2006 GS450h Check Hybrid System with battery still charging/discharging

[timmynuge]

A little back story first. My '06 GS450h first displayed the Check Hybrid System lights along with the P0A80 fault around six months ago. I replaced a faulty module in the hybrid Battery pack which resolved the issue.

 

Today while driving I heard a chime, and looked down to see the dreaded return of the Check Hybrid System lights. Interestingly, I've noticed that the hybrid Battery appears to be charging and discharging as per normal. The car drives fine and I've probably driven the car for about 100kms since the light appeared.

I hooked up my OBD2 scanner to retrieve any fault codes, which returned the below:

U0293 - Lost Communication with HV ECU

P0a7f - Hybrid Battery Pack Deterioration

U0100 - Lost Communication With Engine Control Module
 

Has anybody here seen the above codes appearing together or have any idea where to begin in trying to rectify the issue? Sadly starting to think the time has come to finally get rid of the old girl - however would like to clear this issue so I can get a decent trade on it.