Chevrolet 2010 Impala Owner's Manual page 191

This message displays when the driver door is not
closed properly. Make sure that the door is closed
completely.
This message displays when the engine coolant
becomes hotter than the normal operating temperature.
To avoid added strain on a hot engine, the air
conditioning compressor is automatically turned off.
When the coolant temperature returns to normal,
the A/C operation automatically resumes. You can
continue to drive your vehicle. If this message continues
to appear, have the system repaired by your dealer
as soon as possible to avoid compressor damage.
This message displays when the engine coolant
temperature is too hot. Stop and allow the vehicle to
idle until it cools down.
This message displays along with a continuous chime
when the engine has overheated. Stop and turn the
engine off immediately to avoid severe engine damage.
See
This message displays when the vehicle's engine
power is reduced. Reduced engine power can affect
the vehicle's ability to accelerate. If this message is on,
but there is no reduction in performance, proceed to
your destination. The performance may be reduced
the next time the vehicle is driven. The vehicle may be
driven at a reduced speed while this message is on,
but acceleration and speed may be reduced. Anytime
this message stays on, the vehicle should be taken to
your dealer for service as soon as possible.
This message displays while viewing the odometer or
trip odometers if there is a problem with the instrument
panel cluster. See your dealer for service.
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