Torque Converter Clutch Circuit Performance/Stuck Off
When the TCM commands torque converter lockup, the actual slip stays above threshold — the clutch is not engaging. Often signals worn TCC friction material; transmission fluid analysis usually shows debris.
Affected components
- Torque converter
- Tcc solenoid
- Transmission valve body
Common causes
- High likelihood: TCC friction material worn
- Medium likelihood: TCC solenoid stuck or slow to react
- Medium likelihood: Valve body wear (loss of clamping pressure)
Possible symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Diagnostic notes
- The malfunction indicator lamp may illuminate
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.