GM Service Manual Online
For 1990-2009 cars only
Makes
🢒
GMC_Truck
🢒
1999
🢒
GMC C Pickup - 2WD
🢒
Transmission/Transaxle
🢒 Automatic Transmission - 4L80-E
Transmission/Transaxle
All Component Locator
Automatic Transmission Components
Automatic Transmission Electronic Component Views
Transmission Component Location
All Description and Operation
Electronic Component Description
All Special Tools and Equipment
Special Tools
All Visual Identification
Automatic Transmission Inline Harness Connector End View
Automatic Transmission Internal Connector End Views
Electrical Connector
Transmission Identification Information
Cleaning, Inspection, and Adjustment
Park/Neutral Position Switch Adjustment
Shift Cable Adjustment
Diagnostic Procedures
Automatic Transmission Fluid Leaks
Case Extension Bearing/Seal Failed
Case Porosity Repair
Converter Ballooning
Delayed Shift 1 to 2
Difficult to Shift Out of Park
Does Not Stay in Park
Engine Stall
Engine Stall in Neutral
Engine Starts in Gear
Erratic Shift Quality
First and Fourth Gear Only - D4
First and Second Gear Only - D4
First Gear Only - D4
Fluid Foaming
Forward Motion in Neutral
Fourth Gear Starts
Harsh Shift 3 to 4
Harsh Shift 4 to 3
Harsh Shift D to R
Harsh Shift D4 to D3, D2, or D1
Harsh Shifts
High Line Pressure
Inaccurate Shift Points
Inadequate Lubrication
Inadequate Lubrication at Low Line or Heavy Loads
Incorrect Torque Converter Clutch Apply or Release
Loss of Drive
Loss of Power
Low Line Pressure
No D2 to D1
No D3 to D2
No Engine Braking - D1
No Engine Braking - D2
No Engine Braking - D3
No First Gear - D1
No First Gear - D2
No First Gear - D3
No First Gear - D4
No Fourth Gear - D4
No Gear Selection
No Overrun Braking - D1
No Overrun Braking - D2
No Overrun Braking - D3
No Park
No Reverse
No Second Gear - D1
No Second Gear - D2
No Second Gear - D3
No Second Gear - D4
No Second Gear Engine Braking - D2
No Third Gear - D3
No Third Gear - D4
No Torque Converter Clutch Apply
No Torque in Reverse and Third
No Torque in Second Gear
No Torque Multiplication
Noise
Oil Out the Vent Tube
Remains in Park
Second and Third Gear Only - D4
Second Gear Only - D4
Second Gear Starts
Shift Lever Indicates Wrong Gear
Shift Solenoid Leak Test
Soft Shift 2 to 1
Soft Shift 2 to 3
Soft Shift 3 to 2
Soft Shift D3 to D2
Soft Shift into R
Soft Shift R to D
Soft Shifts
Soft Torque Converter Clutch Apply
Symptom Diagnosis
Third and Fourth Gear Only - D4
Third Gear Starts
Torque Converter Clutch Slipping
Torque Converter Clutch Stuck On
Transmission Fluid Cooler Flushing and Flow Test
Transmission Overheats
Transmission Overheats at WOT
Transmission Slips
Vibration
Diagnostic Trouble Codes
DTC P0218 Transmission Fluid Overtemperature
DTC P0502 Vehicle Speed Sensor (VSS) Circuit Low Input
DTC P0503 Vehicle Speed Sensor (VSS) Circuit Intermittent
DTC P0560 System Voltage High/Low
DTC P0711 TFT Sensor Circuit Range/Performance
DTC P0712 Transmission Fluid Temperature (TFT) Sensor Circuit Low Input
DTC P0713 Transmission Fluid Temperature (TFT) Sensor Circuit High Input
DTC P0716 Input Speed Sensor Circuit Intermittent
DTC P0717 Input Speed Sensor Circuit Low Input
DTC P0719 Brake Switch Circuit Low Input
DTC P0722 Output Speed Sensor Circuit Low Input
DTC P0723 Output Speed Sensor Circuit Intermittent
DTC P0724 Brake Switch Circuit High Input
DTC P0730 Incorrect Gear Ratio
DTC P0731 Incorrect 1st Gear Ratio
DTC P0732 Incorrect 2nd Gear Ratio
DTC P0733 Incorrect 3rd Gear Ratio
DTC P0734 Incorrect 4th Gear Ratio
DTC P0741 TCC System Stuck Off
DTC P0742 TCC System Stuck On
DTC P0748 Pressure Control Solenoid Circuit Electrical
DTC P0751 1-2 Shift Solenoid Valve Performance
DTC P0751 1-2 Shift Solenoid Valve Stuck Off
DTC P0752 1-2 Shift Solenoid Valve Stuck On
DTC P0753 1-2 Shift Solenoid Circuit Electrical
DTC P0756 2-3 Shift Solenoid Valve Performance
DTC P0756 2-3 Shift Solenoid Valve Stuck On
DTC P0757 2-3 Shift Solenoid Valve Stuck Off
DTC P0758 2-3 Shift Solenoid Circuit Electrical
DTC P1810 TFP Valve Position Switch Circuit
DTC P1810 TFP Valve Position Switch Invalid Range
DTC P1860 TCC PWM Solenoid Circuit Electrical
DTC P1870 Transmission Component Slipping
DTC P1875 4WD Low Switch Circuit Electrical
Electrical/Electronic Schematic Diagrams
Automatic Transmission Controls Schematics
Automatic Transmission Schematic Icons
Automatic Transmission Schematic References
Electrical/Electronic Specifications
Temperature Versus Resistance
General Diagnostic Information
Automatic Transmission Wiring Harness Check
Clutch Plate Diagnosis
Engine Coolant/Water in Transmission
Flex Plate/Torque Converter Vibration Test
Fluid Leak Diagnosis
Functional Test
Line Pressure Check
Noise and Vibration Analysis
Road Test
Torque Converter Diagnosis
Transmission Fluid Check
Transmission Fluid Pressure Manual Valve Position Switch Resistance Check
General Information
Adapt Function
Definitions and Abbreviations
Transmission Component and System Description
Transmission General Description
Transmission General Information
Mechanical Specifications
Fastener Tightening Specifications
Range Reference
Shift Solenoid Valve State and Gear Ratio
Other Specifications
Component Resistance
Diagnostic Trouble Code Identification
Fluid Capacity Specifications
Line Pressure
Range Signal
Scan Tool Data Definitions
Shift Speed
Transmission General Specifications
Transmission Scan Tool Data Values
Removal, Installation, and Replacement
Accumulator Housing Replacement
Automatic Transmission Fluid and Filter Replacement
Control Valve Body Replacement
Forward Servo Replacement
Oil Cooler Hose/Pipe Replacement
Park Pawl and Actuator Replacement
Park/Neutral Position Switch Replacement
Pressure Regulator Valve Replacement
Reverse Servo Replacement
Shift Cable Replacement
Torque Converter Clutch Valve and Spring Replacement
Transmission Fluid Auxiliary Cooler Replacement
Transmission Fluid Filler Tube and Seal Replacement
Transmission Heat Shield Replacement
Transmission Replacement
Transmission Vent Hose Replacement
Vehicle Speed Sensor Replacement