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 459 (AUTOMATIC TRANSAXLE DIAGNOSIS, SERVICE & REPAIR - 4T65-E)
1999 GMC Forward Control 5.7 R, Automatic
Section 459 (Automatic Transaxle Diagnosis, Service & Repair - 4T65-E)
1999 GMC Forward Control 5.7 R, AutomaticSECTION Section 459 (Automatic Transaxle Diagnosis, Service & Repair - 4T65-E)
WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
- Specifications
- Schematic and Routing Diagrams
- Component Locator
- Diagnostic Information and Procedures
- Diagnostic Starting Point - Automatic Transmission
- Diagnostic System Check - Automatic Transmission (3.4L)
- Scan Tool Output Controls
- Transmission Scan Tool Data List
- Transmission Scan Tool Data Definitions
- Diagnostic Trouble Code (DTC) Type Definitions
- Diagnostic Trouble Code (DTC) List/Type
- DTC P0218: Transmission Fluid Temperature High
- DTC P0502: Low Vehicle Speed With A High Engine Speed While In A Drive Range
- DTC P0503: Large Change In Vehicle Speed In A Short Period Of Time
- DTC P0711: Intermittent Voltage Or No Voltage Change In TFT Sensor Circuit
- DTC P0712: Short To Ground In TFT Sensor Signal Circuit
- DTC P0713: Open Or A Short To Power On The TFT Sensor Circuit
- DTC P0716: Unrealistically Large Change In AT ISS Sensor High Signal In A Short Period Of Time
- DTC P0717: Low Input Speed While The Vehicle And Engine Speeds Are High
- DTC P0719: Open Brake Switch
- DTC P0724: Closed TCC Brake Switch
- DTC P0730: Incorrect Gear Ratio
- DTC P0741: High Torque Converter Slip
- DTC P0742: TCC Release Switch Is Closed When The TCC Is Commanded OFF
- DTC P0748: Duty Cycle Is Outside The Range Of 0.5-95%
- DTC P0751: Gear Ratio Mismatch
- DTC P0752: Gear Ratio Mismatch
- DTC P0753: PCM Solenoid Command Mismatch
- DTC P0756: Gear Ratio Mismatch
- DTC P0757: Gear Ratio Mismatch
- DTC P0758: PCM Solenoid Command Mismatch
- DTC P1811: Shift Timing
- DTC P1814: High Throttle Angle And Low Vehicle Speed
- DTC P1819: IMS Signals Invalid
- DTC P1820: IMS Signal A Is Always Low
- DTC P1822: IMS Signal B Is Always High
- DTC P1823: IMS Signal P Is Always Low
- DTC P1825: Invalid Transmission Range With The Engine Running
- DTC P1826: IMS Signal C Is High While The Vehicle Is Being Driven In A Forward Gear
- DTC P1860: PCM Detects A Voltage That Is Outside Of The Calibration Limits
- DTC P1887: TCC Not Applied When TCC Slip Speed Indicates TCC Is Applied
- Symptoms - Automatic Transmission
- Range Selector Displays Incorrect Range
- Transmission Fluid Checking Procedure
- Line Pressure Check Procedure
- Road Test Procedure
- Notes
- Electrical Function Check
- Upshift Control and Torque Converter Clutch (TCC) Apply
- Part Throttle Detent Downshift
- Full Throttle Detent Downshift
- Manual Downshifts
- Manual 4-3 Downshift
- Manual 4-2 Downshift
- Manual 4-1 Downshift
- Coasting Downshifts
- Manual Gear Range Selection
- Reverse
- Manual First
- Manual Second
- Manual Third
- Torque Converter Diagnosis Procedure
- Torque Converter Stator
- Flexplate/Torque Converter Vibration Test
- Noise and Vibration Analysis
- Clutch Plate Diagnosis
- Engine Coolant in Transmission
- Fluid Leak Diagnosis
- Case Porosity Repair
- Shift Solenoid Leak Test
- Automatic Transmission Oil Cooler
- Automatic Transmission Fluid Leaks
- Incorrect Line Pressure
- Delayed Park to Reverse/Drive Engagement
- Harsh Park to Reverse/Drive Engagement
- Slips in Drive or No Drive
- Slips in Reverse or No Reverse
- Locked Up in Drive/Reverse
- No Park Range
- Harsh or Soft 1-2 Shift Feel
- Harsh or Soft 2-3/3-2 Shift Feel
