Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Universal Theft Deterrent System
The Universal Theft Deterrent (UTD) anti-theft system is designed to deter vehicle theft by pulsing horns and/or exterior lights when unauthorized vehicle entry is detected. The UTD system is an internal function of Body Control Module (BCM), utilizing PASS-Key(R), serial data and various switch inputs. The Powertrain Control Module (PCM) controls fuel enable circuit. BCM must exchange a unique password with PCM to allow fuel enable. If BCM detects an illegal intrusion, BCM will disable cranking and PCM will not enable fuel delivery. The UTD system interacts with Remote Function Actuation (RFA). For more information on remote transmitter and RFA system, see REMOTE KEYLESS ENTRY SYSTEMS - CORVETTE article.
System components include door ajar switches, hatch ajar switch, door lock cylinder switches, power lock switches, hood ajar switch (export only), key in ignition switch, BCM and relays.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.