Error 11 on 2002 GEM 4 seater

I am getting an Error 11 on 2002 GEM 4 seater. I replace the accelerator pedal. The problem went away temporarily but keeps recurring occasionally, usually when I am going from reverse to forward.

The cart will not move when the code comes up.

It resets to normal when I turn the key off then back on. Any suggestions to fix this problem permanently?