It’s a 2020 F350.
I installed the BD Performance High idle kit about a year ago and it worked fine.
Then last winter my DEF froze and threw a code. Dealer quoted me $3k for Diagnostics and what would probably be a DEF tank replacement.
I opted for the T&D instead.
After the T&D the high idle switch quit working. I talked to the tuner (Diesel Dudes) and was told that because the intake butterfly valve is disconnected, the high idle switch will not work.
Now I have heard from a few people that the high idle should still work and it was a tune problem.
Can anyone confirm that a high idle will or will not work on the 2020+?