Chevrolet 2007 Cobalt Owner's Manual page 116

You have to fully apply your regular brakes first
and then press the shift lever button before
you can shift from PARK (P) when the ignition key
is in RUN. If you cannot shift out of PARK (P),
ease pressure on the shift lever and push the shift
lever all the way into PARK (P) as you maintain
brake application. Then press the shift lever button
and then move the shift lever into another gear.
See Shifting Out of Park (P) (Automatic Transaxle)
on page 123.
REVERSE (R): Use this gear to back up.
Notice: Shifting to REVERSE (R) while your
vehicle is moving forward could damage the
transaxle. The repairs would not be covered by
your warranty. Shift to REVERSE (R) only after
your vehicle is stopped.
To rock your vehicle back and forth to get out of
snow, ice, or sand without damaging your
transaxle, see If Your Vehicle is Stuck in Sand,
Mud, Ice, or Snow on page 252.
116
NEUTRAL (N): In this position, your engine does
not connect with the wheels. To restart when
you are already moving, use NEUTRAL (N) only.
Also, use NEUTRAL (N) when your vehicle is
being towed.
CAUTION:
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Shifting into a drive gear while your
engine is running at high speed is
dangerous. Unless your foot is firmly on
the brake pedal, your vehicle could move
very rapidly. You could lose control and
hit people or objects. Do not shift into a
drive gear while your engine is running at
high speed.