I am having trouble with my 2006 Range Rover. When i turn the key everything will activate, however if I try to start it nothing will happen. I bought the Britpart diagnostic and it is giving a code that it is not recieving the signal from the key. I have tried both keys and I know the keys are working, they lock and unlock the doors just fine. It seems like the immobilizer is activated. Any thoughts?

Thanks in advance!