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 MANUALSGMC1995RALLY G2500, 4.3 ZREPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSDTC INDEXENGINE PERFORMANCE DTCS (6.5L DIESEL)
1995 GMC Rally G2500, 4.3 Z
Engine Performance DTCS (6.5L Diesel)
1995 GMC Rally G2500, 4.3 ZSECTION 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) |
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.