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Home >> Buick >> 2011 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Automatic Transmission - 4T80-E - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> No Third Gear - D3

No Third Gear - D3

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No Third Gear - D3

Checks Causes
1-2 Shift Solenoid Valve
  • Debris
  • Wires pinched or damaged
  • Inoperative
2-3 Shift Solenoid Valve
  • Debris
  • Wires pinched or damaged
  • Inoperative
  • Physical damage
3-4 Shift Valve Bore Plug Misassembled
3rd Clutch Piston Cracked, damaged, checkball damage
3rd Clutch Plates Burned, splines damaged
3rd Clutch Seals on Piston Cut or rolled
Checkballs Missing or stuck
Driven Sprocket Support Valve improperly installed
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