I had a 2015 that never had this problem in 80,000 miles. I recently traded it in on a 2017. It currently has 1500 (that is not a typo 1500) miles and it had exactly the same symptoms that Bob described. The dealer also said that it needed a regen. I have a hard time believing that a truck with 1500 miles would require a regen. I live in North West Illinois and we had the extreme cold when this problem occurred as well.
Your truck will most likely regen on its own every 75-150 miles. If for some reason the regens do not complete you should see a message on the EVIC stating 80%, than 90% full and the message will say to drive at highway speeds to complete the regen. If the filter reaches 100% (due to not completing or some other issue) you will have to see the dealer for a forced regen.
Here's some info from your owners manual.
Diesel Particulate Filter (DPF) Messages
This engine meets all required diesel engine emissions
standards. To achieve these emissions standards, your
vehicle is equipped with a state-of-the-art engine and
exhaust system. These systems are seamlessly integrated
into your vehicle and managed by the Powertrain Control
Module (PCM). The PCM manages engine combustion
to allow the exhaust system’s catalyst to trap and
burn Particulate Matter (PM) pollutants, with no input or
interaction on your part.
Your vehicle has the ability to alert you to additional
maintenance required on your vehicle or engine. Refer to
the following messages that may be displayed on your
Electronic Vehicle Information Center (EVIC):
• Exhaust Filter XX% Full Safely Drive at Highway
Speeds to Remedy — This message will be displayed
in the Electronic Vehicle Information Center (EVIC) if
the exhaust particulate filter reaches 80% of its maximum
storage capacity. Under conditions of exclusive
short duration and low speed driving cycles, your
diesel engine and exhaust after-treatment system may
never reach the conditions required to cleanse the filter
to remove the trapped PM. If this occurs, the “Exhaust
Filter XX% Full Safely Drive at Highway Speeds to
Remedy” message will be displayed in the EVIC. If
this message is displayed, you will hear one chime to
assist in alerting you of this condition. By simply
driving your vehicle at highway speeds for up to 20
minutes, you can remedy the condition in the particulate
filter system and allow your diesel engine and
exhaust after-treatment system to cleanse the filter to
remove the trapped PM and restore the system to
normal operating condition.
• Exhaust System — Regeneration In Process Exhaust
Filter XX% Full — This message indicates that the
Diesel Particulate Filter (DPF) is self-cleaning. Maintain
your current driving condition until regeneration
is completed.
• Exhaust System — Regeneration Completed — This
message indicates that the Diesel Particulate Filter
(DPF) self-cleaning is completed. If this message is
displayed, you will hear one chime to assist in alerting
you of this condition.
• Exhaust Service Required — See Dealer Now — This
messages indicates regeneration has been disabled due
to a system malfunction. At this point the engine
Powertrain Control Module (PCM) will register a fault
code, the instrument panel will display a MIL light.
• Exhaust Filter Full — Power Reduced See Dealer —
This message indicates the PCM has derated the
engine to limit the likelihood of permanent damage to
the after-treatment system. If this condition is not
corrected and a dealer service is not performed, extensive
exhaust after-treatment damage can occur. To
correct this condition it will be necessary to have your
vehicle serviced by your local authorized dealer.
