Pontiac G3 2010 Owner's Manual page 128

Shifting out of P (Park) or N (Neutral) with
the engine running at high speed may damage the
transmission. The repairs would not be covered by
the vehicle warranty. Be sure the engine is not
running at high speed when shifting the vehicle.
D4 (Automatic Overdrive) : This position is for normal
driving.
When operating the vehicle in severe cold conditions,
the transmission may be prevented from shifting into
D4 gear until the transmission fluid has warmed up to
it's operational temperature.
If the vehicle seems to start up rather
slowly or not shift gears when you go faster, and
you continue to drive the vehicle that way, you
could damage the transmission. Have the vehicle
serviced right away. You can drive in 2 (Second)
when you are driving less than 35 mph (55 km/h)
and D4 (Automatic Overdrive) for higher speeds
until then.
2 (Second) : This position gives you more power but
lower fuel economy. You can use 2 (Second) on hills.
It can help control vehicle speed as you go down steep
mountain roads, while using the brakes off and on.
3-24
Do not drive in 2 (Second) at speeds over
65 mph (105 km/h), or you can damage the
transmission. Use D4 (Automatic Overdrive) as
much as possible. Do not shift into 2 (Second)
unless you are going slower than 65 mph (105 km/h)
or you can damage the engine.
1 (First) : This position gives you even more power but
lower fuel economy than 2 (Second). You can use it on
very steep hills, or in deep snow or mud. If the shift
lever is put in 1 (First), the transmission will not shift into
first gear until the vehicle is going slowly enough.
Spinning the tires or holding the vehicle in
one place on a hill using only the accelerator pedal
may damage the transmission. The repair will not be
covered by the vehicle warranty. If you are stuck, do
not spin the tires. When stopping on a hill, use the
brakes to hold the vehicle in place.
If there is a malfunction with the automatic transmission,
the malfunction indicator lamp (MIL) or the HOLD
indicator light will turn on or flash. See Malfunction
Indicator Lamp on page 4 29.
Have the vehicle fixed as soon as possible.