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 MANUALSSATURN2003ION 3 4D SEDAN, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 5 (AUTOMATIC TRANSMISSION - VT25-E)
2003 Saturn Ion 3 4D Sedan, Standard
Section 5 (Automatic Transmission - VT25-E)
2003 Saturn Ion 3 4D Sedan, StandardSECTION Section 5 (Automatic Transmission - VT25-E)
WARNING: This page is about a different variant/trim than selected.
- Specifications
- Transmission Fluid Temperature (TFT) Sensor Specifications
- Fastener Tightening Specifications
- Sealers, Adhesives, and Lubricants
- Transmission General Specifications
- Fluid Capacity Specifications
- End Play Specifications
- Forward Clutch Backing Plate Specifications
- Reverse Clutch Backing Plate Specifications (Flat Clutch Plate Design - I.D. Spline)
- Reverse Clutch Backing Plate Specifications (Wave Clutch Plate Design - I.D. Spline)
- Range Reference
- Ratio vs Speed
- Transmission Range Switch Logic
- Line Pressure
- Component Resistance
- Schematic and Routing Diagrams
- Component Locator
- Diagnostic Information and Procedures
- Diagnostic Starting Point - Automatic Transmission
- Diagnostic System Check - Automatic Transmission
- 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 Overtemperature
- DTC P0562: System Voltage Low
- DTC P0563: System Voltage High
- DTC P0601: Control Module Read Only Memory (ROM)
- DTC P0602: ECM Not Programmed
- DTC P0603: ECM Long Term Memory Reset
- DTC P0604: Transmission Control Module (TCM) Random Access Memory (RAM)
- DTC P0606: ECM Internal Performance
- DTC P0705: Transmission Range Switch Circuit
- DTC P0711: Transmission Fluid Temperature (TFT) Sensor Performance
- DTC P0712: Transmission Fluid Temperature (TFT) Sensor Circuit Low Voltage
- DTC P0713: Transmission Fluid Temperature (TFT) Sensor Circuit High Voltage
- DTC P0716: Input Speed Sensor Performance
- DTC P0717: Input Speed Sensor Circuit Low Voltage
- DTC P0719: Brake Switch Circuit Low Voltage
- DTC P0722: Output Speed Sensor Circuit Low Voltage
- DTC P0723: Output Speed Sensor Circuit Intermittent
- DTC P0724: Brake Switch Circuit High Voltage
- DTC P0727: Engine Speed-No Signal
- DTC P0741: Torque Converter Clutch (TCC) System-Stuck Off
- DTC P0742: Torque Converter Clutch (TCC) System-Stuck On
- DTC P0841: Transmission Fluid Pressure (TFP) Sensor Performance
- DTC P0842: Transmission Fluid Pressure (TFP) Sensor Circuit Low Voltage
- DTC P0843: Transmission Fluid Pressure (TFP) Sensor Circuit High Voltage
- DTC P0960: Line Pressure Control (PC) Solenoid Control Circuit Open
- DTC P0961: Line Pressure Control (PC) Solenoid System Performance
- DTC P0962: Line Pressure Control (PC) Solenoid Control Circuit Low Voltage
- DTC P0964: Torque Converter Clutch (TCC) Pressure Control (PC) Solenoid Control Circuit Open
- DTC P0965: Torque Converter Clutch (TCC) Pressure Control (PC) Solenoid System Performance
- DTC P0966: Torque Converter Clutch (TCC) Pressure Control (PC) Solenoid Control Circuit Low Voltage
- DTC P1756: Transmission Range (TR) Switch Indicates Park/Neutral (P/N) With Drive Ratio
- DTC P1758: Transmission Range (TR) Switch Indicates Drive Without Drive Ratio
- DTC P1779: Torque Delivered Signal
- DTC P1882: Ratio Control Performance
- DTC P1883: Ratio Control Motor Coil A1 Control Circuit
- DTC P1884: Ratio Control Motor Coil A2 Control Circuit
- DTC P1885: Ratio Control Motor Coil B1 Control Circuit
- DTC P1886: Ratio Control Motor Coil B2 Control Circuit
- DTC P1888: Torque Converter Clutch (TCC) Enable Solenoid Control Circuit Low Voltage
- DTC P1889: Torque Converter Clutch (TCC) Enable Solenoid Control Circuit High Voltage
- Symptoms - Automatic Transmission
- Clearing Transmission Diagnostic Trouble Codes
- 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 in Transmission
- Fluid Leak Diagnosis
- Case Porosity Repair
- Transmission Overheats
- Line Pressure Instability
- Low Line Pressure
- High Line Pressure
- Automatic Transmission Fluid Leaks
- Final Drive Noise or Hum Noise
- Whine/Growl Noise That Changes with Vehicle Speed
- Noisy in Reverse Only
- Ratcheting Noise
- Whine Noise Varying with RPM or Fluid Pressure
- Gravel or Grating Noise
- Moaning Noise
- Clunk on Acceleration or Deceleration
- Rattle Noise
- Vibration
- No Drive in Forward Ranges
- Slips in Drive
- No Reverse
- Slips in Reverse
- No Forward and Reverse
- No Low or Reverse
- No Park
- Transmission Does Not Shift Out of Park
- Stays in Drive
- Stays in Low
