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 MANUALSCHEVROLET1997FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANSAUTOMATIC TRANSMISSION DIAGNOSIS - 4L80-E (GASOLINE - 4 DIGIT CODES)
1997 Chevrolet Forward Control 5.7 R, Automatic
Automatic Transmission Diagnosis - 4L80-E (Gasoline - 4 Digit Codes)
1997 Chevrolet Forward Control 5.7 R, AutomaticSECTION Automatic Transmission Diagnosis - 4L80-E (Gasoline - 4 Digit Codes)
- Clutch & Band Application
- Technical Service Bulletins
- Description
- Operation
- Component Description
- Self-Diagnostics
- Notes
- Using Diagnostic Tests & Wiring Diagrams
- On-Board Diagnostic (OBD) System Check
- Retrieving Codes
- Clearing Trouble Codes
- Hard Or Intermittent Trouble Code Determination
- Trouble Code Definitions
- Diagnostic Tests
- DTC P0218: Transmission Fluid OVERTEMPERATURE
- DTC P0502: Output Shaft Speed (OSS) Sensor Circuit Low Input
- DTC P0503: Output Shaft Speed (OSS) Sensor Circuit
- DTC P0560: System Voltage Malfunction
- DTC P0711: Trans. Fluid Temperature (TFT) Sensor Circuit
- DTC P0712: Trans. Fluid Temperature (TFT) Sensor Circuit Low
- DTC P0713: Trans. Fluid Temperature (TFT) Sensor Circuit High
- DTC P0716: Input Speed Sensor Circuit Range/Performance
- DTC P0717: Input Speed Sensor Circuit No Signal
- DTC P0719: Brake Switch Circuit Low Input
- DTC P0724: Brake Switch Circuit High Input
- DTC P0730: Undefined Gear Ratio
- DTC P0741: Torque Converter Clutch (TCC) Circuit Inoperative
- DTC P0742: Torque Converter Clutch (TCC) Circuit Inoperative
- DTC P0748: Pressure Control Solenoid (PCS) Electrical
- DTC P0751: 1-2 Shift Solenoid ("A") Performance Malfunction
- DTC P0753: 1-2 Shift Solenoid ("A") Electrical Malfunction
- DTC P0756: 2-3 Shift Solenoid ("B") Performance Malfunction
- DTC P0758: 2-3 Shift Solenoid ("B") Electrical Malfunction
- DTC P1810: Transmission Fluid Pressure (TFP) Position Switch
- DTC P1860: TCC Pulse Width Modulated (PWM) Solenoid
- DTC P1870: Transmission Component Slipping
- DTC P1875: 4WD Low Circuit Malfunction
- Component Tests
- 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.