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I had this pop up on me today. Truck had sat idling with the AC on for about 10 min in 100 degree heat. Got in and drove about 100 yards and it came on and went away. Truck had no power, go figure, and would not rev above 1500 rpm. Got home and shut it down for about 30 min. Got back in to go to the dealer and it ran fine. Dealer will take a look Tuesday, but hoping somebody else had this issue and resolved it already.
You can read it if you highlight the block. Don't know what the purpose of making it hard was, but oh well. As to the question, you are in reduced power due to something that will cause emissions to exceed standards or something is happening that will damage the powertrain. It could be one of a thousand things. It will throw a code and the dealer should be able to sort it out. Also, as you're not being charged by the word, any time you have a technical question, it is always beneficial to include details on your vehicle. Things like what year and what engine make a difference in getting help.
Sorry for the omission and the messed up font. No idea what made it that way. Truck is a new 2021 f250 6.7 with 1900 miles. I came from a 2017 6.7, with no issues ever. That’s why I’m a bit surprised.
only thing I can add, is the truck idled with the AC on for about 10 min in 100 degree heat after I pulled a trailer that was about 8k for maybe 30 min.
The problem isn't related to those two conditions. Those are very tame, routines for a diesel SD. Normally you would also get a check engine light when you have a limp mode. Again, it could be any number of things. Let the dealer sort it out.