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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) >> Second Gear Starts

Second Gear Starts

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.
Second Gear Starts

Checks Cause
Intermediate Clutch Plates (631, 632) Seized
Direct Clutch Lube Feed Blocked
Center Support Springs (635) Jammed
Center Support Piston (636) Jammed
1-2 Shift Solenoid Valve (313)
  • Stuck Off
  • O-ring failed
  • No voltage to the solenoid
  • Poor connection
PCM
  • No PCM signal to the solenoid
  • Failed
1-2 Shift Valve (314) Stuck
Check the PCM for current DTCs.