2016 Colorado with diesel engine:
Nephew'* truck set a code, P20BE-00, also set the message on his instrument cluster that the truck will go into limp mode soon.
I have an Xtool D7 which is how I read the code, and I cleared the code.
Issue is that the IC display still says the truck will go into limp mode soon.
I would think that clearing the DTS code would erase this message but it remains.Nephew looking at taking the truck to a dealer, hope to avoid this.

I would think that the D7 would have the ability to erase this message but haven't been able to determine how.
I am definitely not a professional mechanic but I have done a lot of mechanical work on my various vehicles over the past 55 years. Bought the D7 hoping it would eventually pay for itself.- still think it will!.

Does anyone know the secret to erasing the IC message?
Any thoughts or information on this will be appreciated.

I see some references to this commonly happening when the weather gets cold. I've found several references to 2016 and 2017 Colorado Duramaxes that have the same issue, and several were fixed by replacing GM part number 84749035 . A different one fixed it by adding tape heaters to the DEF tank and line. I can't say this is guaranteed to fix yours, but might start you in the right direction.

Your luck may vary.

Thanks for the information CathedralCub, I take it the new pipe may stop the code from setting.
I still am trying to delete the dashboard IC (instrument cluster) message.
How is this generated and from which system?
I am trying to figure out why erasing the code does not seem to affect this message in the IC.
As I say, I am not a professional mechanic and haven't had a lot of scanner training.
BTW glad you're from earth.

That'* where my research gets a little more fuzzy. Some anecdotes say that the dealership initiates a full system test and their vehicles came back with no more message. One other said that they let the countdown run out then the message disappeared. I can't say I'm sure. I haven't run into this myself.

. . . and yeah. being from Earth has really given me an edge on this site. That, and Martian cars have all rusted into oblivion, so no fun there any more.

You may be required to use dealer software to clear/reset DPF/SCR faults in the system. This isn't per manufacturer, this is an EPA regulation in which the companies must abide by.

Thanks for the input Mike. Blasted government people just have to show they can do things!
So what you're saying is that the vehicle will go into limp mode even if an owner replaces the faulty part and erases the code?
Sounds like something is rotten in Detroit and DC.
Maybe I should contact Xtool and see what they have to say.

Do that. The tool may not clear it. If it is done with the factory tool or equivalent it will clear and the light will go out.

On Mack and Volvo trucks, once a unit goes into derate, it typically takes dealer software to do what'* called 'exit inducement' mode.
Now, sometimes, lets say for example, the DEF doser develops an open circuit, should you get this part replaced before it goes into derate, it is possible sometimes that the system will clear itself out and proceed with its own regen'*. But once it goes into derate, good luck. I've seen trucks towed in because the ACM fuse was either blown, or the positive lead for it that goes to the battery becomes loose. (Aftertreatment Control Module) This causes the ACM to lose power and no longer communicates on the CAN network, which also provides power to the NOX and PM sensors which are also on the CAN network. Then the other modules(ECU, VECU, TELEMATICS) all start bitching because they lost comm with those other ones.

Again, all because this is how the government wants diesel trucks to work.
Remember the guy in New Jersey that tried selling a 'deleted' pickup truck on Facebook? The state stepped in and told him no, unless he brings it back to factory specs. At this point, he was not able to due to parts availability, so he ended up either scrapping it or demo'ing it.
All because of the tree huggers.

Unfortunately DIC messages of that sort must be cleared by performing a Reductant System Tamper Service Bay Test using a factory issued scan tool and software. Hope this helps!