Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 143 (AUTOMATIC TRANSAXLE DIAGNOSIS - 4T65-E)
1999 GMC Forward Control 5.7 R, Automatic
Section 143 (Automatic Transaxle Diagnosis - 4T65-E)
1999 GMC Forward Control 5.7 R, AutomaticSECTION Section 143 (Automatic Transaxle Diagnosis - 4T65-E)
WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
- Application
- Identification
- Description & Operation
- Notes
- Introduction
- Adapt Function
- Transaxle Components & Systems
- Electronic Components
- Notes
- Vehicle Speed Sensor
- Input Shaft Speed Sensor
- 1-2 & 2-3 Shift Solenoid Valves
- Pressure Control Solenoid Valve
- Torque Converter Clutch Pulse Width Modulation Solenoid Valve
- Transmission Fluid Pressure Manual Valve Position Switch
- Lever Assembly/Manual Shaft Detent With Internal Mode Switch
- Transmission Fluid Temperature Sensor
- Inline 20-Pin Connector
- Powertrain Control Module
- Limp-In Mode
- Electronic Control System
- Shift Interlock System
- Trouble Shooting
- Performance Tests
- Self-Diagnostic System
- Diagnostic Tests
- DTC P0218: Transaxle Fluid OVERTEMPERATURE
- DTC P0502: Vehicle Speed Sensor Circuit (Low Input)
- DTC P0503: Vehicle Speed Sensor Circuit Performance
- DTC P0711: Transmission Fluid Temperature Sensor Circuit Performance
- DTC P0712: Transmission Fluid Temperature Sensor Circuit (Low Input)
- DTC P0713: Transmission Fluid Temperature Sensor Circuit (High Input)
- DTC P0716: Input Speed Sensor Circuit Performance
- DTC P0717: Input Speed Sensor Circuit No Signal
- DTC P0719: TCC Brake Switch Circuit Low Input (Switch Stuck On)
- DTC P0724: TCC Brake Switch Circuit High Input (Switch Stuck Off)
- DTC P0730: Incorrect Gear Ratio
- DTC P0741: TCC System Stuck Off
- DTC P0742: TCC System Stuck On
- DTC P0748: Pressure Control Solenoid Electrical Problem
- DTC P0751: 1-2 Shift Solenoid Performance
- DTC P0752: 1-2 Shift Solenoid Performance
- DTC P0753: 1-2 Shift Solenoid Electrical Problem
- DTC P0756: 2-3 Shift Solenoid Performance
- DTC P0757: 2-3 Shift Solenoid Valve Performance
- DTC P0758: 2-3 Shift Solenoid Electrical Problem
- DTC P1811: Maximum Adapt & Long Shift
- DTC P1814: Torque Converter Overstress
- DTC P1819: Internal Mode Switch - No Start\Wrong Range
- DTC P1820: Internal Mode Switch Circuit A - Low
- DTC P1822: Internal Mode Switch Circuit B - High
- DTC P1823: Internal Mode Switch Circuit P - Low
- DTC P1825: Internal Mode Switch - Illegal Range
- DTC P1826: Internal Mode Switch Circuit C - High
- DTC P1860: TCC Pulse Width Modulated Solenoid Electrical Problem
- DTC P1887: Torque Converter Clutch Release Switch Circuit Malfunction
- Symptom Tests
- Component Tests
- Removal & Installation
- Notes
- Input Shaft Speed Sensor
- Parking System Components
- Powertrain Control Module
- Pressure Control Solenoid Valve
- STOPLAMP Switch
- Torque Converter Clutch Pulse Width Modulation Solenoid
- Transaxle Internal Wiring Harness
- Transmission Fluid Pressure Manual Valve Position Switch
- Transmission Fluid Temperature Sensor
- Vehicle Speed Sensor
- Torque Specifications
- Electronic Component Specifications
- Connector Identification
- Wiring Diagrams
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.