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.
2001 GMC C3500 HD 6.5 F, AutomaticFACTORY OEM SERVICE PROCEDURE
PCM Programming
- Verify the following for the setup:
- The battery is charged.
- The ignition is ON.
- The battery/cigarette lighter connection is secure.
- The data link connector (DLC) is attached.
- Perform the programming. Refer to the up to date Techline terminal/equipment for user instructions.
- Perform the Passlock Learn Procedure. Refer to Programming Theft Deterrent System Components in Theft Deterrent.
- After the vehicle has been programed, operate the vehicle until the coolant temperature is more than 77°C (170°F). This will allow the top dead center (TDC) offset to be programed. Refer to Programming the TDC Offset below.
- Check the Data list for a TDC offset.
- If the PCM fails to reprogram, do the following:
- Check all the powertrain control module (PCM) connections.
- Check the Techline terminal/equipment for the latest software version.
- Try again to reprogram the PCM. If the PCM fails again, replace the PCM. Refer to Powertrain Control Module (PCM) Replacement .
Factory Service Tools
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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.
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