2011 C4 Grand Picasso - Economy Mode Active

Hi all,

I have a 2011 C4 Grand Picasso. The car wouldn't start a few days ago so changed the battery as it was trying to start but the battery wasn't having it (By the way what a pain to change the battery!!)

Now with the new battery in the dash is showing "Economy Mode Active" and whilst all the lights come in inside the car and the dash is fine the car won't try to start at all. Doesn't even try.

Has anyone had experience of this?! Thanks in advance!!