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Home >> GMC >> 2013 >> Yukon Base, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1728 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - Symptom Troubleshooting And Diagnosis) >> First Gear Range Only - No Upshift

First Gear Range Only - No Upshift

WARNING: This page is about a different car, the 2010 GMC Sierra and 2010 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
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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