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Home >> Cadillac >> 2018 >> Escalade Base, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 19 (Automatic Transmission - 6L80 (MYC) Or 6L90 (MYD) - Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> No Reverse Gear

No Reverse Gear

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Checks Causes
A//Trans Fluid Pan Assembly (29) Verify proper fluid level and condition, inspect transmission assembly for leaks.
Control Valve Upper Body Assembly (304)
  • Inspect for sticking, damaged, or worn 3-5-R regulator valve (336) and valve spring (326).
  • Inspect for damaged or missing #5 ball check valve.
Control Valve Lower Body Assembly (307) Inspect for worn, damaged, or sticking clutch select solenoid valve 3 (352) and valve spring (353).
1-2-3-4 and 3-5-R Clutch Assembly (51)
  • Inspect for proper installation of 3-5-R clutch backing plate retaining ring (400).
  • Inspect for worn, damaged, or leaking clutch bearing seal assembly (428).
  • Inspect for damaged or worn 3-5-R clutch plates (401 - 404).
  • Inspect for damaged 3-5-R clutch piston (421), apply ring (405), and spring (420).
  • Inspect for cut, worn, or damaged 3-5-R clutch piston dam O-ring seal (418), inner seal (419), and outer seal (422).
  • Inspect for improper selective 3-5-R clutch backing plate retaining ring (400).
Torque Converter (with Fluid Pump) Housing Assembly (2)
  • Inspect for worn or damaged 1-2-3-4 and 3-5-R clutch fluid seal rings (230).
  • Inspect for damaged or scored pump housing (203), cover (219), rotor (217), slide (212), and vanes (216).
  • Inspect for damaged or porous pump cover assembly (219). Inspect pump surfaces for flatness.
  • Inspect for excessive fluid pump rotor (217) clearance or damage. Ensure proper selective rotor is being utilized.
Center Support Fluid Passage Seal Assembly (20), A/Trans Fluid Pump Seal Assemblies (18 and 19)
  • Inspect for worn, cut, or damaged seals.
  • Inspect for proper seal (20) size (6L45/50E MYA/MYB) vs (6L80/90E MYC/MYD).
Center (w/2-6 Low and Reverse Clutch) Support Assembly (67)
  • Inspect for damaged or leaking low and reverse clutch piston assembly (470).
  • Inspect for damaged or worn low and reverse clutch plates (462 - 465).
  • Inspect for damaged low clutch sprag assembly (467). Holding the sprag assembly with the retaining ring facing up, and the inner race of the sprag assembly fixed, the outer race should freewheel counterclockwise.
2-6 and 3-5-R Clutch (with Output Carrier Outer Sun Gear Shaft) Hub Assembly (64) Inspect for damaged or distorted shaft on hub assembly.
Output Shaft Assembly (70) Inspect for damaged or stripped splines on the output shaft.
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