GM Service Manual Online
For 1990-2009 cars only

Condition

Action

DEFINITION: Excessive shock or flares on all upshifts and downshifts

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