GM Service Manual Online
For 1990-2009 cars only

Probable Cause

Action

DEFINITION: Gear disengagement occurs during normal operation.

The transmission shift control closeout boot is not positioned correctly.

  1. Inspect the transmission shift control closeout boot positioning.
  2. Reposition or replace the closeout boot, if necessary.
  3. Refer to Shift Control Shift Closeout Boot Replacement .

The transmission shift control is loose or damaged.

  1. Remove the transmission shift control.
  2. Inspect the shift control and replace if necessary.
  3. Refer to Shift Control Assembly Replacement .

The engine and/or transmission mount are loose or damaged.

  1. Inspect the engine mounts.
  2. Tighten to specifications or replace as necessary.
  3. Refer to Engine Mount Replacement .

  4. Inspect the transmission mount.
  5. Tighten to specifications or replace as necessary. Refer to Transmission Support and Mount Assembly Replacement .

The clutch housing is loose or misaligned.

  1. Inspect the clutch housing bolts.
  2. Tighten to specifications or replace as necessary.

  3. Inspect the clutch housing positioning.
  4. Reposition or replace the clutch housing as necessary.

The transmission has worn or damaged internal components.

  1. Remove the transmission.
  2. Refer to Transmission Replacement .

  3. Disassemble the transmission and inspect the internal components for wear or damage.
  4. Refer to Transmission/Transaxle/Transfer Case Unit Repair Manual.

  5. Install the transmission.
  6. Refer to Transmission Replacement .