No Reverse Gear
WARNING: This page is about a different car, the 2020 Buick Regal and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
| Checks |
Causes |
| Control Valve Body (23) |
- Inspect the 3-8 Clutch Regulator Valve (487) and Control Valve Body Ball Check Valve (453) for debris and stickiness.
- Inspect the Clutch Selector Valve (467) and the Actuator Feed Limit Valve (451) for debris and stickiness.
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| Automatic Transmission Case (19) |
- Inspect the Input Shaft Support (54) for missing or damaged Fluid Seal Rings (56).
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| Low and Reverse Clutch (590) |
- Inspect for stripped or sheared splines on Low and Reverse Clutch Plates (596 - 597)
- Inspect for damaged, deformed or improper surface finish on the Low and Reverse Clutch Plates (596 - 597)
- Inspect for stripped or sheared splines on Low and Reverse Clutch Backing Plate (598)
- Inspect for worn, damaged or debonding Low and Reverse Clutch Piston Seals (592)
- Inspect for broken or fatigued Low and Reverse Clutch Piston Return Spring (593)
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| 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 3-5 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 3-5 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 3-5 Reverse Clutch Piston (562).
- Inspect for broken or fatigued 3-5-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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