Daveevans0

I have had my 2012 300c parked up for 10 months (company car) I started it every week and drove up and down my drive then I went to NZ on the lions tour, when I came back after a month the battery was flat , I re charged it, started it no problem but the engine ran for only a few seconds then turned off, now it will not crank and the immobiliser light is operating. Anyone out there know how to cure this

Found the website on Google mainly because I have a problem with my 300c Diesel 2012 , the immobiliser came on the other day (flat battery). The car started but stopped after a couple of seconds now it wont even crank. Anyone know how to overcome this