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2006
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Sierra 1500 HD, 4WD
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Section 1728 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - Symptom Troubleshooting And Diagnosis)
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Torque Converter Clutch Intermittent - OK Cold/Slips Hot
Torque Converter Clutch Intermittent - OK Cold/Slips Hot
WARNING:
This page is about a different car, the 2010 GMC Sierra and 2010 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Checks
Causes
TCC PWM Solenoid (396)
Leaks
Regulator Apply Valve (216)
Sticking valve
Converter Clutch Shift Valve (224)
Sticking valve