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 MANUALSCHEVROLET2001CHEVY EXPRESS G3500, VAN PASSENGER EXTENDED, 6.5 FREPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALGAUGESANALOG INSTRUMENT PANELSPROGRAMMINGOFFBOARD PROGRAMMING
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 F
OFFBOARD Programming
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 FSECTION OFFBOARD Programming
- Obtain the VIN of the vehicle for which the control module is being programmed.
- Select Service Programming with the Techline terminal.
- Turn ignition switch to RUN position.
- Select Tech 2, Reprogram ECU, and Off-Board Programming Adapter as the electronic control unit (ECU) location.
- With the Tech 2, select Service Programming Request Information function. Tech 2 communicates with the control module and receives the access code.
- With the Tech 2, exit the Service Programming Request Information.
- Disconnect the Tech 2 from the Off-Board Programming Adapter.
- Connect the Tech 2 to the Techline terminal.
- Turn the Tech 2 ON.
- With the Techline terminal, enter the VIN of the vehicle that will be receiving the control module.
- The Techline terminal will display the message, attaching to database.
- Identify what type of programming you are performing.
- Select appropriate calibration file.
- Ensure all connections are secure.
- The Techline terminal displays a summary screen that summarizes your selections. After confirming you choices, Techline terminal automatically loads the calibration files to the Tech 2.
- After the download is complete, turn the Tech 2 OFF.
- Disconnect the Tech 2 from the Techline terminal.
- Connect the Tech 2 to the Off-Board Programming Adapter.
- With the Tech 2, select Service Programming.
- With the Tech 2, select Program.
- After the download is complete, exit Service Programming.
- Turn OFF the Off-Board Programming Adapter.
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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.