GM Service Manual Online
For 1990-2009 cars only

Condition

Action

DEFINITION: Late shift from the N position to D and I positions or excessive shock felt when shifting into gear

    • Shift solenoid valve C inoperative
    • 1st clutch, pressure control solenoid inoperative
    • 2nd clutch, pressure control solenoid inoperative
    • TCC lock-up, pressure control solenoid inoperative
    • Shift cable broken or out of adjustment
    • Joint in the shift cable and the transmission or the body worn
    • Input speed sensor inoperative
    • Output shaft speed sensor inoperative
    • ATF temperature sensor inoperative
    • CPC valve A inoperative
    • CPC valve B inoperative
    • CPC valve C stuck
    • Foreign material in the spacer plate orifice
    • Shift valve C inoperative
    • Shift valve E inoperative
    • Servo control valve inoperative
    • 1st accumulator inoperative
    • 1st check ball stuck
    • One-way check ball stuck
    • 1st clutch inoperative
    • Inspect the MIL indicator for loose connectors.
    • Inspect the O-ring and the shift solenoid valve for seizure.
    • Inspect the valve body gasket of the AT clutch pressure control solenoid.
    • Inspect the ATF feed pipes for wear and damage.
    • Inspect the CPC valves if the AT clutch pressure control solenoid valve is stuck.
    • Inspect for a loose shift cable at the shift lever and the transmission control lever.
    • Inspect the 1st clutch pressure.
    • Inspect the clutch piston, the clutch piston check valve, 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.