GM Service Manual Online
For 1990-2009 cars only

Checks

Cause

DEFINITION: The transmission only provides first and second gear in Drive range. The shift pattern as the vehicle accelerates from a stop is 1-2-2-1. First gear ratio is 2.921:1 and second gear ratio is 1.568:1.

Control Valve Body Assembly

    • A faulty 2-3 shift solenoid valve assembly (315B) is stuck On.
    • Debris is found in the control valve body (301) or the control valve body spacer plate and gasket assembly (396)