Wanting a bit of advice if possible.

Bought my astra sxi 1.7 diesel last November from Pentagon. Got a years warranty included (supposedly). Recently the car kept starting however would cut out immediately. Booked it in at Vauxhall (due to thinking it'd be covered under warranty) and was told I needed a CIM update and it wasn't covered under warranty so cost me £140.

Can anyone tell me a bit about this CIM, what it is and how often it'll need updating because I can't afford £140 each bloody time.

Am complaining to Pentagon as nowhere in my warranty is there any small print explaining exactly what is/is not included and there is nowhere to tell me where I can get this information.

Ok, rant over.