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Hello, it sounds like you have a completely dead battery bi would charge the battery before testing anything else. If the battery is bad you will need to replace it. Once you have 12v to test the system the vehicle will start. If you are still only getting 4.2v on the starter wire then you have a broken wire and will either need to find the break or overlay a new wire.
The P1260 is a theft code. Are both keys programmed to the vehicle?
It shouldn't reduce voltage but a low battery can cause your same issues. Does jump starting the vehicle make a difference.
What is the voltage of the battery?
Do you have a scan tool or a way to test for codes?
Hello, can I still offer you assistance?