Symptoms - Automatic Transmission

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

Diagnostic Category	Diagnostic Information
The following table consists of nine 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 Checking . Refer to Fluid Foaming . Refer to Transmission Overheats . Refer to Transmission Overheats at WOT . Refer to High Line Pressure . Refer to Low Line Pressure . Refer to Inadequate Lubrication at Low Line or Heavy Loads . Refer to Inadequate Lubrication . Refer to Fluid Leak Diagnosis . Refer to Case Extension Bearing/Seal Failed . Refer to Oil Out the Vent Tube . Refer to Automatic Transmission Fluid Leaks .
Noise and Vibration Diagnosis: This category contains the following topics: Noise, drive gear, final drive, whine, growl, rattle, buzz, popping Vibration	Refer to Noise . Refer to Vibration . Refer to Flexplate/Torque Converter Vibration Test .
Range Performance Diagnosis: This category contains the following topics: Drives in Neutral No Park/Neutral No Reverse Engine stalling No Drive No engine braking No or incorrect gear selection Stuck in 4WD Low Shift selector indicator does not match transmission gear range	Refer to Forward Motion in Neutral . Refer to No Park . Refer to No Reverse . Refer to Engine Stall . Refer to No Torque in Reverse and Third . Refer to Loss of Power . Refer to No Torque in Second Gear . Refer to Loss of Drive . Refer to No Overrun Braking - D1 . Refer to No Engine Braking - D1 . Refer to No Overrun Braking - D2 . Refer to No Engine Braking - D2 . Refer to No Second Gear Engine Braking - D2 . Refer to No Overrun Braking - D3 . Refer to No Engine Braking - D3 . Refer to Engine Starts in Gear . Refer to Shift Lever Indicates Wrong Gear . Refer to No Gear Selection . Refer to Remains in Park . Refer to Difficult to Shift Out of Park . Refer to Does Not Stay in Park . Refer to Range Selector Displays Incorrect Range .
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 Erratic Shift Quality . Refer to Harsh Shifts . Refer to Transmission Slips . Refer to Harsh Shift 3 to 4 . Refer to Harsh Shift 4 to 3 . Refer to Harsh Shift D4 to D3, D2, or D1 . Refer to Soft Shifts . Refer to Delayed Shift 1 to 2 . Refer to Soft Shift 2 to 3 . Refer to Soft Shift D3 to D2 . Refer to Soft Shift 3 to 2 . Refer to No D3 to D2 . Refer to No D2 to D1 . Refer to Harsh Shift D to R . Refer to Soft Shift into R . Refer to Soft Shift R to D .
Shift Pattern: This category contains the following topics: One forward gear missing or slipping One forward gear only Two forward gears only Non-First gear start Extended shift pattern Erratic shift pattern	Refer to No First Gear - D1 . Refer to No First Gear - D2 . Refer to No First Gear - D4 . Refer to No Second Gear - D1 . Refer to No Second Gear - D2 . Refer to No Second Gear - D4 . Refer to No Second Gear - D3 . Refer to No Third Gear - D3 . Refer to No Third Gear - D4 . Refer to No Fourth Gear - D4 . Refer to First Gear Only - D4 . Refer to Second Gear Only - D4 . Refer to First and Second Gear Only - D4 . Refer to First and Fourth Gear Only - D4 . Refer to Second and Third Gear Only - D4 . Refer to Third and Fourth Gear Only - D4 . Refer to Second Gear Starts . Refer to Third Gear Starts . Refer to Fourth Gear Starts . Refer to Tow/Haul Switch/Indicator Always On or Inoperative .
Shift Speed Diagnosis: This category contains the following topics: Inaccurate or inconsistent shift points Extended shift pattern Erratic shift pattern	Refer to Inaccurate Shift Points . Refer to Tow/Haul Switch/Indicator Always On or Inoperative .
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 Converter Ballooning Engine Stall	Refer to Torque Converter Diagnosis . Refer to Flexplate/Torque Converter Vibration Test . Refer to No Torque Converter Clutch Apply . Refer to Torque Converter Clutch Stuck On . Refer to Soft Torque Converter Clutch Apply . Refer to Incorrect Torque Converter Clutch Apply or Release . Refer to No Torque Multiplication . Refer to Torque Converter Clutch Slipping . Refer to Converter Ballooning . Refer to Engine Stall in Neutral .
Indicator On or Message Center Displays Message: This category contains the following topics: 4WD light does not illuminate Tow/haul light does not illuminate Message Center displays "Transmission Hot" Message Center displays "Trans Hot...Idle Engine" Message Center displays "Service Brake System"	Refer to Tow/Haul Switch/Indicator Always On or Inoperative . Refer to Transmission Fluid Checking . Refer to Fluid Foaming . Refer to Transmission Overheats . Refer to Transmission Overheats at WOT . Refer to DTC P0719 , short to GND.
Symptom not found or no symptom detected	Refer to Transmission Fluid Checking . Refer to Road Test . Refer to Line Pressure Check .