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Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner past midnight.
How did you come to the conclusion that the runner control is stuck closed with no codes stored?
The IMRC is going to effect the engines power. When the runner is commanded open the computer expects X performance but if it gets Y instead this will effect the way the transmission operates because it to is being commanded by the computer based on getting X performance from the engine. At most a IMRC concern may cause the trans line pressure to be a little off or the time when it up or downshifts based on throttle pressure. It will not cause a harsh shift or wrong gear or slipping.
Thanks for using Just Answer, and rating me so I am compensated, Chris
I will opt out so someone else can help.