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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 154 (Automatic Transmission - 4L80-E/4L85-E - Service, Diagnosis & Troubleshooting) >> Loss of Power

Loss of Power

WARNING: This page is about a different car, the 2007 GMC Yukon XL and 2007 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.
Loss of Power

Checks Cause
Transmission
  • Low oil
  • Not starting in first gear
TCC System TCC is stuck On, or TCC is dragging.
Torque Converter (1)
  • Debris in the converter
  • Stator loose
Stator Shaft (235) The shaft is broken.
Turbine Shaft (502) The bushing is worn.
Mainshaft (662) The bushing is worn.
Output Shaft (671) The bushing is worn.
Bearing (668) The bearing is worn.