Bit more detail its usually after you have been driving a long time, it brings up automatic gearbox on the centre display (and the above fault is the code thats read off it) and it will stop changing gear. Switch the ignition off and restart it quick and problem gone for possibly half an hour or if you dont do any long journeys it can be off for weeks.
Think you maybe hit the nail on the head first time.
It appears it had a new indicator switch about 9 months ago which was approximately when this problem started.
This new switch doesnt have the cruise control switchs presumably the previous one did?
Does this sound feasible?
Or if this was the case would the fault be pernamently there?