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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Automatic Transmission - 6T40 - DTC P0973 To DTC P2764 And Troubleshooting Procedures) >> Diagnostic Information and Procedures >> Harsh or Late First, Second, Third, and Fourth Shift

Harsh or Late First, Second, Third, and Fourth Shift

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Checks Causes
Low/Reverse and 1-2-3-4 Clutch Housing (551)
  • Inspect for damaged or broken 1-2-3-4 Clutch Piston (552) and piston seals damaged, worn or leaking.
  • Inspect for fatigued or binding 1-2-3-4 Clutch Piston Return Spring (553).
  • Inspect for improper surface finish on 1-2-3-4 Clutch Plates (557559). Refer to Clutch Plate Diagnosis .
  • Inspect for broken or fatigued 1-2-3-4 Clutch Waved Plate (557).
  • Inspect for plugged or restricted Low/Reverse and 1-2-3-4 Clutch Piston Housing (551) air bleed.
Case Assembly (50)
  • Inspect for leaking or loose fitting Fluid Check Valve (55).
  • Inspect for leaking or damaged 1-2-3-4 and Low/Reverse Clutch Fluid Passage Seals (67).
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