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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1123 (Automatic Transaxle, 4T65-E Diagnostics (Troubleshooting)) >> Troubleshooting >> Harsh Torque Converter Clutch (TCC) Apply or Release

Harsh Torque Converter Clutch (TCC) Apply or Release

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
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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