- Stays in Intermediate
- Stays in Reverse
- Range Selector Displays Incorrect Range
- Harsh Garage Shift
- Poor Driveablity - Poor or No Ratio Control
- No Torque Converter Clutch (TCC) Apply/TCC Slipping/Soft TCC Apply
- Torque Converter Clutch (TCC) Stuck On
- Harsh Torque Converter Clutch (TCC) Apply
- Torque Converter Clutch (TCC) Slipping
- Repair Instructions
- Transmission Fluid Replacement
- Shift Control Replacement
- Shift Cable Replacement
- Shift Cable Adjustment
- Transmission Control Module Replacement
- Transmission Control Module Reprogramming Procedures
- Park/Neutral Position Switch Replacement
- Park/Neutral Position Switch Adjustment
- Variable Driven Cover Replacement
- Variable Drive Cover Replacement
- Input and Output Speed Sensor Assembly Replacement
- Control Valve Body Cover Replacement
- Control Valve Body Replacement
- Oil Pressure Test Plug Replacement
- Oil Cooler Line Replacement
- Oil Cooler Pipe Seals Replacement
- Automatic Transmission Oil Cooler Flushing
- Drive Axle Shaft Seal Replacement
- Transmission Mount Inspection
- Transmission Mount Replacement - Front
- Transmission Mount Replacement - Rear
- Transmission Mount Bracket Replacement - Rear
- Transmission Mount Replacement - Side
- Transmission Replacement
- Torque Converter Assembly Removal
- Torque Converter and Differential Housing Seal Replacement
- Park/Neutral Position Switch Removal
- Control Valve Body Cover Removal
- Control Valve Body Assembly Removal
- Input and Output Speed Sensor Assembly Removal
- Case Cover Assembly Removal
- Case Cover Assembly Disassemble
- Drive Belt Removal
- Reverse Clutch Removal
- Torque Converter and Differential Housing Removal
- Front Differential Transfer Gear Removal
- Front Differential Carrier Removal
- Drive Sprocket, Driven Sprocket, and Drive Link Removal
- Fluid Filter Removal
- Fluid Pump Removal
- Manual Shift Shaft and Parking System Components Removal
- Stator Shaft Seal Removal
- Transmission Cooler Line Seals Removal
- Transmission Case Inspection
- Torque Converter and Differential Housing Inspection
- Transmission Cooler Line Seals Installation
- Stator Shaft Seal Installation
- Manual Shift Shaft and Parking System Components Installation
- Fluid Pump Disassemble
- Fluid Pump Assemble
- Fluid Pump Installation
- Fluid Filter Installation
- Drive Sprocket, Driven Sprocket, and Drive Link Installation
- Front Differential Carrier Disassemble
- Front Differential Carrier Assemble
- Front Differential Carrier Bearing and Cup Replacement
- Front Differential Carrier Installation
- Front Differential Transfer Gear Bearing and Cup Replacement
- Front Differential Transfer Gear Installation
- Front Wheel Drive Shaft Oil Seal Removal
- Variable Driven Pulley Bearing Replacement
- Front Wheel Drive Shaft Oil Seal Installation
- Torque Converter and Differential Housing Installation
- Reverse Clutch Installation
- Forward Clutch Assembly Disassemble
- Input Shaft Carrier Pinion End Play Measurement
- Forward Clutch Assembly Assemble
- Drive Belt Installation
- Case Cover Assembly Assemble
- Case Cover Assembly Installation
- Control Valve Body Assembly Disassemble
- Control Valve Body Assembly Assemble
- Input and Output Speed Sensor Assembly Installation
- Control Valve Body Assembly Installation
- Control Valve Body Cover Installation
- Park/Neutral Position Switch Installation
- Torque Converter End Play Inspection
- Torque Converter Assembly Installation
- Description and Operation
- Park - Engine Running
- Reverse
- Neutral - Engine Running
- Drive, Intermediate and Low Range - TCC Released
- Drive, Intermediate and Low Range - TCC Applied
- Fluid Passages
- Transmission General Information
- Definitions and Abbreviations
- Transmission Identification Information
- Transmission General Description
- Transmission Component and System Description
- Transmission Adaptive Functions
- Electronic Component Description
- Transmission Control Module (TCM)
- TCM Programming Procedures
- Park/Neutral Position Switch Assembly
- Module Leadframe
- Automatic Transmission Input and Output (Shaft) Speed Sensor Assembly
- Input (Shaft) Speed (ISS) Sensor
- Output Speed Sensor (OSS)
- Transmission Fluid Pressure Sensor
- Transmission Fluid Temperature - TFT - Sensor
- Ratio Control Motor (RCM)
- Line Pressure Control Solenoid Valve
- TCC Pressure Control Solenoid Valve
- TCC Enable Solenoid Valve
- Special Tools and 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.