Robotic/Automatic Gear Box
CITROËN C4 Coupe (LA_)

I had a damaged gear box. the local Citroen garage replace the gear box and re programed. When I am driving on automatic and on 6th gear, as soon as the car speed 127km/hr I have a “gear box faulty” warning flashing and off without any other issues and driving ok. If I put it on manual I can go on 4th, 5th gear and on 150km/hr without any warning. As soon I am going on 6th and 127km/hr the same warning but nothing else. The car still will go up on speed. The Citroen garage have re programed few times without luck. Any ideas? Thank you. George