LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2024 >> Terrain SLT, FWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 9T45 (M3U) Or 9T50 (M3D M3H) - Diagnostic Information And Procedures (2 Of 2) >> Diagnostic Information and Procedures >> No First and Reverse Gears

No First and Reverse Gears

Checks Causes
1-Reverse and 1-2-3-4-5-6 Clutch Piston Housing (521)
  • Inspect for stripped or sheared internal or external splines on Low and Reverse Clutch Assembly (521)
  • Inspect for broken or disengaged retainer ring
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
  • Inspect for discoloration/hot spotting from heat damage on 1-2-3-4-5-6 Clutch Plate (596) and 1-2-3-4-5-6 Clutch Backing Plate (598)
1-2-3-4-5-6 Clutch Piston (592)
  • Inspect for disengaged or broken Low and Reverse Clutch Piston Spring Retainer (594)
  • Inspect for broken or deformed Low and Reverse Clutch Piston (592)
  • Inspect for damaged or improper surface finish in the piston bore