Open your MacBook pro. Unplug the battery connector and plug it right back in.

Step 1:-

Remove charger from your MacBook Pro and remove screws from the bottom of your MacBook Pro.

Step 2:-

MacBook Pro battery connector

Remove the lid. There is a little cable going from the battery to the connector on the motherboard (low right corner).

You just need to unplug it and plug it right back in.

Note : Do not remove your MacBook Pro battery or touch anything else on your machine.