GM Service Manual Online
For 1990-2009 cars only

Condition

Action

DEFINITION: Erratic shifting of gears: Does not shift into the D and I positions; starts off in 5th gear

    • Shift solenoid B inoperative
    • Shift valve B inoperative
    • Inspect the MIL indicator for loose connectors.
    • Inspect the O-ring and the shift solenoid valve for seizure.

DEFINITION: Erratic shifting gears: Does not shift into the D, I and L positions; starts off in 3rd gear.

    • Shift solenoid A inoperative
    • Shift valve A inoperative
    • Inspect the MIL indicator for loose connectors.
    • Inspect the O-ring and the shift solenoid valve for seizure.