Truck wont shift outta 1st gear - 2003 GMC Sierra 1500

Is the check engine light on ? . What transmission 4L80E / 4L85-E or 4L60-E / 4L65-E
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