Harsh Shifts

WARNING: This page is about a different car, the 2005 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.

Harsh Shifts

Check	Causes
DEFINITION: Harsh shift feel - an unacceptable quick gear change occurs.
Pressure Control Solenoid	Damaged O-rings Contamination
Output Speed Sensor	Open or grounded circuit
Input Speed Sensor	Open or grounded circuit
Throttle Position	Open or grounded circuit
Forward Clutch Assembly	Damaged or worn clutch plates Damaged or cut piston Damaged or stuck ball check valve
Control Valve Body Accumulator Assembly	Accumulator piston stuck Stuck or missing ball check valves
Fluid Pump	Pressure regulator valve stuck Pressure regulator valve spring Line boost valve spring Line boost valve or bushing stuck, damaged or incorrectly assembled Fluid pump screen assembly plugged or damaged Fluid pump rotor guide omitted or misassembled Fluid pump rotor cracked or broken Porosity in fluid pump Fluid pump surfaces not flat Excessive fluid pump rotor clearance Pump slide seal out of location Pump vanes damaged Pump slide spring damaged
Inspect for active transmission DTCs	Transmission DTC default action active