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 2293 (CELLULAR SYSTEM, ENTERTAINMENT SYSTEM AND NAVIGATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESUNABLE TO CONTACT ONSTAR CALL CENTERCIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Circuit/System Testing
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Testing
WARNING: This page is about a different car, the 2010 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect both the GPS and cell coax cable connectors at the K73 telematics communication interface control module.
- Connect the EL-49903 to the K73 telematics communication interface control module, place the test antenna on the roof of the vehicle.
- Ignition ON, wait 5 minutes, and then contact the OnStar call center consultant by pressing the blue OnStar button. A call center consultant should answer the call.
- If the unit does not connect to the OnStar Call Center and the subscription is valid, use a scan tool to obtain and record the following information: Electronic Serial Number (ESN), Station Identifier (STID), GM 8-digit part number, Mobile Identification Number (MIN), Mobile Dialed Number (MDN), Transceiver ID (Trans ID) and call GM TAC.
- Request the consultant to verify the vehicle location to confirm the GPS system is functioning.
- If the OnStar GPS does not function, replace the K73 telematics communication interface module.
- Ignition OFF, perform the coax cable test on the coax cable, refer to Component Testing. The coax cable should pass the test.
- If the coax cable does not pass the test, replace the coax cable.
- If all circuits test normal, replace the T4 cellular phone and navigation antenna.
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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.