Symptoms - Automatic Transmission

WARNING: This page is about a different car, the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Symptom Diagnosis

Diagnostic Category	Diagnostic Information
DEFINITION: This table consists of 9 diagnostic categories that are located in the left 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 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 Checking . Refer to Oil Pressure High or Low . Refer to Fluid Leak Diagnosis . Refer to Oil Out the Vent .
Noise and Vibration Diagnosis: This category contains the following topics: Ratcheting noise Noise: drive gear, final drive, whine, growl, rattle, buzz, popping Vibration	Refer to Ratcheting Noise . Refer to Vibration in Reverse and Whining Noise in Park . Refer to Popping Noise . Refer to Whine Noise Varying with RPM or Fluid Pressure . Refer to Buzz Noise or High Frequency Rattle Sound . Refer to Noise in Random Ranges .
Range Performance Diagnosis: This category contains the following topics: Drives in Neutral No Park No Reverse No Drive No engine braking Shift selector indicator does not match transmission gear range Lack of power or hesitation	Refer to Drives in Neutral . Refer to No Park . Refer to No Reverse or Slips in Reverse . Refer to No Drive in All Ranges . Refer to No Drive in Drive Range . Refer to No Overrun Braking - Manual 3-2-1 . Refer to Range Selector Displays Incorrect Range . Refer to Lack of Power or Hesitation .
Shift Quality (Feel) Diagnosis: This category contains the following topic: Harsh, soft or slipping shifts Harsh, soft or delayed engagement Shift shudder, flare or tie-up	Refer to Harsh Shifts . Refer to Slipping or Harsh 1-2 Shift . Refer to No 2-3 Shift or 2-3 Shift Slips, Rough or Hunting . Refer to No 3-4 Shift, Slips or Rough 3-4 Shift . Refer to Harsh Garage Shift . Refer to Delay in Drive and Reverse . Refer to 3-2 Flare or Tie-Up .
Shift Pattern: This category contains the following topics: One forward gear only Two forward gears only Gear missing or slipping No upshift or slipping upshift No downshifts Non-First gear start	Refer to First Gear Range Only - No Upshift . Refer to Third Gear Only . Refer to Second/Third Gear Only or First/Fourth Gears Only . Refer to Slips in First Gear . Refer to Slipping or Harsh 1-2 Shift . Refer to No 2-3 Shift or 2-3 Shift Slips, Rough or Hunting . Refer to No 3-4 Shift, Slips or Rough 3-4 Shift . Refer to No Part Throttle or Delayed Downshifts . Refer to Second Gear Start .
Shift Speed Diagnosis: This category contains the following topic: Inaccurate or inconsistent shift points	Refer to Inaccurate Shift Points .
Torque Converter Diagnosis: This category contains the following topics: Torque converter diagnosis TCC does not apply TCC does not release TCC apply/release quality	Refer to Torque Converter Diagnosis . Refer to No Torque Converter Clutch Apply (300 RPM Slip) . Refer to No Torque Converter Clutch Release . Refer to Torque Converter Clutch Shudder .
Indicator On or Message Center Displays Message: This category contains the following topics: Message Center displays "change trans fluid"	Refer to Transmission Component and System Description .
If symptom is not found	Refer to Transmission Fluid Checking . Refer to Road Test . Refer to Line Pressure Check .