Chevrolet 2009 Impala Owner's Manual page 277

Then, without shutting off the engine, follow these steps:
1. Pull out the dipstick and wipe it with a clean rag or
paper towel.
See Engine Compartment Overview on page 5-14
for more information on location.
2. Push it back in all the way, wait three seconds and
then pull it back out again.
The transmission fluid
dipstick handle is the black
loop with this symbol on
it. It is located near
the rear of the engine
compartment.
V6 Engines
3. Check both sides of the dipstick, and read the
lower level. The fluid level must be in the
cross-hatched area.
4. If the fluid level is in the acceptable range, push the
dipstick back in all the way.
5.3L V8 Engine
5-25