LEMON Manuals: Even more car manuals for everyone
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 First, Second, Third, and Fourth Gear

No First, Second, Third, and Fourth Gear

WARNING: This page is about a different variant/trim than selected.
Checks Causes
Control Solenoid (w/Body and TCM) Valve Assembly Check 1-2-3-4 PC Solenoid 5 for proper operation. Refer to Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test .
Control Valve Body Assembly Inspect 1-2-3-4 Clutch Regulator Valve (417) and 1-2-3-4 Clutch Boost Valve (414) for debris and stickyness.
1-2-3-4 Clutch Assembly
  • Inspect for damaged, stripped or sheared splines on 1-2-3-4 Clutch Plates (557-559), Backing Plate (560).
  • Inspect for damaged or broken 1-2-3-4 Clutch Piston (552) and Piston Seals damaged, worn or delaminating.
  • Inspect for broken or fatigued 1-2-3-4 Clutch Piston Return Spring (553).
  • Inspect for broken or disengaged 1-2-3-4 Clutch Piston Return Spring Retainer (554).
  • Inspect for broken or fatigued 1-2-3-4 Clutch Waved Plate (557).
  • Inspect for disengaged or broken 1-2-3-4 Clutch Backing Plate Retainer (561).
  • Inspect for broken, porous or improper surface finish or plugged oil passages of the Low-Reverse/1-2-3-4 Clutch Housing (551).
  • Inspect for worn or damaged Low-Reverse/ 1-2-3-4 Clutch Housing (551) splines.
Output Sun Gear Assembly (555) Inspect for stripped or sheared splines on the Output Sun Gear shell.
Reaction Carrier Assembly (567)
  • Inspect for stripped or sheared splines on the Input Ring Gear
  • Inspect for disengaged or broken Input Ring Gear Retainer.
Output Carrier Assembly (574)
  • Low/Reverse Clutch Assembly (OWC) (543) splines stripped or sheared.
  • Inspect for disengaged or broken Reaction Ring Gear Retainer.
Case Assembly (50)
  1. Inspect for leaking or damaged 1-2-3-4 and Low-Reverse Clutch Fluid Passage Seals (67).
  2. Inspect for worn or damaged case splines or retainer ring grooves.
Input Sun Gear (571) Inspect for damaged gear teeth and damaged splines.
Turbine Shaft (517) Inspect for damaged splines to the Input Shaft Sun Gear.
scientia non olet · About LEMON Manuals