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.
1995 Chevrolet Forward Control 4.3 Z, AutomaticFACTORY OEM SERVICE PROCEDURE
Engine Performance DTCS (6.5L Diesel)
ENGINE PERFORMANCE DTCS (6.5L DIESEL)
| OEM Code | Description |
|---|---|
| 13 | ENGINE SHUTOFF SOLENOID CIRCUIT FAULT |
| 14 | ECT SENSOR CIRCUIT LOW (HIGH TEMPERATURE INDICATED) |
| 15 | ECT SENSOR CIRCUIT HIGH (LOW TEMPERATURE INDICATED) |
| 16 | VEHICLE SPEED SIGNAL BUFFER FAULT |
| 17 | HIGH RESOLUTION CIRCUIT FAULT |
| 18 | PUMP CAM REFERENCE PULSE ERROR |
| 19 | CRANKSHAFT POSITION REFERENCE ERROR |
| 21 | APP NO. 1 CIRCUIT HIGH (MODELS WITH PCM) |
| 22 | APP NO. 1 CIRCUIT LOW (MODELS WITH PCM) |
| 23 | APP NO. 1 CIRCUIT RANGE FAULT |
| 24 | VSS CIRCUIT LOW (TRANSMISSION OUTPUT SPEED SIGNAL) |
| 25 | ACCELERATOR PEDAL POSITION (APP) NO. 2 CIRCUIT HIGH |
| 26 | ACCELERATOR PEDAL POSITION (APP) NO. 2 CIRCUIT LOW |
| 27 | APP NO. 2 CIRCUIT RANGE FAULT |
| 28 | TRANSMISSION RANGE PRESSURE SWITCH CIRCUIT FAULT |
| 29 | GLOW PLUG RELAY CIRCUIT FAULT |
| 31 | EGR CONTROL PRESSURE/BARO SENSOR CKT LOW (HIGH VAC) |
| 32 | EGR CIRCUIT ERROR - "G" SERIES |
| 33 | EGR CONTROL PRESSURE/BARO SENSOR CKT HIGH (LOW VAC) |
| 34 | INJECTION TIMING STEPPER (ITS) MOTOR CIRCUIT FAULT |
| 35 | INJECTION PULSE WIDTH ERROR (RESPONSE TIME SHORT) |
| 36 | INJECTION PULSE WIDTH ERROR (RESPONSE TIME LONG) |
| 37 | TCC BRAKE SWITCH STUCK ON/OFF |
| 38 | TCC BRAKE SWITCH STUCK ON/OFF |
| 39 | TCC STUCK OFF (4L80-E) |
| 41 | BRAKE SWITCH CIRCUIT FAULT |
| 41 | BRAKE SWITCH CIRCUIT FAULT - "P" SERIES |
| 42 | FUEL TEMP CIRCUIT LOW (HIGH TEMP INDICATED) |
| 43 | FUEL TEMP CIRCUIT HIGH (LOW TEMP INDICATED) |
| 44 | EGR PULSE WIDTH ERROR - "G" SERIES |
| 45 | EGR VENT ERROR - "G" SERIES |
| 46 | MALFUNCTION INDICATOR LIGHT (MIL) CIRCUIT FAULT |
| 47 | IAT SENSOR CIRCUIT LOW (HIGH TEMPERATURE INDICATED) |
| 48 | IAT SENSOR CIRCUIT HIGH (LOW TEMPERATURE INDICATED) |
| 49 | SERVICE THROTTLE SOON LIGHT CIRCUIT FAULT |
| 51 | PROM PROBLEM (FAULTY OR INCORRECT PROM) |
| 52 | SYSTEM VOLTAGE HIGH LONG |
| 53 | SYSTEM VOLTAGE HIGH LONG |
| 54 | PCM FUEL CIRCUIT ERROR |
| 56 | INJECTION PUMP CALIBRATION RESISTOR ERROR |
| 57 | PCM 5-VOLT SHORTED |
| 58 | TRANSMISSION FLUID TEMP SENSOR CIRCUIT LOW (HIGH TEMP INDICATED) 4L60-E & 4L80-E |
| 59 | TRANSMISSION FLUID TEMP SENSOR CIRCUIT HIGH (LOW TEMP INDICATED) 4L60-E & 4L80-E |
| 61 | TURBO BOOST SENSOR CIRCUIT HIGH - "P" SERIES |
| 62 | TURBO BOOST SENSOR CIRCUIT LOW - "P" SERIES |
| 63 | ACCELERATOR PEDAL POSITION (APP) NO. 3 CIRCUIT HIGH (MODELS WITH PCM) |
| 63 | BARO SENSOR CIRCUIT HIGH/LOW (4L80-E WITH TCM) |
| 64 | APP NO. 3 CIRCUIT LOW (MODELS WITH PCM) |
| 64 | BARO SENSOR CIRCUIT HIGH/LOW (4L80-E WITH TCM) |
| 65 | APP NO. 3 CIRCUIT RANGE FAULT |
| 66 | 3-2 CONTROL SOLENOID CKT FAULT - "G" SERIES 4L60-E |
| 67 | TCC SOLENOID CIRCUIT FAULT - "G" SERIES 4L60-E |
| 68 | TRANSMISSION COMPONENT SLIPPING (4L80-E) |
| 69 | TCC STUCK ON (4L80-E) |
| 69 | TCC STUCK ON - "G" SERIES 4L60-E |
| 71 | CAMSHAFT POSITION SENSOR CIRCUIT LOW (4L80-E W/ TCM) |
| 71 | SET/COAST SWITCH FAULT (MODELS WITH PCM) |
| 72 | SPEED SENSOR CIRCUIT LOSS (TRANS OUTPUT SPEED SIGNAL) |
| 73 | PRESSURE CONTROL SOLENOID CIRCUIT (CURRENT ERROR) |
| 74 | TRANSMISSION INPUT SPEED SENSOR CIRCUIT (4L80-E) |
| 75 | SYSTEM VOLTAGE LOW |
| 76 | RESUME/ACCEL SWITCH FAULT |
| 78 | WASTEGATE SOLENOID FAULT - "P" SERIES |
| 79 | TRANSMISSION FLUID OVERTEMP - 4L60-E & 4L80-E |
| 81 | 2-3 SHIFT SOLENOID CIRCUIT FAULT |
| 82 | 1-2 SHIFT SOLENOID CIRCUIT FAULT |
| 83 | TCC PWM SOLENOID CIRCUIT FAULT |
| 84 | ACCELERATOR PEDAL POSITION (APP) CIRCUIT FAULT |
| 85 | UNDEFINED RATIO ERROR (4L80-E) |
| 86 | LOW RATIO ERROR (4L80-E) |
| 87 | HIGH RATIO ERROR (4L80-E) |
| 88 | TDC OFFSET ERROR |
| 91 | CYLINDER BALANCE FAULT |
| 92 | CYLINDER BALANCE FAULT |
| 93 | CYLINDER BALANCE FAULT |
| 94 | CYLINDER BALANCE FAULT |
| 95 | CYLINDER BALANCE FAULT |
| 96 | CYLINDER BALANCE FAULT |
| 97 | CYLINDER BALANCE FAULT |
| 98 | CYLINDER BALANCE FAULT |
| 99 | APP NO. 2 (5-VOLT REFERENCE FAULT) |
Factory Service Tools
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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.
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