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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 D2, D3, D4

No First Gear D2, D3, D4

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No First Gear D2, D3, D4

Checks Causes
1-2 Shift Solenoid Valve
  • Debris, or failed OFF
  • Pinched or damaged wires, inoperative
1-2 Shift Valve Stuck in upshifted position
Checkball No. 8 Missing
Checkballs Missing from FWD/coast clutch
Forward Clutch Piston Damaged or cracked
Forward Clutch Piston Seals Rolled, cut or damaged
Forward Sprag Damaged, not holding
FWD/CC Studs Damaged, broken
FWD/CC Support Seals Damaged
Lo/Rev Servo Apply Pin Apply pin damage
Lo Roller Clutch Worn or damaged
Support Housing Seal Rings Leaking, damaged or cut