Sumo help please! Horrible high pitch
 

Just got in my sumo truggy and OMG this thing has a horrible high pitched sound at all times. All thr batteries are new and I have no clue what it could be. Also, my reverse isnt working. Ive read the entire manual and messed with all the knobs and switches. Any advise. My buddy also bought one and his is making the horrible loud noise also but him reverse is working fine. Did Iget a bad car?

RE: Sumo help please! Horrible high pitch
 

its possible your car is defective.

but i believe the high pitch sound you are hearing is the PCM board. Its what takes the throttle signal from the radio and controls the voltage that goes to the motor. basically, all speed controls make some "whine" noise i would call it. But mini's and micro rc's all seem to do it worse. I recall my sumo was also loud.

on the radio, the car works in forward and steers fine, but reverse doesnt work at all(or is it just hard to get it to go reverse but sometimes it will)

I liked my sumo for the truck itself, but didnt care for the stock radio. I swapped it out for a standard traxxas AM radio. That got rid of the glitchyness.

RE: Sumo help please! Horrible high pitch
 

it won't go into reverse at all. And the loud pitch is horrible
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RE: Sumo help please! Horrible high pitch
 

the gear mesh could be too tight, that would make a bad noise.

if it doesnt go in reverse at all, no matter how you adjust the throttle trim on the radio then something (radio or PCM board) is defectrive.

RE: Sumo help please! Horrible high pitch
 

ya, It wont go into reverse no matter what