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Home >> Chevrolet >> 2006 >> Uplander Base >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle - 4T65-E - Service, Diagnosis & Troubleshooting >> Diagnostic Information & Procedures >> Harsh Torque Converter Clutch (TCC) Apply or Release

Harsh Torque Converter Clutch (TCC) Apply or Release

Harsh TCC Apply or Release

Checks Cause
DEFINITION: An unacceptably quick TCC apply or release occurs in third or fourth gear, Drive or Manual third range, with the throttle held steady.
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 TCC control valve spring (336) is missing or damaged.
  • The control valve body spacer plate gaskets assembly (396) are misassembled or contain incorrect parts.
  • TCC PWM Solenoid faulty.
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