How To Check Automatic Transmission Fluid; Cold Check Procedure - Hummer H2 2009 Owner's Manual

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 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).
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 P (Park).
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).
5-24
6. Using the TRANS TEMP reading, determine and
perform the appropriate check procedure. If the
TRANS TEMP reading is not within the required
temperature ranges, allow the vehicle to cool,
or operate the vehicle until the appropriate
transmission fluid temperature is reached.

Cold Check Procedure

Use this procedure only as a reference to determine if
the transmission has enough fluid to be operated
safely until a hot check procedure can be made. The
hot check procedure is the most accurate method
to check the fluid level. Perform the hot check procedure
at the first opportunity. Use this cold check procedure
to check fluid level when the transmission temperature is
between 80°F and 90°F (27°C and 32°C).
See Engine Compartment Overview on page 5-14
for more information.
2. Flip the handle up, and then pull out the dipstick
and wipe it with a clean rag or paper towel.
1. Locate the transmission
dipstick at the
rear of the engine
compartment, on
the passenger side
of the vehicle.