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 you
suspect a small leak, 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/retailer service department and have it
repaired before driving the vehicle further.
Notice: Use of the incorrect automatic transmission
fluid may damage your vehicle, and the damages
may not be covered by your warranty. Always use
the automatic transmission fluid listed in
Recommended Fluids and Lubricants on page 6-12.
Change the fluid and filter at the intervals listed in the
Maintenance Schedule. See Scheduled Maintenance
on page 6-4. Be sure to use the transmission fluid listed
in Recommended Fluids and Lubricants on page 6-12.
How to Check Automatic
Transmission Fluid
Notice: Too much or too little fluid can damage
your 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 you
check your transmission fluid.
Before checking the fluid level, prepare your vehicle as
follows:
1. Start the engine and park your vehicle on a level
surface. Keep the engine running.
2. Apply the parking brake and place the shift lever in
PARK (P).
3. With your foot on the brake pedal, move the shift
lever through each gear range, pausing for about
three seconds in each range. Then, move the shift
lever back to PARK (P).
4. Allow the engine to idle (500 – 800 rpm) for at least
one minute. Slowly release the brake pedal.
5. Keep the engine running and press the Trip/Fuel
button or trip odometer reset stem until TRANS
TEMP (Transmission Temperature) displays on the
Driver Information Center (DIC).
5-20
Summary of Contents for 2008 Yukon XL Denali
Page 98: ...NOTES 1 94...
Page 162: ...NOTES 2 64...
Page 165: ...NOTES 3 3...
Page 166: ...Instrument Panel Overview United States version shown Canada Similar 3 4...
Page 282: ...NOTES 3 120...
Page 338: ...NOTES 4 56...
Page 467: ...Engine Drive Belt Routing 6 15...
Page 488: ...NOTES 7 18...