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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 First Gear

No First Gear

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No First Gear

Checks Causes
1-2 and/or 2-3 Shift Solenoid Valve
  • Debris
  • Pinched or damaged wires
  • Inoperative
Checkball in Housing Leaking
Detent Lever Misaligned
Forward Clutch Piston Cracked or damaged
Forward Clutch Piston Seals Leaking, cut or rolled
Forward Clutch Plates Burned, damaged
Forward Sprag Damaged, not holding
FWD/Coast Housing Broken or spline damage
Lo Roller Clutch Worn or damaged
Manual Valve Misaligned
Oil Transfer Sleeve Misaligned, damaged, leaking