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GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada/Mexico-14632286) - 2021 - CRC - 11/19/20
392
Service and Maintenance
.
Visually inspect drive shafts for excessive
wear, lubricant leaks or damage including:
tube dents, cracks, constant velocity joint
or universal joint looseness, cracked or
missing boots, loose or missing boot
clamps, center bearing excessive
looseness, missing or loose fasteners.
.
Check restraint system components. See
.
.
Visually inspect fuel system for damage
or leaks.
.
Visually inspect exhaust system and
nearby heat shields for loose or damaged
parts.
.
Lubricate body components. See
.
.
Check starter switch. See
.
.
Check automatic transmission shift lock
control function. See
Transmission Shift Lock Control Function
Check
.
Check ignition transmission lock. See
Ignition Transmission Lock Check
.
Check parking brake and automatic
transmission park mechanism. See
Brake and P (Park) Mechanism Check
.
.
Check accelerator pedal for damage, high
effort, or binding. Replace if needed.
.
Visually inspect gas strut for signs of
wear, cracks, or other damage. Check the
hold open ability of the strut. If the hold
open is low, service the gas strut. See
.
.
Inspect sunroof track and seal,
if equipped. See
.
.
Verify spare tire key lock operation and
lubricate as needed. See
.
.
Visually inspect the spare tire to ensure
that it is tightly stowed under the vehicle.
Push, pull, and try to turn the tire. If the
spare tire moves, tighten as necessary.
See
.