Chevrolet 2011 Volt Owner's Manual page 372

Getting under a vehicle when it
is jacked up is dangerous. If the
vehicle slips off the jack, you
could be badly injured or killed.
Never get under a vehicle when
it is supported only by a jack.
Raising the vehicle with the
jack improperly positioned can
damage the vehicle or the vehicle
may fall and cause you or others
injury.
When using a jack to lift the vehicle,
follow the instructions that came
with the jack and be sure to use
the correct lifting points to avoid
damaging the vehicle.