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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle - 4T65-E - Service, Diagnosis & Troubleshooting >> Third and Fourth Gear Only (2-3 Solenoid Stuck Off)

Third and Fourth Gear Only (2-3 Solenoid Stuck Off)

Third and Fourth Gear Only (2-3 Solenoid Stuck Off)

Checks Cause
DEFINITION: The transmission only provides third and fourth gear in Drive range. The shift pattern as the vehicle accelerates from a stop is 4-3-3-4. Third gear ratio is 1.000:1 and fourth gear ratio is 0.705:1.
Control Valve Body Assembly
  • A faulty 2-3 shift solenoid valve assembly (315B) is stuck Off.
  • A missing or mislocated 2-3 shift solenoid valve (315B) and retainer (314C)
  • 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)