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 MANUALSCHEVROLET2002CHEVY EXPRESS G3500, VAN PASSENGER EXTENDED, 8.1 GREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESBODY CONTROL MODULESPROGRAMMINGOFFBOARD PROGRAMMING
2002 Chevrolet Chevy Express G3500, Van Passenger Extended, 8.1 G
OFFBOARD Programming
2002 Chevrolet Chevy Express G3500, Van Passenger Extended, 8.1 GSECTION OFFBOARD Programming
- Obtain VIN of the vehicle for which the control module is being programmed.
- Select Service Programming with Techline terminal.
- Select Tech 2, Program ECU, and Off-Board Programming Adapter as the electronic control unit (ECU) location.
- Connect control module, Off-Board Programming Adapter, and Tech 2 as described on Techline terminal.
- Select Service Programming Request Information function. Tech 2 communicates with the control module and receives access code.
- Exit Service Programming Request Information.
- Disconnect Tech 2 from Off-Board Programming Adapter.
- Connect the Tech 2 to the Techline terminal.
- Turn ON the Tech 2.
- Enter the VIN of the vehicle that will be receiving the control module.
- Techline terminal will display the message, attaching to database.
- Identify what type of programming that you are performing.
- Select the appropriate calibration file.
- Ensure all connections are secure.
- Techline terminal displays a summary screen that summarizes your selections. After confirming choices, Techline terminal automatically loads the calibration files to the Tech 2.
- After download is complete, turn OFF the Tech 2.
- Disconnect Tech 2 from the Techline terminal
- Connect Tech 2 to Off-Board Programming Adapter.
- Select Service Programming.NOTE: DO NOT turn the Off-Board Programming Adapter OFF if the procedure is interrupted or unsuccessful. Ensure the control module and the Off-Board Programming Adapter connections are secure and the Techline operating software is up to date. Attempt to reprogram the control module. If the control module cannot be programmed, replace the control module.
- Select Program with Tech 2.
- After the download is complete, exit Service Programming.
- Turn the Off-Board Programming Adapter OFF.
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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.