Vehicle stall

[re500]

I exited the highway and at the exit signal the vehicle suddenly stopped. It does not start after that. I try jump start and no chance. Noticed that the security light is blinking. Then noticed the key is not working. Changed the battery in the key and no luck. The car dash does not say car key not detected. Any idea what is going on?

 

[Nothinghead]

It won't start as in it won't crank or it won't even turn on or it cranks but doesn't fire?

 

[bloc]

Hold the key against the start button and see whether the behavior changes.

 

[re500]

It wouldn't crank. I came back to house to get the spare key to check whether it was the key. The mechanic reset the ECU and system worked normal. Any theory on what could have happened. My hypothesis is that the battery terminal was loose and vehicle just shut down. I am not sure what caused it to enter into a immobilizer mode.