GM Service Manual Online
For 1990-2009 cars only

Condition

Action

DEFINITION: Excessive shock or flares on all upshifts and downshifts

    • 1st clutch, pressure control solenoid inoperative
    • Input speed sensor inoperative
    • Output shaft speed sensor inoperative
    • ATF temperature sensor inoperative
    • CPC valve A inoperative
    • Foreign material in the spacer plate orifice
    • Inspect the MIL indicator for loose connectors.
    • Inspect the valve body gasket of the AT clutch pressure control solenoid and ATF feed pipes for wear and damage.
    • Inspect the CPC valves if the AT clutch pressure control solenoid valve is stuck.
    • Inspect the sensor O-rings.