CTS V8-5.7L VIN P (2004)
Alarm System Transponder: Description and Operation
THE IGNITION KEY (TRANSPONDER)
The ignition key for passkey III+ (PK3+) equipped vehicles is a typical looking ignition key with a transponder located in the plastic head of the key.
The transponder value is fixed and unable to be changed. The VTD system uses the ignition key transponder value to determine if a valid ignition key is
being used to start the vehicle. There are approximately three trillion possible transponder values. There are no visible electrical contacts. The keys may
be identified by the letters PK3+ stamped into the steel shank of the key. VTD systems use the following types of ignition keys:
Master Keys
Master keys have a black plastic head for full access operation of the vehicle. Master keys may perform the following functions:
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Start the vehicle.
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Lock/unlock all of the door locks.
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Lock/unlock all of the storage compartments.
Valet Keys
IMPORTANT: Valet keys are NOT standard equipment on all GM vehicle lines.
Valet keys have a gray plastic head and are for restricted operation of the vehicle. Valet keys may perform the following functions:
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Start the vehicle.
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Lock/unlock all of the door locks.