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Home >> Hummer >> 2009 >> H3T Alpha >> Repair and Diagnosis >> External Pages >> Different car >> Section 161 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis) >> Diagnostic Information and Procedures >> Second Gear Start

Second Gear Start

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.
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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