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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 Fourth Gear

No Fourth Gear

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No Fourth Gear

Checks Causes
1-2 Shift Solenoid Valve
  • Inoperative
  • Debris
  • Pinched wires
3-4 Shift Valve Bore Plug Misassembled
4th Band Burned, slipping, missing
4th Servo Cover Cracked
4th Servo Pin Broken, seized
4th Servo Piston Damaged
4th Servo Seals Rolled, cut or damaged
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