.... it has been identified that 2020 Touring vehicles equipped with RDRS (Reflex defensive rider systems) may exhibit fluctuations in idle rpm (Revolutions per minute). Some vehicles may be pronounced enough to cause customer dissatisfaction.
..... Harley-Davidson has developed an ECM update to reduce, or eliminate these fluctuations.
Service Bulletin M1500 in the Section Refers ...
Is RDRS part of traction control? If so, I wonder how it could possibly have an effect on idle speed...