If you battery is still reading 11.8V after being charged then it needs replacing.
Only then can you actually begin fault finding as some of your codes could just be because the voltage is so low you are getting false error reports because voltage inputs are out of range.
If you do have a failed DEM then it will cause a lot of other errors as well, I know from experience on my own XC70.
Also the steering wheel angle sensor error can be caused by a low battery voltage, also saw this on my XC70 when my battery started to fail especially on a cold morning on first start, but once the engine was warm further starts did not always cause the error.
After I replaced the battery I have not had the problem.
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