Vaxhall corsa got a cdti corsa and the engine is turning however not starting,,, can you help me

U2105 = Lost Comm with Engine Control System.
The ECU, (The Brain), isn't communicating with other control units within the vehicle. This could be anything from a loose wire to a failing ECU system. Get a Good Auto-Electrician to look at it as they will have a more accurate Diagnostic system to find the problem.

try bleeding the fuel sytem you have a airlock!

check the spark plugs or the plugs cables

Check all your fuses first of all if they are all okay, then you need the computer to be reset when you battery went flat & you jump started the vehicle it would to the vehicle think you had changed the battery just needs to go to Vauxhall garage they should be able to reset then all should be working not a long or expensive job. Hope this helps Best wishes, Malcolm Campbell.

Visit the on-line store, know as reliable-store, they have the repair manuals. I'm sure you will get the solution of your problem.
2007 Opel Corsa Diesel 1 3 CDTi Engine Repair Workshop Manual PDF

images for 2008 corsa diesel cdti ecoflex belt

http://www.ebay.co.uk/itm/2009-Vauxhall-Opel-Corsa-1-3-CDTI-EGR-Valve-55219490-/221292919614

it will run from exhuast up to inlet manifold

body control module it controls electric windows some models works as a an auto shut ie press remote and it will close all windows and sun roof.

cam sensor fault. it is the most common thing to do this. some times dont leave a code on ecu.

I would check ignition/ fuel delivery/ and fouled out spark plugs. Hope this helps. Also check you have a good battery in it.