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 Reverse Gear

No Reverse Gear

WARNING: This page is about a different variant/trim than selected.
Checks Causes
Control Solenoid (w/Body and TCM) Valve Assembly Check the 3-5 R PC Solenoid 2 for proper operation. Refer to Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test .
Control Valve Body Assembly
  • Inspect the 3-5-Reverse Clutch Regulator Valve (421) and Control Valve Body Ball Check Valve (404) for debris and stickyness.
  • Inspect the Clutch Select Valve (428) and the Actuator Feed Limit Valve (430) for debris and stickyness.
Low and Reverse Clutch
  • Inspect for stripped or sheared splines on Low and Reverse Clutch Plates (545-547)
  • Inspect for damaged, deformed or improper surface finish on the Low and Reverse Clutch Plates (545-547)
  • Inspect for stripped or sheared splines on Low and Reverse Clutch Backing Plate (544)
  • Inspect for worn, damaged or debonding Low and Reverse Clutch Piston Seals (550)
  • Inspect for broken or fatigued Low and Reverse Clutch Piston Return Spring (549)
Transmission Case Assembly Inspect the Input Shaft Support (56) for missing or damaged Fluid Seal Rings (58).
3-5 Reverse Clutch Assembly
  • Inspect for damaged, stripped or sheared splines on 3-5 Reverse Clutch Plates (507-509), Backing Plate (510).
  • Inspect for stripped or sheared splines on 3-5 Rev/4-5-6 Housing to Turbine Shaft (516).
  • 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 Retainer (511).
  • Inspect for damaged, worn or leaking 3-5 Reverse Clutch Piston Seals (504-506).
  • 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 broken Speed Sensor Reluctor Wheel (501).