GM Service Manual Online
For 1990-2009 cars only

Third and Fourth Gear Only

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 spacer plate assembly (370)