Plug and play if it's 2011 or newer.

 

Not sure if you dad's car is having the same issues, but the Transmission and Hill assist lights come on in my Fiesta when I accidentally try to start the car after it has been started, remote start or not. not sure what causes it, but shutting the engine off and back on resets it. I have taken it to the dealer a couple of times and they could not find anything wrong with it. Ford engineers told them it's a software glitch and not to try to start the car after it has been started already.

I am now careful to just move the key to the ON position and no further and the issue does not occur.

 

I'll check it out next time I see him, but it sounds a little different. I believe he sees the error when he stops at a light, after already driving.