P0A08 every now and then for the last 3 years

Hi all every few months i am getting P0A08 pop up on a 2008 with high km, this happens a couple times within so many days then will not come back for up to 6 months

It will come randomly while driving, no particular pattern to where or when it comes, it might be straight after firing up the car for the first time that day or it might happen towards the end of the day..

I understand it's the 12v dc-dc circuit supplied by the inverter

The 12v battery is ordinary but still has some capacity and always above 12.2v when I check it in the morning, its the same 12v for last 3 years this has been happening! recently replaced the inverter coolant pump and the positive battery terminal junction block with fuses, cleaned negative battery lead terminals (both ends) wiggled jiggled cleaned unplugged and plugged in every connector I could find including all connectors inside passenger kick panel, but it still does it ?

Any suggestions appreciate, thanks



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