GMC Yukon 2025 - Trailering App

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-17942154) - 2025
Driving and Operating 301
Warning (Continued)
brake apply lever. Also, check the
trailer brake lamps and other lamps are
functioning correctly.
•
If the trailer brakes are not operating
properly at any time, or if a DIC message
indicates problems with the trailer
connections or trailer brakes, carefully
pull the vehicle over to the side of the
road when traffic conditions allow.
Trailer Tires
Sp
ecial Trailer (ST) tires differ from vehicle
tires. ST tires are designed with stiff sidewalls
to help prevent sway and to support heavy
loads. These features can make it difficult to
determine if the trailer tire pressures are low
only based on avisual inspection.
Always check all trailer tire pressures before
each trip when the tires are cool. Low trailer tire
pressure is aleading cause of trailer tire blow-
outs.
If the vehicle is equipped with atrailer tire
pressure monitoring system, see the trailer tire
pressure monitoring system description and
the Trailering App 3301.
Trailer tires deteriorate over time. The trailer
ti
re sidewall will show the week and year
the tire was manufactured. Many trailer
tire manufacturers recommend replacing tires
more than six years old.
Overloading is another leading cause of trailer
tire blow-outs. Never load your trailer with
more weight than the tires are designed to
support. The load rating is located on the trailer
tire sidewall.
Always know the maximum speed rating for
the trailer tires before driving. This may be
significantly lower than the vehicle tire speed
rating. The speed rating may be on the trailer
tire sidewall. If the speed rating is not shown,
the default trailer tire speed rating is 105 km/h
(65 mph).
Trailering App
Trailer Light App
If equipped, the Trailering App is on the
infotainment home screen.
Status View
The Status view shows:
•
Lights
•
Checklists
•
Br
akes (If equipped)
Each section shows high-level status
information for the feature. Selecting a section
opens up anew screen with additional
information and/or options.
Light Test
Select Start to cycle the trailer lamps on and
off to determine if they are working. The test
follows this sequence:
1. The running lights turn on first and remain
on throughout the sequence.
2. The brake lights turn on for about
two seconds.
3. The left turn signal light flashes three times.
4. The right turn signal light flashes
three times.
5. The reverse lights turn on for about
two seconds.
6. Steps 2–5 repeat for about one minute and
45 seconds, or until the test deactivates.
Select Stop to end the test.
The sequence also deactivates when any of the
following occur:
•
The vehicle is turned off.