p3030 after successful rebuild/recondition of HV Battery & new ECU

I am honestly hoping that somebody will take the time to read my trouble description here and give constructive feedback.

I have reviewed all of the archives I can find on this subject but have found none that actually covers my situation. So I hope this post will be read.

I just rebuilt and reconditioned and balanced my HV Battery in my 2003 Prius sedan.
I also replaced all of the terminal rails with new ones.
And due to burnt corroded pins and a p3001 code I replaced the HV Battery ECU.

The car runs fantastically and everything operates exactly as it is supposed to including MG1 and MG2 transmission etc..

At first I had the pleasure of having no trouble lights and no codes. But after a 60 mile run, while I was sitting in my driveway reviewing ODBII live data, the triangle and engine light popped on and my scanner found p3030 and p3006 SOC imbalance. Now p3030 won't go away.

I did a reset of the ECUs by disconnecting and reconnecting the 12v Battery (which has great voltage and passes the load test).

Live data shows that Block 19 is reading very low voltage.

So I got back into the battery assembly and reviewed and tested everything, Cells, Bus Bars, Tightness of fasteners, Terminals, Sensor wire voltage and continuity..

Everything tests good.

All 38 cells test individually at 8.2v +/-. Healthy. Including cells 37 and 38 of block 19.

I rigged up a video recorder to watch my multi-meter voltage reading for block 19 while I drive the car.

While live ODBII data is reading low 9v to 12v in block 19, my multimeter recording was showing that there is no such low voltage happening. The block is running at 16.1v to 16.5v.

This has me concerned and a bit confused and frustrated.
I am trying to pass NH safety inspection but the inspection station techs say that the state won't allow them to sticker a car if any trouble lights come up on the dash, even though they have already passed it for emissions and safety, and these lights are only battery related.

It seems to me that The HV Battery and Hybrid System is functioning and running just fine. I am just getting false sensor readings.

I am going to get back in and remove these new terminal/sensor rails, and give them a very in-depth inspection for flaws, breaks, and resistance issues.
I seriously suspect that I won't find anything, but I hope that I do.

Does anybody have any ideas as to how I can stop these false readings and trouble lights

 

I replaced the rails (harnesses) on both sides of the battery with brand new rails, that includes the terminal to the ECU.

Today is my project day for this, to inspect it for the 4rth time in a week.
But his time, I am pulling the entire harness and putting it on my workbench for a thoroughly complete inspection and testing.

Can't rule out that a brand new harness could have a flaw in it, and even though I have inspected and tested it 3 times already.

 

Thanks! I forgot to mention that I did swap out blocks, when I was retesting everything, in order to see if the problem follows. Nothing changed.

Also, though the OBDII readings are showing low voltage in Block 19, multi-tester reading reveal that that is not so. The voltage is consistent with all of the other blocks at 16.4v+.
Multi-tester readings also show that Block 19 discharges and charges consistent with all the other Blocks, so the issue seems to be a sensor issue with Block 19 providing false readings.