GM Service Manual Online
For 1990-2009 cars only

Condition

Possible Cause

No 1-2 Upshift

    • TV cable out of adjustment, binding or damaged
    • Throttle valve binding or sticking
    • 1-2 shift valve binding or sticking
    • Primary regulator valve binding or sticking
    • Intermediate servo seals cut or damaged
    • Intermediate servo piston binding or sticking
    • Intermediate servo piston rod not engaged
    • 2nd brake band worn or out of adjustment
    • Incorrect line pressure