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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 358 (Automatic Transmission - 6T50 (M2D) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Harsh or Late First, Second, Third, and Fourth Shift

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

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
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 (557-559). 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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