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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 Overrun Braking in D2

No Overrun Braking in D2

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No Overrun Braking in D2

Checks Causes
4th Band Slipping, burned
4th Band Servo Pin Stuck, broken
4th Servo Piston Damaged, cracked
4th Servo Seals Cut, rolled or damaged
Coast Clutch Plates Burned, damaged
Coast Clutch Seal/Checkball Cut, worn or nicked
Coast Clutch Support Seals Damaged, missing