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 MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 556 (THEFT DETERRENT SYSTEM)
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Section 556 (Theft Deterrent System)
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Section 556 (Theft Deterrent System)
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
- Schematic and Routing 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 B2721
- DTC B2722
- DTC B2723
- DTC B2735
- DTC P1626
- DTC P1630
- DTC P1631
- Symptoms - Theft Deterrent
- Content Theft Deterrent (CTD) Alarm Mode Inoperative
- Content Theft Deterrent (CTD) Does Not Disarm with Key Lock (Without VE1)
- Content Theft Deterrent (CTD) Does Not Disarm with Key Lock (With VE1)
- Horn Inoperative in Content Theft Deterrent (CTD) Alarm Mode
- Lights Inoperative in Content Theft Deterrent (CTD) Alarm Mode
- Security Indicator Always On or Flashing
- Security Indicator 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)
- Body Control Module (BCM)
- Door Ajar Switches
- Ignition Lock Cylinder
- Drivers Door Key Switch
- Front Door Key Switches (W/VE1)
- Power Door Lock Switches
- Important
- Inputs
- Outputs
- Vehicle Theft Deterrent (VTD) Description and Operation
- Special Tools and Equipment
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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.