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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle - 4T65-E - Service, Diagnosis & Troubleshooting >> Second and Third Gear Only (1-2 Solenoid Stuck Off)

Second and Third Gear Only (1-2 Solenoid Stuck Off)

Second and Third Gear Only (1-2 Solenoid Stuck Off)

Checks Cause
DEFINITION: The transmission only provides second and third gear in Drive range. The shift pattern as the vehicle accelerates from a stop is 2-2-3-3. Second gear ratio is 1.568:1 and third gear ratio is 1.000:1.
Control Valve Body Assembly
  • A faulty 1-2, 3-4 shift solenoid valve assembly (315A) is stuck Off.
  • A missing or damaged shift solenoid valve O-ring seal (316)
  • Plugged or damaged solenoid valve screen/seal assembly (382)
  • Debris is found in the control valve body (301) or the control valve body spacer plate and gasket assembly (396)
Case Cover Assembly A stuck, binding, or missing actuator feed limit valve line-up (414-416)