Messages on these cars can make things more complicated when they appear. You either need to get someone with vida or get it to a garage for a diagnosis.
can be anything from flat battery to dying alternator to CEM issue, but since you have checked those it really needs code reading and checking that the car communicate with the ECU correctly. With your CEM did you check if there has been any water marks visable at all?
If its the ECU then thats no real problem at all, can just pick up a 2nd hand ECU and get a clone onto it done by a capable garage. This is what happened to mine, seems some times these ECU's just go a bit duff.
They only other thing to check which you can do yourself is the battery in the keys.
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