GMC 2016 Yukon XL Denali Owner's Manual page 333

332 Vehicle Care
5. Shift the transmission into D
(Drive). Turn the engine off.
Then shift the transmission into
P (Park).
6. Wait for at least 10 seconds,
then restart the engine.
7. Shift the transmission to D
(Drive), then turn the engine off
again.
Caution
Failure to disconnect the negative
battery cable or to have it contact
the terminals can cause damage
to the vehicle.
8. Disconnect the negative
battery cable at the battery and
secure the nut and bolt. Cover
the negative battery post with a
non-conductive material to
prevent any contact with the
negative battery terminal.
9. Shift the transmission to
P (Park).
Caution
If the steering column is locked,
vehicle damage may occur.
10. Move the steering wheel to
make sure the steering column
is unlocked.
11. With a foot on the brake pedal,
release the parking brake.
12. Keep the ignition key in the
towed vehicle in ACC/
ACCESSORY to prevent the
steering column from locking.
If equipped with Keyless
Access, keep the RKE
transmitter outside of the
vehicle, and manually lock the
doors. Access the vehicle as if
it has a dead RKE transmitter
battery, by using the key in the
door lock.
Disconnecting the Towed Vehicle
Before disconnecting the towed
vehicle:
1. Park on a level surface.
2. Set the parking brake, then
shift the transmission to
P (Park).
3. Connect the battery.
4. Apply the brake pedal.
5. Turn the ignition to ON/RUN
with the engine off. Shift the
transfer case out of N (Neutral)
to 2 . See Shifting out of
N (Neutral) under Four-Wheel
Drive 0 213. See your dealer if
the transfer case cannot be
shifted out of N (Neutral).
6. Check that the vehicle is in 2
by starting the engine and
shifting the transmission to
R (Reverse) and then to D
(Drive). There should be
movement of the vehicle while
shifting.
7. Shift the transmission to
P (Park) and turn off the
ignition.
8. Disconnect the vehicle from the
tow vehicle.
9. Release the parking brake.
10. Reset any lost presets.