Car wont start and displays ACC, RBS and Engine errors

I went to start the car this morning and it just cycled through errors. ACC, RBS and then an error saying it's not safe to use. The day before it was working without any faults at all.

I've pulled the error codes and got the following
C1776 - Heater System Failure
P1A4B - BMU
P1A83 - BMU
P1A77 - BMU

It sounds like the pump is trying to start up and struggling, so I wonder if it could be an issue with the four way valve blocking?

Anyone had a similar issue, or have any ideas?


Paul

Did you check the 12V battery? The usual culprit.
Boost it with another vehicle or battery.

Yeah I've replaced that now and cleared the codes, but it's still happening.

Got a feeling this is going to be expensive!