Caterpillar Excavator Fault Codes - Troubleshooting Guide by Growshine International
Saturday, June 14, 2025
Cat 320 Excavator Fault Codes
| Fault Code | Description |
|---|---|
| E0 | No Fault |
| E1 | Engine oil pressure too low |
| E2 | Engine water temperature too high |
| E3 | Hydraulic oil temperature too high |
| E4 | Battery voltage too high |
| E5 | Alternator P or W terminal disconnected |
| E6 | Speed sensor incorrectly installed or circuit open |
| E7 | Engine speed abnormal |
| E9 | Throttle motor feedback voltage too low |
| El0 | Throttle feedback sensor circuit short to power or open |
| E11 | Throttle feedback sensor short to ground |
| E12 | Throttle feedback sensor voltage unstable |
| E13 | Throttle motor circuit short to ground |
| E14 | Throttle motor not rotating or motor circuit short to power |
| E15 | Throttle backup switch in backup position or throttle motor circuit open |
| E16 | Proportional reducing valve short to ground |
| E17 | Proportional reducing valve circuit short to power |
| E18 | Proportional reducing valve circuit open |
| E25 | Water temperature sensor short to ground |
| E27 | Hydraulic oil temperature sensor short to ground |
| E31 | Engine speed signal received by controller differs from 10 set throttle dial values |
| E32 | Difference between throttle dial set value and actual speed exceeds lOOr/min |
| E33 | Data output circuit short to power |
| E34 | Throttle motor action lags throttle dial by 2.5s |
| E36 | Time for monitor to read signal from controller exceeds Is |
| E37 | Monitor RAM abnormal |
| E38 | Controller receives error signal from monitor |
| E39 | Controller generates its own error signal |
| E40 | Controller memory error |
| E41 | Controller does not match machine model |
| E48 | Engine stalled |
| E48 | Engine stalled |
Cat 320B Excavator Fault Codes
| Fault Code | Description |
|---|---|
| 1301 | Engine oil pressure too low |
| 1302 | Engine coolant temperature too high |
| 1303 | Hydraulic oil temperature too high |
| 1304 | Air inlet filter clogged |
| 1305 | Battery voltage abnormal |
| 2201 | Governor actuator feedback sensor connected to battery voltage open or shorted |
| 2202 | Governor actuator feedback sensor connected to chassis ground shorted |
| 2301 | Governor actuator feedback signal unstable |
| 2302 | Governor actuator feedback signal deviated |
| 2303 | Governor actuator does not move |
| 2304 | Calibration data error |
| 3201 | Monitor RAM abnormal |
| 4101 | Too much power supplied to controller (43 volts) |
| 4102 | PRV current too high |
| 4103 | PRV open circuit |
| 4104 | Monitor power (digital output) overcurrent |
| 4105 | Overcurrent in digital output (ditch solenoid valve) |
| 4106 | Overcurrent in digital output (fine control solenoid valve) |
| 4107 | Overcurrent in digital output (travel speed change solenoid valve) |
| 4108 | Overcurrent in digital output (travel alarm) |
| 4109 | Spare solenoid coil 1 (digital output) overcurrent |
| 410A | Overcurrent in digital output (turntable brake solenoid valve) |
| 410B | Spare solenoid coil 2 (digital output) overcurrent |
| 4201 | Engine speed abnormal |
| 4202 | Engine coolant temperature sensor connected to chassis ground shorted |
| 4203 | Hydraulic oil temperature sensor connected to chassis ground shorted |
| 4204 | Pump delivery pressure PWM sensor connected to chassis ground shorted |
| 4205 | Spare PWM sensor 1 connected to chassis ground shorted |
| 4206 | Spare PWM sensor 2 connected to chassis ground shorted |
| 4207 | Pump delivery pressure PWM sensor open circuit when powered on |
| 420A | Fuel sensor connected to chassis ground open circuit |
| 420B | Fuel sensor connected to battery voltage open or shorted |
| 420C | Power supply too low (below 23 volts) |
| 420D | Power supply too high (above 32 volts) |
| 420E | Engine speed knob not in one of the 10 specified positions |
| 4301 | Alternator and speed sensor data mismatch 1 (alternator abnormal) |
| 4302 | Alternator and speed sensor data mismatch 2 (speed sensor abnormal) |
| 4303 | Engine stalled |
| A201 | Monitor communication abnormal |
| A202 | Monitor takes too long to respond to controller signal |
| A203 | Communication abnormal in controller |
| A20D | ADEM communication interrupted |
Cat 330C Excavator Fault Codes
| Fault Code | Description |
|---|---|
| 0001 | #1 Cylinder Injector Solenoid Valve |
| 0002 | #2 Cylinder Injector Solenoid Valve |
| 0003 | #3 Cylinder Injector Solenoid Valve |
| 0004 | #4 Cylinder Injector Solenoid Valve |
| 0005 | #5 Cylinder Injector Solenoid Valve |
