Symptoms - Automatic Transmission

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.

The following table consists of six diagnostic categories that are located in the left-hand column. Using this column, choose the appropriate category based on the operating conditions of the vehicle or transmission. After selecting a category, use the right-hand column to locate the specific symptom diagnostic information.

Diagnostic Category	Diagnostic Information
IMPORTANT: The Functional Test Procedure should be performed before beginning any diagnosis. If this procedure has not already been performed, refer to Functional Test Procedure (Diagnostic Information and Procedures) .
Fluid Diagnosis: This category contains the following topics: Fluid condition - appearance, contaminants, smell, overheating Line pressure - high or low Low lubrication pressure Fluid leaks	Refer to Transmission Fluid Checking Procedure . Refer to Transmission Overheats . Refer to Low Main Line Pressure in All Ranges . Refer to Low Main Line Pressure in specific Ranges, Normal Pressure in Other Ranges . Refer to Low Lubrication Pressure . Refer to Fluid Leak Diagnosis . Refer to Fluid Leaks from Fluid Fill Tube and/or Vent . Refer to Fluid Leaks from Transmission Input . Refer to Fluid Leaks from Transmission Output . Refer to Contaminated Transmission Fluid . Refer to Intermittent Buzzing Noise .
Noise and Vibration Diagnosis: This category contains the following topics: Noise - drive gear, final drive, whine, growl, rattle, buzz, popping Vibration	Refer to Noise and Vibration Analysis . Refer to Flexplate/Torque Converter Vibration Test (8.1L) Flexplate/Torque Converter Vibration Test (6.6L) .
Range Performance Diagnosis: This category contains the following topics: Drives in Neutral Excessive creep Will not shift to Forward or Reverse Will not stay in Forward or Reverse Will not make a specific shift	Refer to Abnormal Activities or Responses . Refer to Transmission Will Not Shift to Forward or Reverse . Refer to Transmission Will Not Stay in Forward or Reverse . Refer to Transmission Will Not Make a Specific Shift .
Shift Quality - Feel Diagnosis: This category contains the following topics: Erratic shifts Harsh, soft, delayed or slipping shifts Harsh, soft, or delayed engagement	Refer to Transmission Does Not Shift Properly . Refer to Excessive Slippage and Clutch Chatter . Refer to Excessive Flare - Engine Overspeed on Wide-Open Throttle .
Shift Speed Diagnosis: This category contains the following topic: Inaccurate or inconsistent shift points	Refer to Transmission Does Not Shift Properly .
Torque Converter Diagnosis: This category contains the following topics: Poor performance Noise during converter operation TCC shudder Shudder after TCC apply Vibration during converter operation	Refer to Torque Converter Diagnosis Procedure . Refer to Flexplate/Torque Converter Vibration Test (8.1L) Flexplate/Torque Converter Vibration Test (6.6L) .