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 1409 (CELLULAR SYSTEM, ENTERTAINMENT SYSTEM, AND NAVIGATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B2462CIRCUIT/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 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
- Turn ON the ignition. Disconnect the GPS coaxial cable from the GPS antenna. Verify there is 4-5.5 volts between the center conductor and the shield of the coaxial cable.
- If 4-5.5 volts are present, replace the GPS antenna.
- Turn the ignition OFF. Disconnect the GPS coaxial cable from the radio. Test the resistance of the GPS coaxial cable center conductor from end to end. Verify the resistance is less than 5 ohms.
- If the resistance greater than 5 ohms, replace the GPS coaxial cable.
- Test the resistance of the GPS coaxial cable between the center conductor and the outer conductor. Verify there is infinite resistance between both conductors.
- If there is less than infinite resistance between the inner conductor and the outer conductor of the GPS coaxial cable, replace the GPS coaxial cable. If the GPS coaxial cable tests normal, replace the radio.
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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.