"Hybrid System Stopped Steering Power Low" any ideas why?

[PeterI]

This is the second time this message has appeared on the dash for me.

In both cases this was after reversing the car into a parking space (and doing a fair bit of steering into the space)

This last time the car had just been driven for 3 hours and the Hybrid Battery was showing a nearly full charge ('d assume the 12V would be charged up) the car was left overnight. In both cases a quick restart made the message go away but I'm starting to wonder if this is going to get worse.

Reading around suggests this is can be a low 12V Battery or a wiring loom fault.

Is this something I can use any random OBD port reader to get some clues or will I need a techstream reader to diagnose more.