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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 153 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - Service, Diagnosis & Troubleshooting) >> Second Gear Start

Second Gear Start

WARNING: This page is about a different car, the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Second Gear Start

Checks Causes
Signal Noise on Vehicle Speed Sensor (VSS) Circuit Chassis vibrations, incorrect harness routing, owner installed electronic components creating electrical interference.
Diagnostic Trouble Code (DTC)
  • Electrical or mechanical 1-2 Shift Solenoid Valve (367) malfunction.
  • Sediment in the valve body may cause improper transmission fluid pressure (TFP) operation.
Leaking Actuator Feed Limit (AFL) Circuit Spacer plate (48), spacer plate gaskets (47 or 52), control valve body (60), mispositioned, damaged or poor sealing/mating surface exist.
Blocked or restricted Valve Body Spacer Plate (48) Spacer Plate to Case Gasket (47) or Spacer Plate to Valve Body Gasket (52) Trapped sediment or metal particles.
Stuck 1-2 Shift Valve (366)
  • Trapped sediment or metal particles.
  • Binding shift valve or worn valve body bore.
TFP manual valve position switch (69) TFP manual valve position switch (69) erratic operation.
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