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Home >> Buick >> 2011 >> Lucerne CX >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 4T65-E - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> Converter Clutch Apply Rough, Slips, or Shudders

Converter Clutch Apply Rough, Slips, or Shudders

Soft TCC Apply (Shudder)

Checks Cause
DEFINITION: An unacceptably long TCC apply occurs in third or fourth gear, Drive or Manual Third range, with the throttle held steady. This can cause a momentary rapid jerking sensation in the vehicle during the TCC apply.
Control Valve Body Assembly
  • The TCC regulator apply valve (327) is stuck or binding.
  • The TCC regulator apply valve spring (326) is missing or damaged.
  • The control valve body spacer plate gaskets assembly (396) are misassembled or contain incorrect parts.
  • TCC control valve stuck or binding.
  • TCC control valve spring is missing or damaged.
  • TCC PWM solenoid faulty.
Case Cover Assembly The TCC blowoff ball valve (420B) or the spring (418) is damaged or is not seating.
Turbine Shaft Assembly
  • The turbine shaft O-ring seal (520) is damaged or is missing.
  • The turbine shaft oil seal rings (513, 519) are damaged or missing.
  • The turbine shaft (518) is damaged.
Drive Sprocket Support Assembly The turbine shaft bushing (523) is worn or damaged.
Torque Converter Assembly
  • The torque converter bushing is worn or damaged
  • The torque converter cover surface is damaged under lug thread(s) due to the flexplate bolt bottoms out.
  • The torque converter is damaged internally
    • The TCC friction material is missing or damaged
    • The TCC plate is distorted or damaged
    • The torque converter internal O-ring seal is missing or damaged