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 901 (DATA COMMUNICATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICECIRCUIT/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 does not describe the selected car, but rather 6 other vehicles, including the 2007 GMC Savana Special, 2007 GMC Savana Camper Special, 2007 GMC Savana, 2007 Chevrolet RV Cutaway, and 2007 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
- Test for less than 1.0 ohm of resistance between the DLC ground circuit terminal 5 and ground.
- If greater than 1.0 ohm, test the ground circuit for open/high resistance.
- Ignition OFF, disconnect the harness connector (splice pack comb) at SP 205. Install a 3-amp fused jumper wire between SP 205 pin A and pin M, harness side.
- Ignition ON, with a scan tool, attempt to communicate with the body control module (BCM). Communication should be available.
- If no communication, test the serial data circuit for a short to ground, a short to voltage or an open/high resistance between the BCM and the DLC. If the circuit tests normal, replace the BCM.
- Install another 3-amp fused jumper wire to SP 205 pin A, harness side.
- With BCM communications established, use the other end of the jumper wire to connect all other pins, harness side, one at a time and verify that communication remains available to the BCM.IMPORTANT: Allow communications for 5 seconds after connecting a module with the jumper to determine if communication is interrupted or not.
- If communication is interrupted after connecting an individual module at SP 205, test the serial data circuit between SP 205 and the last module connected for a short to ground and short to voltage. If the circuit tests normal, replace the module that caused no communication.
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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.