Chevrolet 2010 Impala Owner's Manual page 114

The engine will shut off automatically after 10 minutes,
unless a time extension has been done or the vehicle's
key is inserted into the ignition switch and turned to
ON/RUN.
To manually shut off a remote start, do any of the
following.
•
Aim the RKE transmitter at the vehicle and press
and release the remote start button.
•
Turn on the hazard warning flashers.
•
Turn the ignition switch out of LOCK/OFF position
and then back to LOCK/OFF.
After the engine has been started two times, or one
time with a time extension, the vehicle's ignition must
be turned to ON/RUN using the key before the remote
start procedure can be used again. See Ignition
Positions on page 3-20 for information regarding the
ignition positions on your vehicle.
3-8
The remote vehicle start feature will not operate if any
of the follow occur:
•
The remote start system is disabled through the DIC.
•
The vehicle's key is in the ignition.
•
The vehicle's hood is open.
•
The hazard warning flashers are on.
•
The check engine light is on. See Malfunction
Indicator Lamp on page 4-31.
•
The engine coolant temperature is too high.
•
The oil pressure is low.
•
The content theft-deterrent alarm has been activated.
•
Two remote vehicle starts, or one start with a time
extension, have already been provided for that
ignition cycle.