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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 D3

No Overrun Braking in D3

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No Overrun Braking in D3

Checks Causes
1-2 Shift Solenoid Valve Debris, stuck
3-4 Shift Valve Debris, stuck
Coast Clutch Plates Burned or damaged
Coast Clutch Seal/Checkball Cut, worn or nicked
Fluid Level
  • Low
  • Stuck in upshift position
Forward Clutch Housing
  • Splines damaged
  • Housing cracked
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