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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 239 (Automatic Transaxle - 4T65-E - Service, Diagnosis & Troubleshooting) >> Diagnostic Information & Procedures >> First Gear Only

First Gear Only

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
First Gear Only

Checks Cause
DEFINITION: The transmission only provides first gear in Drive range. The vehicle accelerates from a stop in first gear and does not upshift. First gear ratio is 2.921:1.
Control Valve Body Assembly
  • The 1-2 shift valve (318) is stuck or binding.
  • Debris is found in the control valve body (301) or the control valve body spacer plate and gasket assembly (396)
  • The spacer plate and gaskets (369-371) are misassembled.
Second Clutch Assembly
  • A missing or not seated second clutch backing plate retaining ring (627)
  • A missing or misassembled second clutch backing plate (626)
  • Worn, damaged or misassembled clutch plates (623-625)
  • A missing or not seated second clutch spring retaining ring (622)
  • A damaged spring assembly (621) or piston (620)
  • A missing or damaged second clutch housing ball check valve assembly (618)
  • A damaged second clutch housing assembly (617)
Reverse Reaction Drum Damaged splines of the reverse reaction drum (669)
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