Has anyone else experienced the truck holding throttle/rpm anywhere between 1,000 to 1,500 when you let off the pedal at speeds < 20mph? I've had this 2020 for a few months now and it has been doing this since I got it. It's very persistent (and annoying) while driving in a parking lot or residential neighborhood. I've seen a couple of other forms discuss it but never any reasoning or fixes. Through testing I've found the following:

• When the truck is holding this weird throttle without my foot being on the pedal, it will hold it until I break through it and it "lets go" around 8mph. From what I can tell, it will just hold the rpm at say, 1,200, for as long as I let it.
• This doesn't happen when in manual shifting mode
• Doesn't happen with exhaust brake on either.
• Yes, truck is a "clean air breather". However, this issue was present before anything was changed.

Hopefully this makes sense and someone has found what causes it and a fix.

Is it tuned?

When I deleted my 2008 one of the reasons for the tune was to stop the DPF regeneration. The trucks nowadays use DEF fluid to trap the particulates, but the high idle could be doing the same thing as it did back then, increasing the temperature to generate less soot, less soot means less DEF management. If tuned, find out if the new tune accounted for the lack of need to do this.

Yeah, it is tuned but that's not what's causing it. I've been noticing this before the delete took place.

Little more insight:
As I went to get lunch an hour ago, in 3rd gear, in the parking lot, I let of the throttle and truck held 1100 rpm until I either used the brakes enough to slow down through that throttle hold OR I could tap button to turn the exhaust brake on and, like the flip of the switch, the engine let go of the 1100 rpm and returned to idle.

That has to be something computer related but a part of the computer that engine/trans tunes don't mess with.

That's what I'm saying, it would have always done it to reduce soot. Higher RPMs increases temperature, increased temperatures reduce soot. Reduced soot means DEF fluid lasts longer. My guess is thermal management of some sort, if not for soot, then for some other reason.

Mine did the same. 2020 Powerstroke. It didn't happen often enough to cause me to try to address it. I believe either tapping the brake or gas would stop it.

My 2025 does this. My 2017 did not. So you're not alone.

Yesterday said:

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My 2025 does this. My 2017 did not. So you're not alone.

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I had a 2012 years ago that didn't do it either.

Coming back from the gym this morning, I was thinking about high idle switches (which I'll look this evening to see if anything has been altered where you'd normally tie in a high idle switch), it almost is like the truck has a setting activated that allows for a higher idle rpm at low speed to where you'd still be able to creep along like you normally would unloaded at normal idle rpm, but loaded down with a trailer.

I don't know...Very odd.

Typically need the parking brake set for OEM high idle mods to function I believe.

I'm having a decent convo with someone on the Ford Temor forms if you wanted to follow it. He seems to think its something to do with the Torque Converter.

https://www.fordtremor.com/threads/phantom-throttle.22596/#post-505047

I am thinking this is a function of trying to be in a higher rpm range between gears to optimize towing/torque rather than temporarily dropping to low rmp immediately after a change in gear and then ramping back up through the gear until shifting to the next gear.

BMW has this feature on M Series manual transmission cars. You can shift gears, but the engine remains at a higher rpm with no throttle input during the shift so there is zero lag in acceleration/power coming into the next gear. I drove one once and it was awesome. I am not sure how the converter handles this without damage but it works great for a racing type vehicle. I could see the benefits of higher rpm during shifting for a towing vehicle as well.

It sounds similar to most tow/haul or sport mode functions as well.