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 MANUALSCHEVROLET1995FORWARD CONTROL 4.3 Z, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANSAUTOMATIC TRANSMISSION DIAGNOSIS - 4L80-E
1995 Chevrolet Forward Control 4.3 Z, Automatic
Automatic Transmission Diagnosis - 4L80-E
1995 Chevrolet Forward Control 4.3 Z, AutomaticSECTION Automatic Transmission Diagnosis - 4L80-E
- Application
- Description
- Operation
- Trouble Shooting
- Electronic Self-Diagnostics
- Diagnostic Charts
- Diagnostic Charts - Gasoline
- DTC 14, Coolant Temperature Sensor Signal Voltage Low
- DTC 15, Coolant Temperature Sensor Signal Voltage High
- DTC 21, TPS Signal Voltage High
- DTC 22, TPS Signal Voltage Low
- DTC 24, Vehicle Speed Sensor Transmission Output Signal
- DTC 28, Trans. Range Pressure Switch
- DTCS 37/38, TCC Brake Switch On/Off
- DTC 39, TCC Stuck Off
- DTC 52/53, System Voltage High
- DTC 58, Trans. Fluid Temp. High
- DTC 59, Trans. Fluid Temp. Low
- DTC 68, Transmission Component Slipping
- DTC 69, Torque Converter Clutch Stuck On
- DTC 72, VSS Circuit Loss Transmission Output Signal
- DTC 74, Trans. Input Speed Error
- DTC 79, Trans. Fluid Temp. High
- DTC 85, Undefined Gear Ratio
- DTC 86, Low Gear Ratio Error
- DTC 87, High Gear Ratio Error
- Diagnostic Charts - Diesel
- On-Board Diagnostic (OBD) System Check - Models With Pcm
- On-Board Diagnostic (OBD) System Check - "G" & "P" Series With TCM
- Chart A-1, No Mil (Service Engine Soon Light) - Models W/Pcm
- Chart A-1, No Mil (Service Engine Soon Light) - "G" & "P" Series With TCM
- Chart A-2, No Scan Data, Mil (Service Engine Soon) On At All Times Or Will Not Flash Mil - Models With Pcm
- Chart A-2, No Data Link Connector (DLC) Data, Will Not Display DTC 12 Or Mil On Steady - "G" & "P" Series With TCM
- Chart A-3, Engine Cranks But Will Not Run
- DTC 14, Engine Coolant Temperature (ECT) Sensor Circuit Low (High Temperature Indicated)
- DTC 15, Engine Coolant Temperature (ECT) Sensor Circuit High (Low Temperature Indicated)
- DTC 24, Vehicle Speed Sensor Circuit Low (Trans Output Speed Signal)
- DTC 28, Trans. Range Pressure Switch Circuit Fault
- DTC 39, TCC Stuck Off
- DTC 58, Trans. Fluid Temp. Sensor Circuit Low (High Temperature Indicated)
- DTC 59, Trans. Fluid Temp. Sensor Circuit High (Low Temperature Indicated)
- DTC 68, Transmission Component Slipping
- DTC 69, Torque Converter Clutch Stuck On
- DTC 72, Vehicle Speed Sensor Circuit Loss (Transmission Output Signal)
- DTC 74, Trans. Input Speed Error
- DTC 79, Trans. Fluid Temp. High
- DTC 81, 2-3 Shift Solenoid Circuit Fault
- DTC 82, 1-2 Shift Solenoid Circuit Fault
- DTC 83, TCC PWM Solenoid Circuit Fault
- DTC 85, Undefined Gear Ratio
- DTC 86, Low Gear Ratio Error
- DTC 87, High Gear Ratio Error
- Component Tests
- Technical Service Bulletins (TSB)
- 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.