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Home >> Saturn >> 2008 >> Sky Base, Automatic >> Repair and Diagnosis >> Transmission >> Hydraulic Diagrams >> Automatic Transmission - 5L40-E/5L50-E - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis >> Diagnostic Information and Procedures >> No Fourth Gear, or Slips in Fourth Gear

No Fourth Gear, or Slips in Fourth Gear

Check Causes
DEFINITION: A large engine RPM is noted in fourth gear or no vehicle forward speed increase. Shifts into fourth gear are soft or do not occur.
Control Valve Body Accumulator Assembly
  • 3-4 shift valve stuck applied
  • 3-4 shift control valve stuck applied
Direct and Reverse Clutch
  • Damaged or worn piston (406)
  • Damaged or worn clutch plates
  • Damaged ball check valve (405)
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