Starting And Operating; New Vehicle Break-In; Ignition Positions (Key Access) - GMC Sierra 2500 HD 2023 Owner's Manual

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Certification/Tire Label under Vehicle
Load Limits 0 215. If weight ratings are
exceeded, move or remove items to
bring all weights below the ratings.
See your dealer for more information
on curb weights, cargo weights, Cargo
Weight Rating, and the correct center of
gravity zone.

Starting and Operating

New Vehicle Break-In

Caution
The vehicle does not need an elaborate
break-in. But it will perform better in the
long run if you follow these guidelines:
Do not drive at any one constant
speed, fast or slow, for the first
800 km (500 mi). Do not make
full-throttle starts. Avoid downshifting
to brake or slow the vehicle.
Avoid making hard stops for the first
300 km (200 mi) or so. During this
time the new brake linings are not yet
broken in. Hard stops with new linings
Caution (Continued)
can mean premature wear and earlier
replacement. Follow this breaking-in
guideline every time you get new
brake linings.
Do not tow a trailer during break-in.
See Trailer Towing 0 272 for the trailer
towing capabilities of the vehicle and
more information.
Following break-in, engine speed and load
can be gradually increased.
On new vehicles, the various mechanical and
electrical systems experience a break-in
period during the first 6,400 km
(4,000 miles) of routine driving. As the
vehicle is driven, the mechanical systems
adjust to provide optimal fuel economy and
transmission shift performance.
Electrical systems will adapt and calibrate
during the break-in period. A one-time
occurrence of clicks and similar vehicle
noises is normal during this process.
Normal driving charges the vehicle s battery
to achieve the best operation of the vehicle,
including fuel economy.
(Continued)
Driving and Operating

Ignition Positions (Key Access)

0. Stopping the Engine/LOCK/OFF
1. ACC/ACCESSORY
2. ON/RUN
3. START
The ignition switch has four positions.
To shift out of P (Park), the ignition must be
ON/RUN and the brake pedal must be
applied.
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