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.
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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G3500, VAN PASSENGER EXTENDED, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 531 (THEFT DETERRENT SYSTEM)
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 F
Section 531 (Theft Deterrent System)
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 FSECTION Section 531 (Theft Deterrent System)
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
- Schematic Wiring Diagrams
- Component Locator
- Diagnostic Information and Procedures
- Diagnostic Starting Point - Theft Deterrent
- Diagnostic System Check - Theft Deterrent
- Scan Tool Output Controls
- Scan Tool Data List
- Scan Tool Data Definitions
- Diagnostic Trouble Code (DTC) List
- DTC B2960: Security System Sensor Data Incorrect but Valid
- DTC B3031: Security System Controller In Learn Mode
- DTC B3055: No Transponder Modulation or No Transponder
- DTC P1626: Theft Deterrent Fuel Enable Signal Lost
- DTC P1629: ECM Has Not Received The Fuel Enable Password
- DTC P1630: Theft Deterrent Learn Mode Active
- DTC P1631: Theft Deterrent Fuel Enable Signal Not Correct
- Symptoms - Theft Deterrent
- Content Theft Deterrent (CTD) Alarm Mode Inoperative
- Content Theft Deterrent (CTD) Does Not Disarm with Key Lock
- Horn Inoperative in Content Theft Deterrent (CTD) Alarm Mode
- Lights Inoperative in Content Theft Deterrent (CTD) Alarm Mode
- Security Indicator LED Inoperative
- Repair Instructions
- Description and Operation
- Theft Systems Description and Operation
- Content Theft Deterrent (CTD) Description and Operation
- Notes
- Arming the CTD System
- Locking The Vehicle Without Arming The CTD System
- Disarming an armed system/silencing an alarm
- CTD Circuit Description
- Remote Control Door Lock Receiver (RCDLR)
- Door Jamb Switches
- Body Control Module (BCM)
- Front Door Lock Cylinder Switches
- Liftgate Key Cylinder Unlock Switch
- Lift Glass Ajar Switches
- Power Door Lock Switches
- Important
- Inputs
- Outputs
- Vehicle Theft Deterrent (VTD) Description and Operation
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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.