GM Service Manual Online
For 1990-2009 cars only
  1. The transmission must be in the vehicle and partially filled with fluid (approximately 8 quarts).
  2. To prime the auxiliary pump, use the Tech II and follow the listed menus in order:
  3. 2.1. Tech II Diagnosis
    2.2. 2008
    2.3. Car
    2.4. Chevy
    2.5. Z
    2.6. Hybrid
    2.7. Powertrain (F0)
    2.8. ECM (F1)
    2.9. Special Functions (F2)
    2.10. Hybrid Outputs (F1)
    2.11. Aux Trans Pump
    2.12. Aux Trans Fluid Pump Co.
    2.13. Aux Trans Fluid Pump Re ON/OFF
  4. During the last step, hold the power ON switch for approximately 30-60 seconds. The auxiliary pump will be primed.
  5. Remove Tech II tool.
  6. The transmission is ready to be topped off with transmission fluid.