Hello Folks! I am brand new to this board, although I have been doing a lot of trolling over it the lat couple of weeks. Lots of good info.



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.

 

What about all the electrical components including sensors etc from the original RR engine?

 

So I used the wiring harness off the the original blown motor of the range rover, throttle body control, crank position sensor.
All the rest of the sensors are from the Jaguar

 

I am just guessing here however I would try using the sensors from the RR engine in place of the Jaguar sensors.

I would think that the problem has to be electrical and the only components that are different in your setup, from the RR engine, are the Jaguar sensors you are using.