GM Service Manual Online
For 1990-2009 cars only

Problem

Action

Throttle valve cable is out of adjustment, binding or damaged

Adjust or replace the throttle valve cable.

Throttle valve is binding or sticking

Inspect the valve body.

1-2 shift valve is binding or sticking

Inspect the valve body.

Primary regulator valve is binding or sticking

Inspect the valve body.

Intermediate servo seals are cut or damaged

Inspect the intermediate servo seals.

Intermediate servo piston is binding or sticking

Inspect the intermediate servo piston.

2nd brake band is worn or out of alignment

Inspect the 2nd brake band.

Fluid pressure is incorrect

Perform the line pressure diagnosis.