Active Fuel Management; Automatic Transmission Operation - Pontiac 2008 Grand Prix Owner's Manual

Active Fuel Management™

Your vehicle's engine may be equipped with Active
Fuel Management™. This system allows the engine
to operate on either all or half of its cylinders,
depending on your driving conditions.
When less power is required, such as cruising at a
constant vehicle speed, the system will operate in
the half cylinder mode, allowing your vehicle to
achieve better fuel economy. When greater power
demands are required, such as accelerating from
a stop, passing, or merging onto a freeway, the
system will maintain full-cylinder operation.
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Automatic Transmission Operation

The shift lever for the automatic transmission is
located on the console between the seats.
Maximum engine speed is limited when the vehicle
is in PARK (P) or NEUTRAL (N) to protect driveline
components from improper operation.
3800 V6 Engine
PARK (P): This position locks the front wheels.
It is the best position to use when the engine is
started because the vehicle cannot move easily.
There are several
different positions
for the shift lever.