Delayed Locking
When this feature is enabled and the doors are locked with the power lock switch on the instrument panel or front door panels, three chimes sound to signal that the delayed locking feature is in use. All doors lock five seconds after the last door is closed.
When the delayed locking feature is in use, pressing 
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instrument panel or front door panels, or the RKE transmitter will override the
feature and lock all doors immediately.
This feature can be programmed by using the Driver Information Center (DIC). See “Delayed Door Lock” in Vehicle Personalization. The delayed locking feature is only available if “Unlocked Door Anti-Lockout” is disabled.
See also:
Reporting Safety Defects to the United States Government
If you believe that your vehicle has a defect which could cause a crash or
could cause injury or death, you should immediately inform the National Highway
Traffic Safety Administration (NHTSA) in ad ...
Transmission Messages
DIFFERENTIAL HOT, REDUCE
SPEED (CTS-V ONLY)
This message displays and a
chime sounds if the differential
fluid temperature exceeds 150°C
(300°F). Driving aggressively or
at high speeds can ...
Engine Speed Limiter
This feature prevents the engine
speed from reaching an unsafe
level. If the level is too high, the
throttle closes or limits the fuel
supply until the engine speed
returns to a safe level. ...