How to reset 03 cadillac cts anti thief system?

SOURCE: 03 cadillac cts timing belt change procedure

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SOURCE: T/C light comes on in the dash of my 03 Cadillac CTS

T/C would be traction control i would think

Robert

SOURCE: 2004 cts cadillac service security system; key

Has nothing to do with security system. You either have a bad shifter assembly, or a faulty lock cylinder in your ignition switch.

SOURCE: where is the thermostat on an 03 cadillac cts

no the thermostat is not always in the upper radiator hose

SOURCE: how do you bypass anti thief so my car will run.

there is no easy way. the problem is most likely the key tumbler failed and a code will indicate this. if it was easy to bypass the security it wouldnt be security.