Engine Warning Light when accelerating

I have a 2007 Range Rover 3.6 TDV8 Vogue SE which I've sort of inherited from a family member. It's spent more time SORN'd than on the road and has only covered 32,000 miles. On a recent trip to Wales the engine management light came on when I accelerated hard to overtake. I got a message on the dash to say there was a transmisson fault and the car was lowering and it then went into a "limp mode" (reduced power and limited gear changes). When I switched the car off and restarted it the message was gone and the car was back to normal. This happened 3 times in total. The car was recently serviced but I don't think it's had a gearbox oil change since new. Has anyone experienced something similar with their RR and how was it resolved?

You say sorn'd?

Did it have a battery conditioner for all that time?

With 32k she must have covered very low annual miles, so my first port of call would be the battery, either trickle charge it for 24hrs or replace it.

TBF places like Halfords will load test it for ya to check overall condition, prolly a good thing to do..

Random Phantom faults like this are often attributed to a weak or dieing battery..

The Gearbox at that age would benefit from a service, link in my sig for all the Info as the fluid change is rather in depth. compared to standard autos.

If you look in the searchbar there is loads of similar cases