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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 Drive in All Ranges

No Drive in All Ranges

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Checks Causes
Case Assembly (50)
  • Inspect for cracked or broken Case (50).
  • Inspect for stripped or sheared splines.
  • Inspect for binding Manual Shift Detent Lever Assembly (609).
  • Inspect for missing Manual Shift Shaft Pin (611).
  • Inspect for missing Manual Shaft Lever Pin (610).
  • Inspect for interference or binding Park Pawl Actuator Assembly (607).
  • Inspect for broken or disengaged 1-2-3-4 Clutch Backing Plate Retainer Ring (561).
  • Inspect for loose or damaged case bushing.
  • Inspect A/Trans Fluid Pump Seal Assembly (25) for damage.
Torque Converter (28)
  • Inspect for stripped or sheared splines on Turbine Shaft.
  • Inspect for missing Torque Converter to Flywheel bolts.
  • Inspect for damaged or disengaged Torque Converter Hub to Oil Pump Drive Gear.
Torque Converter Housing (208)
  • Inspect for stripped or sheared Differential Ring Gear splines.
  • Inspect for broken or disengaged Differential Ring Gear Retainer (206).
  • Inspect for loose, missing or broken Torque Converter and Differential Housing bolts (26).
  • Inspect for loose, missing or broken Fluid Pump bolts (200).
3-5 R/4-5-6 Housing Assembly (516)
  • Inspect for damaged or broken Input Shaft Thrust Bearing Assembly (538).
  • Inspect for stripped or sheared splines on the Input Shaft to the 3-5 Reverse/4-5-6 Clutch Housing (516).
Oil Pump Assembly (201)
  • Inspect for fluid leaks/improper fluid level.
  • Inspect for leaking Fluid Outlet Seal Assembly (24).
  • Inspect for loose or missing Oil Pump Bolts (200).
  • Inspect for damaged, restricted or improperly installed Oil Filter Assembly (203).
  • Inspect for damaged or leaking Oil Filter Neck Seal.
  • Inspect for broken or seized Fluid Pump Drive Gear (315) and Fluid Pump Driven Gear (316).
Low & Reverse Clutch Assembly (543) Inspect for stripped or sheared splines to the Reaction Carrier (567).
Input Carrier Assembly (570)
  • Inspect for stripped or sheared castle splines to ring gear.
  • Inspect for improperly installed carrier pinion gear pins.
  • Inspect for damaged or broken Pinion Gears.
  • Inspect for stripped or sheared splines on the Input Sun Gear (571).
  • Inspect for damaged or broken Output Internal Gear.
  • Inspect for broken or disengaged Output Internal Gear Retainer Ring.
  • Inspect for damaged or broken Input Carrier Thrust Bearing Assembly (568) and Output Carrier Thrust Bearing Assembly (573).
  • Inspect for damaged or broken Input Carrier Thrust Bearings (569, 572).
Reaction Carrier Assembly (567)
  • Inspect for stripped or sheared Reaction Carrier Assembly (567) splines.
  • Inspect for damaged or broken Input Carrier Thrust Bearings (568).
  • Inspect for damaged or broken Pinion Gear teeth.
  • Inspect for damaged or broken Reaction Internal Gear teeth.
  • Inspect for disengaged or broken Reaction Internal Gear retainer ring.
Reaction Sun Gear Assembly (566)
  • Inspect for damaged or broken weld at Sun Gear.
  • Inspect for loose or worn Reaction Sun Gear Assembly bushing.
Output Carrier Assembly (574)
  • Inspect for stripped or sheared splines to reaction internal ring gear.
  • Inspect for damaged or broken Input Sun Gear Thrust Bearings (572).
  • Inspect for damaged or broken Pinion Gear teeth.
  • Inspect for damaged or broken Input Carrier Thrust Bearings (573).
  • Inspect for broken or damaged Output Internal Gear.
Output Sun Gear Assembly (555)
  • Inspect for stripped or sheared Output Sun Gear Assembly (555) splines.
  • Inspect for broken Output Sun Gear Assembly (555) hub or weld.
Low-Reverse and 1-2-3-4 Clutch Housing (551) Inspect for disengaged or broken 1-2-3-4 Clutch Piston Spring Retainer (554).
Drive Link Assembly (225)
  • Inspect for broken, worn or damaged Drive Link Assembly (225).
  • Inspect for broken, worn or damaged Drive Sprocket (224).
  • Inspect for broken, worn or damaged Driven Sprocket Assembly (229).
  • Inspect for broken Drive Gear Hub (222).
Differential Carrier Assembly (232)
  • Inspect for stripped or sheared splines on Differential Side Gear.
  • Inspect for stripped or sheared splines Final Drive Sun Gear (230).
  • Inspect for stripped or sheared splines Differential Carrier to PTU (AWD only).
  • Inspect for stripped broken or disengaged Final Drive Retainer (581).
  • Inspect for damaged or broken Pinion Gear teeth.
  • Inspect for damaged or broken Final Drive Rollers (585).
  • Inspect for broken, worn or damaged Final Drive Inner and Outer Thrust Washers (584).
Control Solenoid (w/Body and TCM) Valve Assembly
  • Check that the Manual Valve (432) is engaged with Manual Shift Detent Lever Assembly (609).
  • Inspect the Control Solenoid (w/Body and TCM) Valve Assembly (7) and verify that it is functioning properly.