LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2005 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 222 (Automatic Transmission - 5L40-E/5L50-E - Service, Diagnosis & Trouble Shooting) >> First Gear Only

First Gear Only

WARNING: This page is about a different car, the 2005 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
First Gear Only

Check Causes
DEFINITION: The transmission only provides first gear in Drive range. The vehicle accelerates from a stop in first gear and does not upshift.
Control Valve Body Accumulator Assembly
  • 1-2 shift control valve stuck applied
  • 1-2 shift valve stuck applied
Control Valve Body Accumulator Assembly The spacer plate or gasket are mispositioned or damaged
Shift Solenoid Valve
  • Stuck or damaged
  • Faulty electrical connection
scientia non olet · About LEMON Manuals