GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-13690468) - 2021 - CRC - 2/18/20
290 Driving and Operating
Measurement Height Example 1500 (mm)
H1 1000
H2 1050
H2-H1 50
(H2-H1)/2 25
H2- [(H2-H1)/2] 1025
Towing with the Four Corner Air Suspension
System
1. Adjust the vehicle air suspension to
"Normal Ground Clearance Height."
2. Position the truck so that the trailer is
ready to connect (Keep trailer detached).
3. Enable air suspension ‘Service Mode’ in
the center infotainment screen under
Settings/Vehicle/Suspension.
4. Measure the height of the top of the
front wheel opening at the fender to the
ground (H1).
5. Attach the vehicle to the trailer, do not
attach weight distribution bars at
this time.
6. Measure the height of the top of the
front wheel opening on the fender to
the ground (H2).
7. Install and adjust the tension in the
weight distributing bars per the
manufacturers’ recommendations so
thatthe height of the front fender is
approximately H2- [(H2-H1)/3] (1/3
between the two measured ride heights,
below the secondary ride height {H2}).
8. Disable air suspension air suspension
"Service Mode."
9. Air suspension will automatically adjust
ride height following step 8.
10. Visually inspect the trailer and
weight-distributing hitch to ensure that
the manufacturers’ recommendations
have been met.
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