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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Automatic Transmission - 6T50 (M2D) - Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> No Fourth, Fifth, And Sixth Gear

No Fourth, Fifth, And Sixth Gear

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Checks Causes
4 - 5 - 6 Clutch Assembly
  • Inspect for damaged, stripped or sheared splines on 4 - 5 - 6 Clutch Plates (526 - 528), Backing Plate (529)
  • Inspect for broken or fatigued 4 - 5 - 6 Clutch Waved Plate (525)
  • Inspect for damaged or broken 4 - 5 - 6 Clutch Piston (520) and Piston Seals (518, 519, 521)
  • Inspect for broken or fatigued 4 - 5 - 6 Piston Return Spring (522)
  • Inspect for broken or disengaged 4 - 5 - 6 Backing Plate Retainer (532)
  • Inspect for damaged or broken 4 - 5 - 6 Clutch Dam Piston (523) and piston seals damaged, worn or delaminating
  • Inspect for broken or disengaged 4 - 5 - 6 Clutch Dam Retainer (524)
  • Inspect for stripped or sheared splines on the Reaction Carrier Hub (531)
  • Inspect for stripped or sheared splines on 3 - 5 Rev/4 - 5 - 6 Housing to Turbine Shaft (516)
  • Inspect for loose, worn or damaged 3 - 5 Rev/4 - 5 - 6 Housing Bushing
  • Inspect for broken, porous or improper surface finish or plugged oil passages of the 3 - 5 Rev/4 - 5 - 6 Housing (516)
Transmission Case Assembly Inspect the input shaft support (56) for missing or damaged fluid ring seals (58).
Control Valve Body Assembly Inspect the reverse and 4-5-6 regulator valve (411) and ball check valve (404) for debris and stickiness.
Control Solenoid (w/Body and TCM) Valve Assembly Check the pressure control solenoid 3 (R1/456) for proper operation. Refer to Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test .
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