"add fuel" and engine won't start after replacing/reconditioning hybrid battery.

I need help. I tried reconditioning the hybrid battery on my 2007 prius. After I put the battery back in, connected the 12v negative and the safety interlock on the battery I got a grinding noise, 3 clicks, and an "add fuel" warning message when I started the car. The engine won't come on and all dash lights are on. There is fuel in the tank.

I checked codes and I got a U0111 and a P3004. I checked the connection to the ECU and it was loose. I cleared the codes and the P3004 still remains and the same thing: 3 clicks, "add fuel" and blinking fuel light, and the engine never starts.

I don't even know where to start, is there a possible simple mistake? What is that white connector by the fan with 4 wires? I noticed that both the wires that were a bit corroded. I did use contact cleaner earlier today on that connector. Both the wires are connected to each other according to my multimeter (as in, if I test one pin, both pins on the other side beep).

The car ran fine but had a weak bank before I took the battery out and put it back in, giving a P0A80 code and a P3000 code. I should also mention that I've had the battery out for 9 days. I do remember it was very, very difficult for me to remove those 3 cables from the battery.

 

I was able to check the codes and I got a UA111 data bus, battery energy control module A, no communication (which I was able to fix by pushing on it harder) and P3004 (which I can't resolve and all of the symptoms are the same as before).

 

I didn't have any of these errors before removing, reconditioning, balancing and putting the pack back in. I can't find anyone else with a P3004 error and car not starting and showing all lights after attempting to recondition the battery. What could have gone wrong? The screen does show the hybrid battery at about 75% full when it comes on. The module voltage is about 7.96v, it was 7.98v when I took it out. I replaced all the bus bars and nuts and was very careful with each one. What troubleshooting should I do? What could have gone wrong? I'm at a total loss and I think I just totaled the car.

 

Update: I used a multimeter to test the two high voltage terminals WITH the interlock fully seated and either my voltmeter isn't working or there is 0 volts across the terminals.Wouldn't there be at least some voltage even if the interlock wasn't connected? What could break the circuit at 0.0 volts at the terminals?

 

Solved, I took the case back off the battery and tested the voltages across the cells until it went to 0. I was careless and tired last night when I was reassembling the battery and had forgotten to put one of the bus bars on. The bus bar was before the interlock in the circuit. Battery appears to be working fine now with no codes. Now I just have a cylinder misfire on cylinders 1 and 2 when I start the engine cold, which I had before. I'll start a new thread for that, but I've already replaced all 4 spark plugs, ignition coils, the MAF, and cleaned the throttle body as well as ran liqui moly Engine flush. The engine had previously ran completely dry of oil and had almost seized.