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Home >> Chevrolet >> 2011 >> Impala LS, 3.9 M >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Automatic Transmission - 4T65-E - Symptom Troubleshooting & Diagnosis) >> First Gear Only

First Gear Only

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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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