Envoy 4WD V8-5.3L VIN P (2004)
Alarm System Transponder: Description and Operation
THE IGNITION KEY (TRANSPONDER)
The ignition key on vehicles equipped with the passkey III+ system is a typical locking ignition key with a transponder located in the plastic end 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. The VTD systems use the following types of ignition keys:
Master Keys
Master keys have a black plastic end are 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.
