GMC Sierra
Sierra is a 4-door, up to 6-passenger full size pickup.
See also:
Roadside Assistance Program
U.S.: 1-888-881-3302
TTY Users (U.S.): 1-888-889-2438
Canada: 1-800-268-6800
Mexico: 01-800-466-0801
As the owner of a new GMC, you are automatically enrolled in the Roadside Assistance program.
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Lumbar Adjustment
Power Lumbar
Eight-Way Power Seat Shown, Four-Way Similar
A. Lumbar Switch
If available, press and hold the front or rear of the switch (A) to increase
or decrease lumbar support. Release the s ...
Securing the Child within the Child Restraint
WARNING
A child can be seriously injured or killed in a crash if the child is not properly secured in the child restraint. Secure the child properly following the instructions that came with that chi ...