Sorry for the delay. I spent some time going through your other thread where you had ALOT going on to try to fix this. I’m still absorbing it all.
(for others trying to follow along)
https://community.electricforum.com/t/2005-gem-e4-error-code-21/19317
Today - Since you have a beeper that seems to be responding to your E-Brake lever(up/down) I’d say that is not the issue.
I have a few more questions-
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The other post ended with you thinking about sending the controller back to FSIP back on Jul 10. What was the outcome of that?
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What is the history of this car? Did you get it this way(not running)? or was there an identifying event that caused it to throw the original 21 code?(component swap, washed the cart, ran it into the lake?)
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Have you done anything else not listed here or in the other thread? (taken anything apart?)