GMC 2011 Sierra Denali, Owner'S Manual

Page: 355 / 492

Vehicle Care 10-11
Automatic Transmission
Fluid
When to Check and Change
Automatic Transmission Fluid
It is usually not necessary to
check the transmission fluid level.
The only reason for fluid loss is a
transmission leak or overheating the
transmission. If a small leak is
suspected, then use the following
checking procedures to check the
fluid level. However, if there is a
large leak, then it may be necessary
to have the vehicle towed to a
dealer service department and have
it repaired before driving the vehicle
further.
Notice: Use of the incorrect
automatic transmission fluid may
damage the vehicle, and the
damages may not be covered by
the vehicle's warranty. Always
use the automatic transmission
fluid listed in
Recommended
Fluids and Lubricants on
page 11
‑ 7 .
Change the fluid and filter at the
intervals listed in the Maintenance
Schedule. See
Scheduled
Maintenance on page 11 ‑ 2 .
Be sure to use the transmission fluid
listed in
Recommended Fluids and
Lubricants on page 11 ‑ 7 .
How to Check Automatic
Transmission Fluid
Notice: Too much or too little
fluid can damage the
transmission. Too much can
mean that some of the fluid could
come out and fall on hot engine
parts or exhaust system parts,
starting a fire. Too little fluid
could cause the transmission to
overheat. Be sure to get an
accurate reading if checking the
transmission fluid.
Before checking the fluid level,
prepare the vehicle as follows:
1. Start the engine and park the
vehicle on a level surface.
Keep the engine running.
2. Apply the parking brake and
place the shift lever in P (Park).