Rad City 5 Plus - no throttle - no power

[gregroe]

My rad city 5 plus 2021 powers on but there?s no power in throttle or power assist . It was working ok for a while then it seemed slow/sluggish then no power at all .  I took it into rad service and they said they fixed a wire/ sensor to brake. Took it home it worked one time then again the throttle and power assist stopped working

Any ideas?  Bad controller? Sensor?

[suspci]

No error messages? Have you tried disconnecting/reconnecting the brake switch cable or the main connector to the motor?

[Altema]

I agree with Suspci, and the symptoms sound like a brake cutoff system. Disconnect both brake sensors from the levers and give it a try. Another way of checking is your brake light: It should come on when you squeeze each of the brake levers. If the brake light stays on when you are not pulling the brake levers, your brake cutoff sensors or their wiring is at fault. If the brake light does not work at all, this will also cause the pedal assist and throttle to not work. Disconnect the taillight to diagnose this. A blown taillight/brakelight makes the controller think the brakes are on.

[mrgold35]

The wife's brand new 2 week old Radcity 5 Plus with 16 miles had the no PAS/throttle issue. Worked perfectly before that until it didn't.  Double-check all connections, brake lights, brakes, etc...  All displays worked as normal with no error codes including showing mph on speedo when spinning the rear tire by hand.  Trouble-shot with Rad chat and they eventually sent me a new controller.  A real PITA to change out the controller; but, resolved my issue.

[Jbator]

I agree with Suspci, and the symptoms sound like a brake cutoff system. Disconnect both brake sensors from the levers and give it a try. Another way of checking is your brake light: It should come on when you squeeze each of the brake levers. If the brake light stays on when you are not pulling the brake levers, your brake cutoff sensors or their wiring is at fault. If the brake light does not work at all, this will also cause the pedal assist and throttle to not work. Disconnect the taillight to diagnose this. A blown taillight/brakelight makes the controller think the brakes are on.

THANKS this was my issue, right brake sensor was causing the bike to drop power, I unplugged it and it works fine now, however, how does one repair this issue?

[Naranja_CT5+]

You have determined that by unplugging the right brake sensor fixed the problem. What if you plug the right connector to the left sensor, does the problem follows? If it does not then you know for sure that the problem is with the right brake sensor.

It doesn't seemed an expensive item to replace you just have to find the right part number.

[Bobk]

I had the same issue with my left brake sensor and Rad sent me a complete brake assembly, lever, cable and calliper. They do not sell the individual parts. You may have to purchase a complete rear brake assembly.