Section 788 (Automatic Transmission - 4L80-E/4L85-E - Service, Diagnosis & Trouble Shooting)
WARNING: This page is about a different car, the 2006 GMC Yukon XL, 2006 Chevrolet Suburban, and 2006 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Symptoms - Automatic Transmission
- Range Selector Displays Incorrect Range
- Tow/Haul Switch/Indicator Always On or Inoperative
- Transmission Fluid Checking Procedure
- Line Pressure Check Procedure
- Road Test Procedure
- Torque Converter Diagnosis Procedure
- Flexplate/Torque Converter Vibration Test
- Noise and Vibration Analysis
- Clutch Plate Diagnosis
- Engine Coolant/Water in Transmission
- Fluid Leak Diagnosis
- Case Porosity Repair
- Shift Solenoid Leak Test
- Automatic Transmission Oil Cooler Flushing and Flow Test (J 35944-A)
- Automatic Transmission Oil Cooler Flushing and Flow Test (J 45096)
- Automatic Transmission Fluid Leaks
- High Line Pressure
- Forward Motion in Neutral
- Inadequate Lubrication at Low Line or Heavy Loads
- Inadequate Lubrication
- Engine Stall in Neutral
- Loss of Power
- No Torque in Reverse and Third
- Transmission Overheats
- Transmission Overheats at WOT
- Low Line Pressure
- Engine Starts in Gear
- Shift Lever Indicates Wrong Gear
- No Gear Selection
- Loss of Drive
- No Park
- Remains in Park
- Difficult to Shift Out of Park
- Does Not Stay in Park
- No Reverse
- No First Gear - D1
- No Second Gear - D1
- No Overrun Braking - D1
- No Engine Braking - D1
- No First Gear - D2
- No Second Gear - D2
- No Overrun Braking - D2
- No Engine Braking - D2
- No Second Gear Engine Braking - D2
- No First Gear - D3
- No Second Gear - D3
- No Third Gear - D3
- No Overrun Braking - D3
- No Engine Braking - D3
- No First Gear - D4
- First Gear Only - D4
- First and Second Gear Only - D4
- Second Gear Only - D4
- Second and Third Gear Only - D4
- First and Fourth Gear Only - D4
- Third and Fourth Gear Only - D4
- No Second Gear - D4
- No Third Gear - D4
- No Fourth Gear - D4
- No Torque Converter Clutch (TCC) Apply
- Soft Torque Converter Clutch (TCC) Apply
- Torque Converter Clutch (TCC) Slipping
- Torque Converter Clutch (TCC) Stuck On
- Incorrect Torque Converter Clutch (TCC) Apply or Release
- Converter Ballooning
- No Torque Multiplication
- Fluid Foaming
- Noise
- Engine Stall
- Vibration
- Oil Out the Vent Tube
- No Torque in Second Gear
- Second Gear Starts
- Third Gear Starts
- Fourth Gear Starts
- Erratic Shift Quality
- Transmission Slips
- Case Extension Bearing/Seal Failed
- Inaccurate Shift Points
- Harsh Shifts
- Harsh Shift D to R
- Harsh Shift 3 to 4
- Harsh Shift 4 to 3
- Harsh Shift D4 to D3, D2, or D1
- Soft Shifts
- Soft Shift into R
- Soft Shift R to D
- Soft Shift 2 to 1
- Soft Shift 2 to 3
- Soft Shift 3 to 2
- Soft Shift D3 to D2
- Delayed Shift 1 to 2
- No D2 to D1
- No D3 to D2