Slipping or No Second Gear

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: A large engine RPM increase is noted in second gear, Drive range, with little or no vehicle forward speed increase. First, third and fourth gear operation are normal. Shifts into second gear are soft or do not occur. Second gear ratio is 1.568:1.
Automatic Transmission Fluid Level	Low fluid level
Transmission Main Line Pressure	Low transmission main line pressure
Oil Filter Assembly	The oil filter assembly (100) is missing, plugged or damaged. The oil filter seal assembly (101) is missing or is damaged.
Control Valve Body Assembly	The 1-2 shift valve (318) is stuck or binding. Debris is found in the passages of the control valve body (301) or of the control valve body spacer plate and gasket assembly (396)
Driven Sprocket Support Assembly	Damaged second clutch housing oil seal rings (613) Damaged four lobe oil seal ring seals (612) Worn or damaged second clutch housing bushings (616, 619)
Second Clutch Assembly	Missing or not seated second clutch backing plate retaining ring (627) Missing or misassembled second clutch backing plate (626) Worn, damaged or misassembled clutch plates (623-625) Missing or not seated second clutch spring retaining ring (622) Damaged spring assembly (621) or piston (620) Missing or damaged second clutch housing ball check valve assembly (618) Damaged second clutch housing assembly (617)