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Home >> GMC >> 2021 >> Acadia AT4 >> Repair and Diagnosis >> External Pages >> Different car >> Section 413 (Automatic Transmission - 9T60 (M3G) Or 9T65 (M3W) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> No Reverse Gear

No Reverse Gear

WARNING: This page is about a different car, the 2023 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
Checks Causes
Automatic Transmission Output Speed Sensor (712)
  • Inspect for faulty or damaged Automatic Transmission Output Speed Sensor (712).
Control Valve Body (23)
  • Inspect the 3-8 Clutch Regulator Valve (487) and Control Valve Body Ball Check Valve (453) for debris and stickyness.
  • Inspect the Clutch Selector Valve (467) and the Actuator Feed Limit Valve (451) for debris and stickyness.
Automatic Transmission Case (19)
  • Inspect the Input Shaft Support (54) for missing or damaged Fluid Seal Rings (56).
1-Reverse and 1-2-3-4-5-6 Clutch Piston Housing (590)
  • Verify the 1-Reverse and 1-2-3-4-5-6 Clutch Piston Housing (590) Selectable One Way Clutch functionality (spins freely counterclockwise, holds clockwise). No specific procedure available to check Selectable One Way Clutch reverse actuation.
5-7-Reverse and 6-7-8-9 Clutch Housing (516)
  • Inspect for damaged, stripped or sheared splines on 5-7-Reverse Clutch Plate (579-580), 5-7-Reverse Clutch Backing Plate (581).
  • Inspect for stripped or sheared splines on 5-7-Reverse and 6-7-8-9 Clutch Housing (567) to Turbine Shaft (547).
  • Inspect for damage, improper surface finish, porosity, deformed or unbalanced 5-7 Rev/4-5-6 Housing (516).
  • Inspect for damaged, worn, loose or seized hub bushing in the 5-7-Reverse and 6-7-8-9 Clutch Housing (567).
  • Inspect for broken, porous or improper surface finish or plugged oil passages of the 5-7-Reverse and 6-7-8-9 Clutch Housing (567).
  • Inspect for failure of the 6-7-8-9 and 5-7-Reverse Clutch Housing Thrust Bearing (515).
  • Inspect for disengaged or broken 5-7-Reverse Clutch Backing Plate Retaining Ring (582).
  • Inspect for damaged, worn or leaking 5-7 Reverse Clutch Piston Seals (564 - 566).
  • Inspect for damaged or broken 5-7-Reverse and 6-7-8-9 Clutch Housing (567).
  • Inspect for warped, damaged, improper surface finish or debonding 5-7 Reverse Clutch Piston (562).
  • Inspect for broken or fatiqued 5-7-Reverse Clutch Piston Retainer Spring (563).
  • Inspect for disengaged or broken Automatic Transmission Input Shaft Speed Sensor Reluctor Ring Retaining Ring (560).
  • Inspect for broken Automatic Transmission Input Shaft Speed Sensor Reluctor Wheel (561).
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