Section 72 (Automatic Transaxle - 4T80-E - Service, Diagnosis & Troubleshooting)
WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
- Symptoms - Automatic Transmission
- Range Selector Displays Incorrect Range
- Transmission Fluid Checking
- Line Pressure Check
- Road Test
- Torque Converter Diagnosis
- Flexplate/Torque Converter Vibration Test
- Noise and Vibration Analysis
- Clutch Plate Diagnosis
- Engine Coolant/Water in Transmission
- Fluid Leak Diagnosis
- Case Porosity Repair
- Line Pressure Adapter and Gage Installation
- Shift Solenoid Leak Test
- Automatic Transmission Oil Cooler Flushing and Flow Test (J 45096)
- Automatic Transmission Oil Cooler Flushing and Flow Test (J 35944-A)
- Bushing and Mating Shaft Inspection
- Automatic Transmission Fluid Leaks
- Harsh Shifts
- Low Line Pressure
- Second Gear Starts
- Transmission Slips in Reverse
- Soft Shifts
- No First Gear D2, D3, D4
- No Second Gear D2, D3
- No Third Gear - D3
- No Fourth Gear
- No First Gear
- Inconsistent Shifts
- Third and Fourth Gears Only
- No Engine Braking
- No Overrun Braking in D3
- No Overrun Braking in D2
- No Engine Braking in D1
- Forward Motion in N
- Engine Stall
- Loss of Power
- Loss of Drive
- Engine Starts in Gear
- No Gear Selection
- Shift Lever Indicates Wrong Gear
- No Torque Converter Clutch Apply
- Soft Torque Converter Clutch Apply
- Early Torque Converter Clutch Engagement
- Torque Converter Clutch Not Disengaging
- Converter Ballooning
- No Torque Multiplication
- No Reverse
- Does Not Stay in Park
- Extended or Delayed Upshifts
- Delayed Park to Reverse/Drive Engagement
- Noise in All Ranges
- Whine Noise Varying with RPM or Fluid Pressure
- Popping Noise
- Buzz Noise or High Frequency Rattle Sound
- Whine/Growl Noise That Changes with Vehicle Speed
- Final Drive Noise or Hum Noise
- Noise in First, Second, Third, or Fourth
- Vibration Diagnosis
- Fluid Foaming