GM Service Manual Online
For 1990-2009 cars only

Fourth Gear Only

Checks

Cause

DEFINITION: The transmission only provides fourth gear in Drive range. The vehicle accelerates from a stop in fourth gear and does not upshift. Fourth gear ratio is 0.705:1.

Control Valve Body Assembly

Debris is found in the control valve body (301) or the control valve body spacer plate and gasket assembly (396)