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Did you get the disconnect plug fully inserted and installed correctly at the HV battery? The number one problem is usually related to the high-voltage plug not being installed correctly or fully engaged. Double check that let me know if I.
Do you have capabilities of checking for codes in the hybrid computer or only the engine computer? Are there any in either place?
The vehicle readied on normally with the old battery but you had battery failure codes and this is why you replaced the hybrid battery is that correct? Do you have the original failure codes? And just to make sure you're 100% certain there are no codes in either the engine control computer or the body computer or the hybrid computer? Are you certain that all the cable connections to the high-voltage lines are properly installed? To have a way to test the high-voltage? Are you 100% certain that this battery is charged to a sufficient level to allow the vehicle to ready on?
Let me do some research on this problem and I will get back to you this evening with some thoughts. I have a dinner party to attend. If that's not soon enough please let me know I can opt out before I go.
Do you know the information some code that was output with the P3001 code? This particular P3001 code usually indicates a malfunction in the battery ECU. Please be advised that if you are fooling with the high-voltage battery and you're not wearing the correct protective electrical gloves or inadvertently touched the wrong things this battery can hurt you if not kill you. Can you give me some history on the vehicle leading up to this problem? Was it towed into your shop was any recent work done previously to set this particular code? You mentioned that you took a battery of a known good car and put into this car did you try switching the bad battery or the battery from your car into the donor car does the same problem occur? If the car will not ready on when turned to the start position and did previously to installing the battery retrace your steps and see if there something that you potentially overlooked safety locks bolts connectors relays and so on.