How do I cancel a Remote Vehicle Start?
To cancel a remote start, aim the RKE transmitter at the vehicle and press and hold the remote start button until the parking lamps turn off. You can also cancel by turning on the hazard warning flashers, or by turning the ignition switch out of LOCK/OFF position and then back to LOCK/OFF. (Page 11)
From the official Chevrolet 2010 Impala manual, page 11
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