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 1495 (CELLULAR SYSTEM, ENTERTAINMENT SYSTEM, AND NAVIGATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESONSTAR SYMPTOM DIAGNOSISCIRCUIT/SYSTEM VERIFICATION
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Circuit/System Verification
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Verification
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IMPORTANT:
- To successfully diagnose and repair the OnStar® system it is necessary to comprehend its operation. Technicians should read and understand the OnStar Description and Operation before attempting to repair an OnStar® system. This symptom below will enable the user to verify the customer complaint and narrow it to its source. If there is a concern with voice recognition or OnStar® steering wheel control function, technicians should proceed directly to the applicable diagnostic in Symptoms - Cellular Communication .
- It is important to have the vehicle in an open outside area where a cellular call can be successfully placed and GPS data can be received from satellites.
- It is necessary to inform the OnStar® Call Center advisor that this call is for vehicle diagnostic purposes.
- Ignition ON, observe that the OnStar® status LED turns green.
- If the LED does not turn green, refer to OnStar Button LED Inoperative .
- Radio ON, set the volume to a comfortable level.
- Press the OnStar® Call Center button and observe that the OnStar LED blinks.
- If the OnStar® LED does not blink, refer to OnStar One or More Buttons Inoperative .
- Listen that the radio muted and the Connecting to OnStar message played through the audio system.
- If the radio did not mute or the Connecting to OnStar message did not play, refer to No (or Noisy) OnStar Audio .
- Wait approximately 10 seconds, then end the call by pressing the white dot button and observe the OnStar LED stops blinking.
- If the OnStar® LED continues blinking, refer to OnStar One or More Buttons Inoperative .
- Press the OnStar® Call Center button and ensure that a connection was made with OnStar®.
- If the Unable to Contact OnStar® was heard, refer to Unable to Contact OnStar Call Center .
- If the OnStar® Request Ended was heard, go to Diagnostic Aids.
- Ensure that OnStar® Call Center advisor can hear your voice clearly.
- If the advisor cannot hear you clearly, refer to OnStar Microphone Inoperative - Caller Cannot Be Heard .
- Ensure that OnStar® Call Center advisor received a data transfer from the vehicle.
- Ensure with the OnStar® Call Center advisor the vehicle has been configured.
- If the vehicle has not been configured, refer to Control Module References
- Verify with the OnStar® Call Center advisor that the vehicle identification number (VIN) which they have on record matches the actual VIN.
- Verify that your position with the OnStar® Call Center advisor is within a reasonable distance from the actual location of the vehicle.
- If not within a reasonable distance, refer to OnStar Global Positioning System (GPS) Data Not Current or Inaccurate .
- Verify with the OnStar® Call Center advisor that the GPS position is marked as Current.
- If not current, refer to OnStar Global Positioning System (GPS) Data Not Current or Inaccurate .
- Ensure that the customer concern is the inability of the OnStar® Call Center to perform remote functions.
- If the OnStar® Call Center is able to perform remote functions, go to Diagnostic Aids.
- Refer to OnStar Call Center Remote Function Requests Inoperative .
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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.