First and Fourth Gear Only (1-2 Solenoid Stuck On)

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.

Checks	Cause
DEFINITION: The transmission only provides first and fourth gear in Drive range. The shift pattern as the vehicle accelerates from a stop is 1-1-4-4. First gear ratio is 2.921:1 and fourth gear ratio is 0.705:1.
Control Valve Body Assembly	A faulty 1-2, 3-4 shift solenoid valve assembly (315A) is stuck On. Debris is found in the control valve body (301) or the control valve body spacer plate and gasket assembly (396)