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 MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1781 (CELLULAR SYSTEMS, ENTERTAINMENT SYSTEMS & NAVIGATION SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B2470CIRCUIT/SYSTEM TESTING
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2
Circuit/System Testing
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Circuit/System Testing
WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the cellular antenna coax from the CIM module and the cellular antenna.
- Connect the EL-49903 to the CIM, place the test antenna on the roof of the vehicle. See Special Tools .
- Ignition ON, clear the DTCs and operate the vehicle within the conditions for running the DTC. Verify B2470 does not set
- if the DTC sets, replace the CIM.
- Ignition ON, test for less than 1 volt between the antenna coax center terminal and ground.
- If greater than the specified range, replace the antenna coax.
- Ignition ON, test for less than 1 volt between the antenna coax outer shield and ground.
- If greater than the specified range, replace the antenna coax.
- Test for infinite resistance between the antenna coax center terminal and ground.
- If less than the specified value, replace the antenna coax
- Test for infinite resistance between the antenna coax outer shield and ground.
- If less than the specified value, replace the antenna coax
- Test for less than 5 ohms at the cellular antenna coax center terminal from end to end.
- If greater than specified value, replace the cellular antenna coax cable.
- Test for less than 5 ohms at the cellular antenna coax outer shield from end to end.
- If greater than specified value, replace the cellular antenna coax cable.
- Test for infinite resistance between the antenna coax center terminal and the outer shield.
- If less than specified value, replace the cellular antenna coax cable.
- If coax cable tests normal, replace the cellular antenna.
NOTE:
The vehicle may be equipped with sectioned coax. Test each section and replace only the faulty section, not the entire length of coax.
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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.