[nickdalzell1]

If it's the brake that failed no handheld gives a code for it (Danahar variants way back would throw a brake slipping error though)

That being said the RXVs default means of conveying an error to the user is by throwing him or her through the windshield.

Put it in Tow and key to N(on) and see if you can push it freely. If it starts fighting you, or cant move a lick it will narrow it down to the speed sensor in the motor or throttle encoder in the pedal group.