Hello Folks! I am brand new to this board, although I have been doing a lot of trolling over it the last couple of weeks. Lots of good info.
I also have a similar post on a Jaguar motor forum.
I have a 2012 RR 5.0 with an AJ 133 engine that overheated so badly that the motor needed replacement. I replaced the motor with a Jaguar AJ133, which was the same motor that was in the Rover . I swapped over the oil pan, pickup and exhaust manifolds. I used the original wiring harness from the range rover and am using the original range rover ECU and key.
I do not know why this is happening, but it will intermittently crank over and has a "cannot communicate with ecu" code.
I have tried using the other ECU from the Jaguar motor and that comes up with an "incorrect vin" code.
Do you think flashing the ECU would fix this?
Thank you in advance to anyone and everyone - suggestions or help greatly appreciated.