- Harsh or Soft 3-4/4-3 Shift Feel
- High or Low Upshift or Downshift Speed
- First and Second Gear Only (2-3 Solenoid Stuck On)
- First and Fourth Gear Only (1-2 Solenoid Stuck On)
- Second and Third Gear Only (1-2 Solenoid Stuck Off)
- Third and Fourth Gear Only (2-3 Solenoid Stuck Off)
- First Gear Only
- Second Gear Only
- Third Gear Only
- Fourth Gear Only
- Slipping or No First Gear
- Slipping or No Second Gear
- Slipping or No Third Gear
- Slipping or No Fourth Gear
- No Engine Braking in Manual Second or Low Range
- 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
- Noise in Random Ranges
- Abnormal Noise in Park or Neutral Range
- Converter Clutch Stuck On in All Gears
- Converter Clutch Stuck On in Second, Third and Fourth Gear
- Harsh Torque Converter Clutch (TCC) Apply or Release
- Converter Clutch Apply Rough, Slips or Shudders
- No Torque Converter Clutch (TCC) Apply
- Repair Instructions
- Case Porosity
- Automatic Transmission Range Selector Cable Replacement
- Automatic Transmission Range Selector Cable Adjustment
- Automatic Transmission Range Selector Cable Bracket Replacement
- Automatic Transmission Range Selector Cable Lever Replacement
- Shift Indicator Replacement
- Floor Shift Control Replacement
- Fluid Filler Tube Replacement
- Vehicle Speed Sensor (VSS) Replacement
- Reverse Servo Replacement
- Forward Servo Replacement (M15)
- Forward Servo Replacement (M76)
- Front Wheel Drive Shaft Oil Seal Replacement - Left
- Front Wheel Drive Shaft Oil Seal Replacement - Right
- Oil Pressure Test Plug Replacement
- Transmission Vent Replacement
- Oil Pan Replacement
- Oil Filter and Seal Replacement
- Accumulator & 2-1 Manual Servo Replacement
- Thermo Element Replacement
- Wiring Harness Replacement
- Case Side Cover Replacement
- Fluid Temperature Sensor Replacement
- Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid Replacement
- 1-2 Shift Solenoid Valve Replacement
- 2-3 Shift Solenoid Valve Replacement
- Input Speed Sensor Replacement
- Pressure Control Solenoid (PCS) Replacement
- Oil Pump Replacement
- Control Valve Body Replacement
- Oil Weir Replacement
- Case Extension Housing Replacement
- Final Drive Replacement
- Output Shaft Replacement
- Automatic Transmission Oil Cooler Hose Replacement
- Transmission Oil Cooler Line Quick Connect Fitting
- Automatic Transmission Oil Cooler Fitting Replacement
- Transmission Mount Inspection
- Automatic Transmission Mount Replacement
- Automatic Transmission Brace Replacement
- Automatic Transmission Mount Bracket Replacement
- Torque Converter Cover Replacement
- Flywheel to Torque Converter Bolt Replacement
- Transmission Replacement
- Description and Operation
- Transmission General Information
- Definitions and Abbreviations
- Transmission Abbreviations
- Transmission Identification Information
- Transmission General Description
- Transmission Component and System Description
- Transmission Adaptive Functions
- Electronic Component Description
- Automatic Transmission Input Shaft Speed Sensor
- Notes
- 1-2 and 2-3 Shift Solenoid Valves
- Pressure Control Solenoid Valve
- Torque Converter Clutch Pulse Width Modulation Solenoid Valve
- Automatic Transmission Fluid Pressure Manual Valve Position Switch
- Lever Assembly-Manual Shaft Detent with Internal Mode Switch
- Automatic Transmission Fluid Temperature Sensor
- Automatic Transmission in-line 20-Way Connector Description
- Special Tools & Equipment
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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.