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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 Torque Converter Clutch Apply

No Torque Converter Clutch Apply

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No Torque Converter Clutch Apply

Checks Causes
3rd Clutch Filter Screen Clogged
Brake Switch
  • Contact corroded
  • Poor connection
  • Pinched wire
  • Misadjusted
  • No supply voltage
PCM No signal to solenoid
TCC Control Valve Stuck OFF due to sediment or undersized bore
TCC Feed Valve Stuck OFF due to sediment or undersized bore
TCC Regulating Valve Stuck OFF due to sediment or undersized bore
TCC Solenoid Valve
  • Stuck OFF
  • O-ring failed
  • No voltage to solenoid
  • Poor connection
TFT Incorrect reading (cold)
Torque Converter
  • Ballooning
  • TCC not engaging fully or slipping
Turbine Shaft to Drive Sprocket Support O-Ring Seal
  • Damaged or leaking
  • Worn
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