GMC 2012 Terrain Owner's Manual page 223

When driving on hills:
Use a low gear and keep a firm
grip on the steering wheel.
Maintain a slow speed.
When possible, drive straight up
or down the hill.
Slow down when approaching
the top of the hill.
Use headlamps even during the
day to make the vehicle more
visible.
WARNING
Driving to the top of a hill at high
speed can cause an accident.
There could be a drop-off,
embankment, cliff, or even
another vehicle. You could
be seriously injured or killed.
As you near the top of a hill,
slow down and stay alert.
Never go downhill forward or
backward with the transmission
in N (Neutral). The brakes could
overheat and you could lose
control.
When driving down a hill, keep
the vehicle headed straight
down. Use a low gear because
the engine will work with the
brakes to slow the vehicle and
help keep the vehicle under
control.
WARNING
Heavy braking when going down
a hill can cause your brakes to
overheat and fade. This could
cause loss of control and you or
others could be injured or killed.
Apply the brakes lightly when
descending a hill and use a low
gear to keep vehicle speed under
control.
Driving and Operating
If the vehicle stalls on a hill:
1. Apply the brakes to stop the
vehicle, and then apply the
parking brake.
2. Shift into P (Park) and then
restart the engine.
If driving uphill when
the vehicle stalls, shift to
R (Reverse), release the
parking brake, and back
straight down.
Never try to turn the vehicle
around. If the hill is steep
enough to stall the vehicle,
it is steep enough to cause
it to roll over.
If you cannot make it up
the hill, back straight down
the hill.
Never back down a hill in
N (Neutral) using only the
brake.
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