GM Service Manual Online
For 1990-2009 cars only

Diagnostic Category

Diagnostic Information

The following table consists of eight 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.

Fluid Diagnosis

This category contains the following topics:

    • Fluid condition, such as appearance, contaminants, smell, overheating
    • Line pressure, high or low
    • Fluid leaks

 

    • Refer to Transmission Fluid Check .
    • Refer to Transmission Overheats .
    • Refer to Line Pressure Instability .
    • Refer to Low Line Pressure .
    • Refer to High Line Pressure .
    • Refer to Automatic Transmission Fluid Leaks .
    • Refer to Fluid Leak Diagnosis .

Noise and Vibration Diagnosis

This category contains the following topics:

    • Noise, drive gear, final drive, whine, growl, rattle, buzz, popping
    • Vibration

 

    • Refer to Final Drive Noise or Hum Noise .
    • Refer to Noisy in Reverse Only .
    • Refer to Ratcheting Noise .
    • Refer to Gravel or Grating Noise .
    • Refer to Moaning Noise .
    • Refer to Rattle Noise .
    • Refer to Vibration .
    • Refer to Noise and Vibration Analysis .

Range Performance Diagnosis

This category contains the following topics:

    • No Drive/Slips in Drive
    • No Reverse/Slips in Reverse
    • No Drive and Reverse
    • No Park
    • Stays in Park
    • Stays in Drive
    • Stays in Low
    • Stays in Intermediate
    • Stays in Reverse
    • Range Selector Position Inaccurate

 

    • Refer to No Drive in Forward Ranges .
    • Refer to Slips in Drive .
    • Refer to No Reverse .
    • Refer to Slips in Reverse .
    • Refer to No Forward and Reverse .
    • Refer to No Park .
    • Refer to Stays in Drive .
    • Refer to Stays in Low .
    • Refer to Stays in Intermediate .
    • Refer to Stays in Reverse .
    • Refer to DTC P0705 .
    • Refer to DTC P1756 .
    • Refer to DTC P1758 .

Shift Quality Feel Diagnosis

This category contains the following topic:

Harsh Garage Shift

 

Refer to Harsh Garage Shift .

Driveability/Ratio Control Diagnosis

This category contains the following topic:

Poor driveability

 

Refer to Poor Driveablity - Poor or No Ratio Control .

Torque Converter Diagnosis

This category contains the following topics:

    • Torque converter diagnosis
    • TCC does not apply
    • TCC does not release
    • TCC apply/release quality
    • Poor acceleration/No torque multiplication

 

    • Refer to Torque Converter Diagnosis .
    • Refer to Torque Converter Clutch Stuck On .
    • Refer to Harsh Torque Converter Clutch Apply .
    • Refer to Torque Converter Clutch Slipping .

Indicator On or Message Center Displays Message

This category contains the following topics:

    • Message Center displays "Trans Hot"
    • Message Center displays "Trans Cold"

 

    • Refer to Transmission Fluid Check .
    • Refer to Transmission Overheats .
    • Refer to DTC P0218 .

Symptom Not Found or No Symptom Detected

    • Refer to Transmission Fluid Check .
    • Refer to Road Test .
    • Refer to Line Pressure Check .