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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 >> Harsh Shifts

Harsh Shifts

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Harsh Shifts

Checks Causes
DEFINITION: High Line Pressure
Actuator Feed Limit Valve Stuck open
Calibrations Not updated or incorrect platform
Checkballs Missing
Final Drive Internal Gear Snap Ring Missing
PCS Feed Valve Stuck
Pressure Control Solenoid (PCS)
  • Failed OFF, intermittent short
  • Loose connector
Pressure Reg. Boost Valve Stuck open
Pressure Reg. Valve Stuck at high torque signal due to undersized bore, sediment or Pressure Control Solenoid failure
Transmission Wiring Harness Loose connection at vehicle harness