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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 >> No Third, Fifth, and Reverse Gear

No Third, Fifth, and Reverse Gear

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Checks Causes
3-5 Reverse Clutch Assembly
  • Inspect for damaged, stripped or sheared splines on 3-5 Reverse Clutch Plates (507509), Backing Plate (510)
  • Inspect for sheared or stripped splines on 3-5 Rev/4-5-6 Housing (516) to Turbine Shaft (517)
  • Inspect for damage, improper surface finish, porosity, deformed or unbalanced 3-5 Rev/4-5-6 Housing (516)
  • Inspect for damaged, worn, loose or seized hub bushing in the 3-5 Rev/4-5-6 Housing
  • Inspect for broken, porous or improper surface finish or plugged oil passages of the 3-5 Rev/4-5-6 Housing (516)
  • Inspect for failure of the Input Shaft Thrust Bearing (538)
  • Inspect for disengaged or broken 3-5 Reverse Clutch Backing Plate (511)
  • Inspect for damaged, worn or leaking 3-5 Reverse Clutch Piston Seals (504506)
  • Inspect for damaged or broken 3-5 Rev/4-5-6 Clutch Housing (516)
  • Inspect for warped, damaged, improper surface finish or debonding 3-5 Reverse Clutch Piston (502)
  • Inspect for broken or fatigued 3-5 Reverse Clutch Spring (503)
  • Inspect for disengaged or broken Speed Sensor Reluctor Retainer (500)
  • Inspect for worn, broken or damaged Speed Sensor Reluctor Wheel (501)
Reaction Sun Gear Assembly (566) Inspect for stripped or sheared splines
Reaction Carrier (567)
  • Inspect for broken or disengaged Input Internal Gear Retainer
  • Inspect for stripped or sheared splines on the Input Internal Gear
Output Carrier (574) Inspect for stripped or sheared splines for the Reaction Internal Ring Gear
4-5-6 Clutch Assembly
  • Inspect for plugged or missing 4-5-6 Piston Dam Oil Feed hole
  • Inspect for leaking 4-5-6 Piston Dam