Transmission Does Not Shift Properly

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Condition	Action
Engine idle speed too fast during Neutral to range shift	Adjust to correct idle speed.
Faulty throttle sensor/circuit	Repair or replace the sensor or circuit.
Faulty or sticking bleed ball in C1 position housing	Repair the transmission.
Excessive clutch running clearance	Rebuild the transmission and adjust clearances.
Incorrect shift calibration for vehicle	Install the correct calibration.
Instrument panel tachometer incorrect	Repair or replace the tachometer.
Incorrectly calibrated electronic speedometer	Calibrate the electronic speedometer.
Faulty speed sensor/circuit	Repair the circuit or replace the speed sensor. Refer to the speed sensor DTCs.
Degraded fluid	Change the transmission fluid and filter. Refer to Automatic Transmission Fluid/Filter Replacement .
Loose speed sensor	Tighten the speed sensor retaining bracket bolt. Refer to Speed Sensor Replacement .
Incorrect fluid level	Correct the fluid level. Refer to Transmission Fluid Checking Procedure .
Shift adaptives not converged	Drive the vehicle until shift adaptives are converged.
Low main pressure	Repair the transmission.
Intermittent conditions	Inspect the wiring harnesses and connectors.
Loose or damaged speed gear	Tighten the output flange bolt or replace speed gear.
Sticking valves in control valve body	Overhaul the control valve body assembly.
Leaking trim solenoids	Repair or replace the trim solenoids.