery, with the cable loose from the negative side of the battery, hold it to the positive terminal for 1 minute this will discharge the memory capacitors in the BCM and PCM allowing the system to reboot. Then reconnect the battery. Let me know how it goes.
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Saturday, February 4th, 2023 AT 12:15 PM