The DCT is an electronic controlled transmission, so any sort of wiring fault or electrical issue can mess with the DCT and it's functions.
Sounds like you need to replace that wire that is worn from messing with the subs too.
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'11 BMW E92 ///M3 - ZCP and DCT
'15 Ford F-250 - Lariat, 6.7 Powerstroke Turbo-diesel
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