Prius Plus not starting / ready Help needed

Hi this is my 1st post and help is needed. Thanks

Prius Plus 2012 import, 70k miles

Tis techstream fault codes shown U0131 (steering control unit) photo added
No codes on standard diagnostic equipment
Hybrid Battery around 35%
12v battery replaced
Fuses checked.
Car stood parked for a few months.
Could be a possible power drain on the car also.
Tried jump starting also

 

When I checked the voltage under the hood. At jump point and fuses. It matched the battery voltage. It was 12.5v last I checked. Battery is drained again.
The car seems to be draining the 12v battery.

 

I have checked fuses under dash and in the engine bay. I may check them again visually and with a multimeter

 

Would a power steering control unit stop the car from starting/ready?

Posted via the PriusChat mobile app.

 

Hi i do double check to take the scan tool off.
New battery was 12.1v I manually charged it to 12.9v
While on charge the hybrid battery seem to be charging up at 0.06v. From 38% to 59% but 12v battery drain to 5v.

 

The pack voltage looks low still

 

Hi the graph is read out from hybrid diagnostic app.
The codes are from Tis techstream program

Posted via the PriusChat mobile app.

 

The fault may possibly be the voltage sensor unit on the hybrid battery. As Tis could not reset or do a diagnostic on the battery pack

Posted via the PriusChat mobile app.

 

I have had the 12v battery over 12.6v of charge and my car still doesn't start

Posted via the PriusChat mobile app.

 

Visually checked the hybrid voltage sensor and plugs for burns marks etc. They look clean

Posted via the PriusChat mobile app.

 

Manually charging the hybrid battery would be nice. It could be the next option.

Posted via the PriusChat mobile app.