GM Service Manual Online
For 1990-2009 cars only

Condition

Action

DEFINITION: Excessive shock, or flares on 3-4 upshift or 4-3 downshift

    • Shift solenoid valve C inoperative
    • 2nd clutch, pressure control solenoid inoperative
    • 4th clutch transmission fluid pressure switch inoperative
    • CPC valve B inoperative
    • Foreign material in the spacer plate orifice
    • Shift valve C inoperative
    • 3rd accumulator inoperative
    • 4th accumulator inoperative
    • 3rd clutch inoperative
    • 4th clutch inoperative
    • Inspect the MIL indicator for loose connectors.
    • Inspect the O-rings, and the shift solenoid valve for seizure.
    • Inspect for a clogged orifice in the transmission fluid pressure switch connector. If the orifice is clogged, remove it and clean the connector.
    • Inspect the 3rd and the 4th clutch pressures.
    • Inspect the clutch piston and the O-rings.
    • Inspect the clutch piston return spring retainer for wear and damage.
    • Inspect the clutch backing-plate-to-top-disc clearance. If the clearance is out of tolerance, inspect the clutch discs and plates for wear and damage. If the discs and plates are worn or damaged, replace the discs and plates as a set. If the discs and plates are in satisfactory condition, adjust the clutch backing plate clearance.