GM Service Manual Online
For 1990-2009 cars only

No Second Gear, Slips in Second Gear

Checks

Causes

Second Clutch

No apply or slipping

Piston and Seal Assembly (404)

Binding, cracked, or leaking

Clutch Plates (96-99)

Worn friction or broken splines

Snap Ring (406)

Out of position

Spring (405)

Binding

Driven Sprocket Support (95)

Damaged, leaking, porous

Second Clutch Fluid Routing

Fluid leak or restriction

    â€¢ Valve Body
    â€¢ Gaskets and Spacer Plate
    â€¢ Channel Plate and Gasket
    â€¢ Driven Sprocket Support
    â€¢ Porosity
    â€¢ Misalignment
    â€¢ Loose or restricted
    â€¢ Fluid leak across the channels

Second Roller Clutch (452)

Damaged, not holding

1-2 Shift Solenoid Valve (305)

    â€¢ Stuck ON
    â€¢ Plugged

Forward Clutch

Low capacity shows up in Second Gear

Line Pressure

Low pressure

Refer to High or Low Line Pressure .

1-2 Accumulator (29-31)

    â€¢ Leak at the piston seal
    â€¢ Channel plate or case porosity

1-2 Accumulator Valve (323)

Stuck

2-3 Shift Valve (306)

Stuck in an upshifted position

PSA

Electrical or hydraulic malfunction