Symptoms - Automatic Transmission

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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 .
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 (6.6L) or Flexplate/Torque Converter Vibration Test (8.1L) .
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 (6.6L) or Flexplate/Torque Converter Vibration Test (8.1L) .