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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1004 (Automatic Transmission - 4L80-E/4L85-E (Troubleshooting)) >> Troubleshooting >> No Third Gear - D4

No Third Gear - D4

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
No Third Gear - D4

Checks Cause
Direct Clutch Components
  • Seal (620, 621, 622)
 Leaking
  • Ball Check
 Leaking
  • Piston (619)
 Cracked or jammed
  • Housing (623)
 Cracked
  • Reaction Plates (618)
 Worn splines
  • Friction Plates (611)
 Worn splines or worn friction
  • Spring Assembly (607)
 Jammed
  • Center Support Seals (639)
 The seals are leaking at the center support hub.
  • Center Support (640)
 The support is broken or leaking at the case.
  • Center Support Bolt (25)
  • Loose or broken
  • Blocked hole
  • 2-3 Solenoid (311)
  • Stuck Off
  • Pinched wire
  • O-ring failure
  • No voltage to the solenoid
  • PCM
 No signal to the solenoid
  • 2-3 Shift Valve (312)
 Stuck
  • PCM
 Failed
Check the PCM for current DTCs.
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