WARNING: This page is about a different car, the 2001 GMC Safari and 2001 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.

Turn off ignition. Install Tech 2(R) to DLC.
Turn ignition switch to RUN position, with engine off. Turn off all vehicle accessories.
With Tech 2(R), select Service Programming. Identify vehicle information as requested by Tech 2(R).
Select type of module you are programming. Select type of programming to be performed.
Verify displayed VIN with vehicle VIN. If displayed VIN does not match actual VIN, write down actual VIN and correct VIN at Techline(R) terminal.
When complete, exit Service Programming.
Turn off Tech 2(R) and disconnect Tech 2(R) from vehicle. Turn off ignition
Connect Tech 2(R) to Techline(R) terminal. Select Service Programming.
Select Tech 2(R) as tool you are using. Select type of programming to be performed.
Verify displayed VIN with vehicle VIN. Correct VIN as necessary. Select type of module you are programming.
Identify what type of programming that you are performing:
- Normal, this type of programming is for updating an existing calibration or programming a new controller.
- Vehicle Configuration Index (VCI), this selection is used if vehicle VIN is unavailable or not recognized by Techline(R) terminal. Observe, you will need to contact Techline(R) Customer Support center to use this option.
- Reconfigure, this is to reconfigure a vehicle, such as tire size and axle ratio changes.
Select appropriate calibration file.
Ensure all connections are secure. Select Reprog to initiate download of new calibration to Tech 2(R).
After download is complete, turn off Tech 2(R). Disconnect Tech 2(R) from Techline(R) terminal.
Install Tech 2(R) to data link connector (DLC). Turn ON Tech 2(R).
Turn ignition switch to RUN position, with engine off. Select Service Programming.
NOTE: DO NOT turn off ignition if programming procedure is interrupted or unsuccessful. Ensure that all PCM and DLC connections are secure and Techline(R) operating software is up to date. Attempt to reprogram control module. If PCM cannot be programmed, replace PCM. See POWERTRAIN CONTROL MODULE under REMOVAL & INSTALLATION.
Select Program.
After download is complete, exit Service Programming.
Turn off ignition for 30 seconds.
Turn off Tech 2(R).
If a control module is replaced following service procedures must be performed:
- Crankshaft Variation Learn Procedure. See CRANKSHAFT POSITION SENSOR VARIATION LEARN PROCEDURE .
- Inspection/Maintenance Complete System Set Procedure. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
- Passlock(tm) Learn Procedure. See PASSLOCK(tm) LEARN PROCEDURE under PROGRAMMING.

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.

Safety Warning

Remote Programming Procedure

Use the Manual With the Right Hardware

When to See a Mechanic