No Torque Converter Clutch Apply (300 RPM Slip)

WARNING: This page is about a different car, the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

No Torque Converter Clutch (TCC) Apply

Checks	Causes
Valve Body Assembly (60)	Regulator apply valve side loading Stuck converter clutch valve Torque converter clutch (TCC) apply valve stuck closed (debris in bore) Torque converter clutch pulse width modulated (TCC PWM) solenoid broken/cracked Turbine shaft O-ring omitted TCC PWM solenoid leaking
Input Housing and Turbine Shaft Assembly (621)	Turbine shaft hole not drilled to full depth Scratched turbine shaft journals Turbine shaft O-ring omitted/damaged Turbine shaft retainer and ball assembly restricted or damaged
Electrical	12 volts not supplied to transmission Outside electrical connector damaged Inside electrical connector damaged Wire harness damaged TCC solenoid damaged Electrical short (pinched wire) TCC solenoid not grounded
Torque Converter Clutch (1)	Internal damage (blue or distorted)
Oil Pump Assembly (4)	TCC spring cocked Orifice cup plug restricted or damaged Pump to case gasket mispositioned Converter clutch valve retaining ring mispositioned Converter clutch valve stuck or assembled backward
Transmission Fluid Pressure Manual Valve Position Switch (69)	Contamination Damaged seals
Solenoid Screen (367A/367B)	Blocked
TCC Solenoid Valve (Part of 66)	Internal damage
Engine Speed Sensor	Internal damage
Engine Coolant Temperature Sensor	Internal damage
Automatic Transmission Fluid Temperature Sensor (Part of 69)	Internal damage
Brake Switch	Internal damage
TCM	Internal damage
TCC PWM Solenoid (Part of 66)	Internal damage