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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1328 (Automatic Transmission, 4L60-E/4L65-E (Troubleshooting)) >> Troubleshooting >> First Gear Range Only - No Upshift

First Gear Range Only - No Upshift

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
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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