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 7.4 NREPAIR AND DIAGNOSIS (SINGLE PAGE)GENERAL INFORMATIONDTC INDEXENGINE PERFORMANCE DTCS (5.0L)
1995 Chevrolet Forward Control 7.4 N
Engine Performance DTCS (5.0L)
1995 Chevrolet Forward Control 7.4 NSECTION Engine Performance DTCS (5.0L)
ENGINE PERFORMANCE DTCS (5.0L)
| OEM Code | Description |
|---|---|
| 13 | OPEN OXYGEN SENSOR CIRCUIT |
| 14 | COOLANT SENSOR SIGNAL VOLTAGE LOW |
| 15 | COOLANT SENSOR SIGNAL VOLTAGE HIGH |
| 16 | VSS BUFFER FAULT |
| 21 | TPS SIGNAL VOLTAGE HIGH |
| 22 | TPS SIGNAL VOLTAGE LOW |
| 24 | VSS - M/T |
| 28 | TRANSMISSION RANGE PRESSURE SWITCH |
| 32 | EGR CIRCUIT ERROR BACKPRESSURE EGR WITH SOLENOID "G" SERIES |
| 32 | EGR CIRCUIT ERROR WITH EVRV SOLENOID |
| 32 | EGR CKT ERROR - "C" & "K" SERIES W/ LINEAR EGR |
| 33 | MAP SENSOR SIGNAL VOLTAGE HIGH |
| 34 | MAP SENSOR SIGNAL VOLTAGE LOW |
| 35 | IDLE SPEED ERROR |
| 36 | IDLE SPEED ACTUATOR FAULT - A/T |
| 37 | TCC BRAKE SWITCH ON/OFF |
| 38 | TCC BRAKE SWITCH ON/OFF |
| 39 | TCC STUCK OFF - 4L80-E TRANSMISSION |
| 42 | IGNITION CONTROL |
| 43 | KNOCK SENSOR WITH SPARK CONTROL MODULE |
| 43 | KNOCK SENSOR WITHOUT SPARK MODULE (DUAL SENSORS) |
| 43 | KNOCK SENSOR WITHOUT SPARK MODULE (SINGLE SENSOR) |
| 44 | LEAN EXHAUST INDICATION |
| 45 | RICH EXHAUST INDICATION |
| 51 | PROM ERROR (FAULTY OR INCORRECT PROM) |
| 52 | FAULTY CALPAK |
| 52 | SYSTEM VOLTAGE HIGH |
| 53 | SYSTEM VOLTAGE HIGH |
| 54 | FUEL PUMP CIRCUIT |
| 55 | ECM/PCM ERROR |
| 58 | TRANSMISSION FLUID TEMPERATURE HIGH |
| 59 | TRANSMISSION FLUID TEMPERATURE LOW |
| 66 | 3-2 CONTROL SOLENOID CKT FAULT 4L60-E TRANSMISSION |
| 67 | TCC SOLENOID CIRCUIT CHECK - 4L60-E TRANSMISSION |
| 68 | OVERDRIVE RATIO ERROR - 4L80-E TRANSMISSION |
| 69 | TORQUE CONVERTER CLUTCH STUCK ON 4L60-E TRANSMISSION |
| 69 | TORQUE CONVERTER CLUTCH STUCK ON 4L80-E TRANSMISSION |
| 72 | VSS CIRCUIT LOSS TRANS OUTPUT SIGNAL |
| 73 | PRESSURE CONTROL SOLENOID (CURRENT ERROR) |
| 74 | TRANSMISSION INPUT SPEED ERROR 4L80-E TRANSMISSION |
| 75 | SYSTEM VOLTAGE LOW |
| 79 | TRANSMISSION FLUID TEMPERATURE HIGH |
| 81 | TRANSMISSION 2-3 ERROR |
| 82 | TRANSMISSION 1-2 ERROR |
| 83 | TCC SOLENOID CIRCUIT FAULT |
| 85 | UNDEFINED GEAR RATIO |
| 86 | LOW GEAR RATIO ERROR |
| 87 | HIGH GEAR RATIO ERROR |
RENDER: 1.0x
NO RELATED
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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.