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Draining & Refilling: Transmission

WARNING: This page is about a different car, the 2002 GMC Sierra and 2002 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Transmission is equipped with an external control main "spin on" filter, which can be replaced without draining the transmission fluid from the pan. The control main filter is to be changed after the first 5000 miles. Failure to change the filter at this interval may cause DTC P0701 and other pressure switch DTCs to set.
NOTE: Transmission is also equipped with an internal fluid pick up filter screen that can be serviced only by removing the oil pan. See INTERNAL FILTER REPLACEMENT  .
  1. Remove drain plug (6) and drain plug seal (5). See Fig 1 . Drain the transmission fluid into a suitable container.
  2. Inspect the drained fluid. See CHECKING FLUID CONDITION  under CHECKING FLUID LEVEL & CONDITION (TRANSMISSION).
    3. NOTE: Use a standard strap type filter wrench to remove the control main filter.
  3. Remove filter (4) by rotating it in the counterclockwise direction. See Fig 1 . Remove the magnet (2) from the filter attachment tube (1) in the converter housing or from the top of the control main filter (3).
  4. Clean any metal debris from the magnet. Presence of any metal pieces larger than dust may indicate that transmission replacement or overhaul is required.
    5. NOTE: Turning the control main filter more than one full turn after gasket contact will damage the filter and may cause fluid leakage.
  5. Reinstall the magnet (2) onto the filter attachment tube (1) which is in the converter housing. See Fig 1 . Lubricate the gasket (3) on the control main filter with transmission fluid. Install, by hand, the control main filter (4) until the gasket on the control main filter touches the converter housing. Turn the filter ONE FULL TURN ONLY after gasket contact.
  6. Reinstall the drain plug (6) and drain plug seal (5). Tighten the drain plug to specification. See TORQUE SPECIFICATIONS  .
  7. Fill transmission with appropriate fluid to proper level. See RECOMMENDED FLUIDS  and FLUID CAPACITIES  .
    NOTE: DTC P0701 may often set following fluid service. Cycling the ignition clears the code and allows Drive or Reverse range to be attained. Cycle the ignition until Drive or Reverse range is attained.
  8. Check the transmission fluid level. See CHECKING FLUID LEVEL & CONDITION (TRANSMISSION)  .
Fig 1: Removing & Installing Oil Filter & Drain Plug
G00092185Courtesy of GENERAL MOTORS CORP.
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