GMC Sierra Denali 1500 2023 Owner's Manual page 356

Caution
If the battery is disconnected with the
ignition on or the vehicle in Retained
Accessory Power (RAP), the OnStar
back-up battery will be permanently
discharged and will need to be replaced.
1. Make sure the lamps, features, and
accessories are turned off.
2. Turn the ignition off and remove the
key, if equipped.
For vehicles equipped with the Stop/Start
system:
1. Loosen and remove the negative battery
cable nut (1) at the battery sensor
connection.
2. Remove the negative battery cable (2)
from the battery sensor stud.
3. Cover the negative battery cable
terminal, battery sensor stud, and
negative battery post with a
non-conductive material to prevent any
contact with the negative battery cable.
For vehicles not equipped with the Stop/
Start system:
1. Loosen the negative battery cable nut (1).
2. Remove the negative battery cable
clamp (2) from the negative battery post.
Vehicle Care
3. Cover the negative battery cable clamp,
and negative battery post with a
non-conductive material to prevent any
contact with the negative battery cable.
Negative Battery Cable Reconnection
Caution
When reconnecting the battery:
Use the original nut from the vehicle
to secure the negative battery cable.
Do not use a different nut. If you
need a replacement nut, see your
dealer.
Tighten the nut with a hand tool. Do
not use an impact wrench or power
tools to tighten the nut.
The vehicle could be damaged if these
guidelines are not followed.
Caution
Do not use paints, lubricants, or corrosion
inhibitors on the nut that secures the
negative battery cable to the vehicle. This
could damage the vehicle.
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