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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 72 (Automatic Transaxle - 4T80-E - Service, Diagnosis & Troubleshooting) >> No Torque Converter Clutch Apply

No Torque Converter Clutch Apply

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
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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