Got in 2018 Malibu to start it and it went dead. Got in, step on brake and press the the start button, heard one click and then nothing. No lights, brake hard to press, no power to locks, truck, windows completely black. Hooked it to a jumper box and started right up. Battery is new, battery in key fob is new. No error codes on dash. It has happen a couple of times. What could be the problem.

 

Welcome from Florida. Check your battery cables for looseness and corrosion at both ends.