Symptoms - Automatic Transmission. Buick Lucerne 2007

For 1990-2009 cars only

Makes 🢒 Buick 🢒 2007 🢒 Lucerne 🢒 General Information 🢒 Vibration Diagnosis and Correction 🢒 Symptoms - Automatic Transmission

Diagnostic Category

Diagnostic Information

DEFINITION: This 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 - appearance, contaminants, smell, overheating

•	Line pressure - high or low

•	Fluid leaks

•	Refer to Transmission Fluid Check .

•	Refer to Incorrect 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, hum, rattle, buzz, popping

•	Torque converter diagnosis

•	Noise and vibration analysis

•	Refer to Whine Noise Varying with RPM or Fluid Pressure .

•	Refer to Popping Noise .

•	Refer to Buzz Noise or High Frequency Rattle Sound .

•	Refer to Whine/Growl Noise That Changes with Vehicle Speed .

•	Refer to Final Drive Noise or Hum Noise .

•	Refer to Noise in First, Second, Third, or Fourth .

•	Refer to Noise in Random Ranges .

•	Refer to Abnormal Noise in Park or Neutral Range .

•	Refer to Torque Converter Diagnosis .

•	Refer to Noise and Vibration Analysis .

Range Performance Diagnosis

This category contains the following topics:

•

No Park

•	No Reverse or slips

•	No Drive or slips

•	No engine braking

•	Range selector displays incorrect range

•	Refer to No Park Range .

•	Refer to Slips in Reverse or No Reverse .

•	Refer to Slips in Drive or No Drive .

•	Refer to Locked Up in Drive/Reverse .

•	Refer to No Engine Braking in Manual Ranges .

•	Refer to Range Selector Displays Incorrect Range .

Shift Quality (Feel) Diagnosis

This category contains the following topics:

•	Harsh shifts

•	Soft shifts

•	Harsh engagement, garage shifts

•	Delayed engagement, garage shifts

•	Refer to Harsh or Soft 1-2 Shift Feel .

•	Refer to Harsh or Soft 2-3/3-2 Shift Feel .

•	Refer to Harsh or Soft 3-4/4-3 Shift Feel .

•	Refer to Harsh Park to Reverse/Drive Engagement .

•	Refer to Delayed Park to Reverse/Drive Engagement .

Slipping or Missing Gears

This category contains the following topics:

•	No upshift

•	Slipping or missing gears

•	One forward gear only

•	Two forward gears only

•	Non-First gear start

•	Refer to Slipping or No First Gear .

•	Refer to Slipping or No Second Gear .

•	Refer to Slipping or No Third Gear .

•	Refer to Slipping or No Fourth Gear .

•	Refer to First Gear Only .

•	Refer to Second Gear Only .

•	Refer to Third Gear Only .

•	Refer to Fourth Gear Only .

•	Refer to First and Second Gear Only - 2-3 Solenoid Stuck On .

•	Refer to First and Fourth Gear Only - 1-2 Solenoid Stuck On .

•	Refer to Second and Third Gear Only (1-2 Solenoid Stuck Off) .

•	Refer to Third and Fourth Gear Only (2-3 Solenoid Stuck Off) .

Shift Speed Diagnosis

This category contains the following topic:

Incorrect shift points

Refer to High or Low Upshift or Downshift Speed .

Torque Converter Diagnosis

This category contains the following topics:

•	Torque converter diagnosis

•	TCC does not apply

•	TCC does not release

•	TCC shudder

•	Refer to Torque Converter Diagnosis .

•	Refer to No Torque Converter Clutch Apply .

•	Refer to Converter Clutch Stuck On in All Gears .

•	Refer to Converter Clutch Stuck On in Second, Third and Fourth Gear .

•	Refer to Harsh Torque Converter Clutch Apply or Release .

•	Refer to Converter Clutch Apply Rough, Slips, or Shudders .

Symptom Can Not Be Duplicated or Symptom Not Found

This category contains the following topics:

•	Transmission fluid diagnosis

•	Road testing

•	Line pressure diagnosis

•	Refer to Transmission Fluid Check .

•	Refer to Road Test .

•	Refer to Line Pressure Check .