There's a wiring harness that plugs in an it's missing..inspect both antenna wires for kinks or if tips break off that cause car to do that..sounds like ya lost power to esc..when you turn your car off 1st does steering go left.if so escape lost power..radiolink failsafe is a great idea,but I don't recommend using reverse cause if not done right car will runaway on ya in reverse an let me tell that can be real bad..shaft about grinded my finger off one day try to stop it

Your wireing harness isnt plugged into esc.easy fix.part for speedrunning thou.thats a damn good open wheel speed for mmx6s