GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2002 🢒 GMC C Sierra - 2WD 🢒 Transmission/Transaxle 🢒 Automatic Transmission - Allison 🢒 Transmission Control Module Reprogramming

Set-up for Module Programming/Reprogramming

Important: 

   â€¢ Ensure that the vehicle battery is fully charged and that a battery charger is no longer connected. If performing this procedure for module replacement, install new module before proceeding.
      - Turn OFF all accessories.
      - Turn ON the ignition, with the engine OFF.
   â€¢ When a transmission control module (TCM) is updated or replaced, it is recommended to run the FastLearn procedure, using the Tech2. FastLearn is a procedure for Allison transmissions in which a series of tests are run to allow the TCM to learn individual clutch characteristics.

Remote Programming Feature
  1. Connect the scan tool to the vehicle.
  2. Power-up the scan tool and select the Service Programming feature.
  3. Select the appropriate vehicle.
  4. Press the Request Info button on the scan tool.
  5. Connect the scan tool to the computer station.
  6. Follow the menu select items for reprogramming and provide information as to what type of device you are programming and whether you are reprogramming or replacing the Electronic Control Unit (ECU).
  7. Select "vehicle" from the selection menu.
  8. Select the module you wish to Program/Reprogram.
  9. Select "Normal" for Programming Type.
  10. Select the applicable software calibrations.
  11. Transfer data file to the scan tool.
  12. Reconnect the scan tool to the vehicle.
  13. Turn ON the ignition, with the engine OFF.
  14. Select the Service Programming feature on the scan tool.
  15. Press the Program button on the scan tool.

Programming Using Scan Tool Pass-Through Connection
  1. Connect the scan tool to vehicle and power it up.
  2. Connect the computer station to the scan tool.
  3. Select "PC Using Scan Tool Connection" from the programming menu on the computer station.
  4. Follow the menu select items for reprogramming and provide information as to what type of device you are programming and whether you are reprogramming or replacing the ECU.
  5. Select "vehicle" from the selection menu.
  6. Select the module you wish to Program/Reprogram.
  7. Select "Normal" for Programming Type.
  8. Select the applicable software calibrations.
  9. Transfer data file to the scan tool.