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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 633 (CELLULAR COMMUNICATION SYSTEM)
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Section 633 (Cellular Communication System)
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Section 633 (Cellular Communication System)
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Specification
- Schematic and Routing Diagrams
- Component Locator
- Diagnostic Information and Procedures
- Diagnostic Starting Point-Cellular Communication
- Diagnostic System Check-Cellular Communication
- Scan Tool Data List
- Scan Tool Data Definitions
- Diagnostic Trouble Code (DTC) List
- DTC B2455: Open In Cellular Microphone Low Reference Circuit, Or Short To Voltage In Cellular Microphone Signal Circuit
- DTC B2470: VCIM Does Not Detect The Presence Of The Cellular Antenna
- DTC B2476: Keypad Signal Circuit Voltage Low
- DTC B2482: A Button Is Depressed Or Stuck For More Than 15 Seconds
- DTC B2483 or B2484: VCIM Does Not Detect A Navigation Signal
- DTC U1500: VCIM Detects An Internal Communication Malfunction
- OnStar Symptom Diagnosis
- Symptoms-Cellular Communication
- Onstar One Or More Buttons Inoperative
- Unable to Contact OnStar Call Center
- Microphone Inoperative-Caller Cannot Be Heard
- Voice Recognition Inoperative
- OnStar Steering Wheel Control Functions Inoperative
- OnStar Button LED Inoperative
- No (or Noisy) OnStar Audio
- Global Positioning System (GPS) Data Not Current or Inaccurate
- Repair Instructions
- Description and Operation
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.