GM Service Manual Online
For 1990-2009 cars only

Condition

Action

DEFINITION: No up shift or down shift

    â€¢ Input speed sensor inoperative
    â€¢ Output shaft speed sensor inoperative
    â€¢ Modulator valve inoperative
    â€¢ Inspect the MIL indicator for loose connectors.
    â€¢ Inspect the line pressure.