2005 C5 HDI 2.2 Engine Stall with Several Fault Messages

I understand as French car owners you must put up with a lot because liking some of their features. But this one disappoints most. The car is only a few
month old, done 6000 kms probably most of city start stop traffic. Now it stalls as soon as the engine warms up and I have got three or more fault messages: Engine management faulty, depolution system faulty, ESP/ARS system faulty.
Has anyone experienced this before? Is this problem common? Thanks in advance for the thoughts and suggestions
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