I would start with the connections that are related to the codes thrown.
But lets start at the beginning.
Are you leaving the main bat power connected? We had an issue with main power being disconnected then the pedal would have to relearn all over again...it would run in limp till the pedal learned then we would get pedal response.
We left the battery wire on then cycled the ignition power several times.
Are your fuses ok? Are your grounds tight? Have to watch out that your ground bolts that are too long and bottom before putting pressure on the eyelet.
Pull the connectors and inspect the PINs.
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