GMC Duramax Diesel 2018, Owner'S Manual Supplement

Page: 6 / 137

Chevrolet/GMC Duramax Diesel Supplement (GMNA-Localizing-U.S./Canada-
11354421) - 2018 - CRC - 5/9/17
In Brief 5
In Brief
Initial Drive Information
Transmission . . . . . . . . . . . . . . . . . . . . 5
Performance and Maintenance
Engine Oil Life System . . . . . . . . . . 6
Diesel Particulate Filter . . . . . . . . . . 6
Diesel Exhaust Fluid . . . . . . . . . . . . 7
Initial Drive
Information
Transmission
Cold Operation (8-Cylinder Pickup
Models Only)
When temperatures are very cold,
the transmission will prevent certain
operations to protect against
damage. The information below
shows shift range availability based
on transmission oil temperature:
.
All shift ranges available at
− 25 °C ( − 13 °F) or above.
.
2 (Second) and 3 (Third) shift
ranges only at
− 35 °C ( − 31 °F) to
− 25 °C ( − 13 °F).
.
2 (Second) shift range only at
− 35 °C ( − 31 °F) or lower.
Torque converter clutch operation
will also be prevented when air or
transmission oil temperatures are
below certain levels.
For areas where ambient
temperatures are below
− 40 °C
( − 40 °F), use synthetic transmission
fluid approved to Allison
Transmission specification TES-295.
See
Recommended Fluids and
Lubricants 0 125 and Automatic
Transmission Fluid 0 94 .
Adaptive Shift Controls
(8-Cylinder Pickup Models Only)
The shift quality of a new vehicle
may not be ideal because the
Adaptive Shift Control process may
not have determined the best
settings for a particular shift or
condition. Shift quality will improve
with continued driving.
Low Traction Mode (All Models)
Low Traction Mode aids in vehicle
acceleration on slippery road
surfaces such as ice or snow. By
selecting 2 (Second) using Range
Selection Mode while at a stop, the
transmission will limit torque to the
drive wheels to prevent slippage.