I had the switch model kit in mine and it was fine for the first couple hundred miles, the dash indicator never worked right - it would indicate N in high or low. It always had great power so I knew it was working right, but I received a CEL with trans codes one day. I took the harness out & took it to the dealer - they checked it & cleared the code. Ran it for awhile w/out sport low harness - no problems then put it back in and the CEL came back on during the first ride. I was sent another harness immediately but haven't had the time to put it in yet. Just had the dealer clear the code & change out the trans sensor and have been running it w/o sport low harness for awhile. I run High most of the time anyways but I need to try the new harness to make sure it works properly..