This is an old thread as I now read thru this litany of C-Max trans issues. But I don't think issue is gone yet, or perhaps started anew? I had a 2013 C-Max Hybrid(91k miles no trans issue)CPO, in 2020, traded it for a 2017 C-Max hybrid(CPO) with 31k miles, since I knew they were going away and love(d) it. Funny sound started at 62k miles summer of 23. Replaced Rt CV ESP $100 deductible, 2 months later same sound required new bearings in trans, NC as part of ESP or Hybrid 100k/8yr warranty, not sure which. Now late Fall 2024, 71k miles, whirring sound again, took it to same dealer, replace rt front CV (again?), before they gave it to me they heard 'the sound' and kept it, bearings in the trans again. Fixed NC but I'm checking with FoMoCo to determine how long the warranty is, seems to only be a year. I'm checking to see if MI lemon law and/or Ford buyback will get me out of this car w/o $4-5k for repair on my dime. Both trans jobs were TSB 22-2396.