I did a heater core replacement on my 2017 ram 2500. After putting everything back together, I started it up just fine. The “P” was flashing green. I pressed the brake and heard a clicking sound at the ignition. It would not shift out of park and the key fob would not move to off and be removed. Need some help.

 

You have one of the two connector switch around. Switch them around. That is under the dash on the driver side. This happens a lot.

 

Have someone see if your brake lights come on when you step on the brake. I'm pretty sure you can't shift out of park unless the system believes you are pressing on the brake pedal.