Triumphtigger

Can anyone help me with this? Mechanics are baffled. I have a 2015 automatic with an electric shift lever (not the conventional mechanical forward and back P N D L R lever). Engine starts okay. Then warning lights come on in sequence - transmission, then the various safety feature lights. Shift lever is dead. Car won't go into gear. Diagnostic reader implies a communication fault because it cannot access transmission fault data.

Engine runs okay. There are no engine warning lights, only the transmission light and the CMBS lights etc.

Happy to have your suggestions!