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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - Service, Diagnosis & Troubleshooting) >> First Gear Range Only - No Upshift

First Gear Range Only - No Upshift

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1st Gear Range Only - No Upshift

Checks Causes
Control Valve Body (60)
  • The 1-2 Shift valve is sticking
  • The spacer plate or gaskets are mispositioned or damaged
Case (103) The case to valve body face is damaged or is not flat
Shift Solenoid Valves (366/368)
  • Stuck or damaged
  • Faulty electrical connection
2-4 Servo Assembly (13-28)
  • The apply passage case is restricted or blocked
  • Nicks or burrs on the servo pin or on the pin bore in the case
  • Fourth servo piston is installed backwards
2-4 Band Assembly (602)
  • The 2-4 band is worn or damaged
  • The band anchor pin is not engaged
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