| 0006 | #6 Cylinder Injector Solenoid Valve |
| 0041 | 8V DC Power Supply |
| 0042 | Injector Actuation Control Valve |
| 0091 | Throttle Position Signal |
| 0094 | Fuel Pressure Sensor |
| 0100 | Engine Oil Pressure Sensor |
| 0110 | Engine Coolant Temperature Sensor |
| 0164 | Injector Actuation Pressure |
| 0168 | System Voltage |
| 0172 | Intake Manifold Air Temperature |
| 0175 | Engine Oil Temperature Sensor |
| 0190 | Engine Speed Sensor |
| 0253 | Personality Module |
| 0261 | Engine Timing Calibration |
| 0262 | 5V Sensor DC Power Supply |
| 0268 | Check Programmable Parameters |
| 0273 | Turbocharger Outlet Pressure Sensor |
| 0274 | Atmospheric Pressure Sensor |
| 0286 | Oil Lamp |
| 0342 | Secondary Engine Speed Sensor |
| 0617 | Air Intake Heater Relay |
| 1627 | Fuel Pump Relay |
| 0091 | Throttle Position Signal |
| 0096 | Fuel Level Sensor |
| 0110 | Engine Coolant Temperature Sensor |
| 0167 | Alternator |
| 0168 | Key Switch Voltage |
| 0190 | Speed Sensor |
| 0248 | CAT Data Link |
| 0286 | Engine Oil Pressure Low Signal |
| 0374 | Swing Brake Solenoid |
| 0376 | Travel Alarm |
| 0581 | Power Shift Proportional Reducing Valve |
| 0586 | Engine Speed Dial Switch |
| 0587 | Regulator Actuator Feedback Signal |
| 0590 | Engine Controller |
| 0598 | Walking Speed Solenoid Valve |
| 0600 | Hydraulic Oil Temperature Sensor |
| 1161 | Pump Pressure |
| 1162 | Pump Pressure |
| 1524 | Negative Flow Control Proportional Solenoid Valve |
| 1525 | Straight Travel Solenoid Valve |
| 1590 | Negative Flow Control Proportional Solenoid Valve |
| FMI Fault Codes Description | |
| 0 | Data valid but above normal operating range |
| 1 | Data valid but below normal operating range |
| 2 | Data erratic, intermittent, or incorrect |
| 3 | Voltage above normal or shorted high |
| 4 | Voltage below normal or shorted low |
| 5 | Current below normal or open circuit |
| 6 | Current above normal or grounded circuit |
| 7 | Mechanical system not responding correctly |
| 8 | Abnormal frequency, pulse width, or period |
| 9 | Abnormal update rate |
| 10 | Abnormal rate of change |
| 11 | Failure mode not identifiable |
| 12 | Bad device or component |
| 13 | Out of calibration |
| 14-31 | Reserved |
Cat 320D Excavator Fault Codes
| Fault Code | Description |
|---|---|
| 00 | Data valid, but above normal operating range |
| 01 | Data valid, but below normal operating range |
| 02 | Signal error (data unstable, intermittent, or erroneous) |
| 03 | Voltage above normal value |
| 04 | Voltage below normal value |
| 05 | Current below normal value |
| 06 | Current above normal value |
| 07 | Mechanical system response abnormal |
| 08 | Signal abnormal (frequency, pulse width, or cycle abnormal) |
| 9 | Update abnormal |
| 10 | Rate of change abnormal |
| 11 | Failure mode not identifiable |
| 12 | Device or component damaged |
| 13 | Calibration failed |
| 14 | Parallel metering fault |
| 15 | Parallel metering fault |
| 16 | Parallel metering invalid |
| 17 | Module (program) did not respond |
| 18 | Sensor power failure |
| 19 | Receiving network data error |
| 20 | Parallel metering fault |
| 0041 | 8V Power Supply |
| 0096 | Fuel Level Sensor |
| 0110 | Engine Coolant Temperature Sensor |
| 0167 | Alternator |
| 0168 | System Power Supply |
| 0190 | Engine Speed Sensor |
| 0246 | CAN Data Link |
| 0247 | SAE J1939 Data Link |
| 0248 | Caterpillar Data Link |
| 0254 | Electronic Control Module (ECM) |
| 0262 | sv Sensor Power Supply |
| 0271 | Alarm Device |
| 0291 | Engine Cooling Fan Solenoid Valve |
| 0362 | Engine Variable Speed Fan Control Solenoid Valve |
| 0374 | Swing Brake Solenoid Valve |
| 0485 | Engine Fan Reversing Solenoid Valve |
| 0544 | Engine Cooling Fan Variable Speed Solenoid Valve |
| 0581 | Power Shift Pressure Proportional Solenoid Valve |
| 0586 | Engine Throttle Dial |
| 0588 | Instrument Display System |
| 0590 | ECM |
| 0598 | Walking Speed Conversion Solenoid Valve |
| 0600 | Hydraulic Oil Temperature Sensor |
| 0735 | Heavy Lift Solenoid Valve |
| 1129 | Right Attachment Pedal Sensor |
| 1130 | Left Attachment Pedal Sensor |
| 1160 | Hydraulic Lock Solenoid Valve |
| 1178 | Mechanical Overload Alarm Pressure Sensor |
| 1522 | No. 2 Relief Valve Check Valve Solenoid Valve |
| 1523 | No. 1 Relief Valve Check Valve Solenoid Valve |
| 1525 | Straight Travel Solenoid Valve |
| 1590 | Main Hydraulic Pump Output Limiting Pressure Solenoid Valve |
| 1593 | No. 1 Attachment Valve Extend Pressure Solenoid Valve |
| 1594 | No. 2 Attachment Valve Extend Pressure Solenoid Valve |
| 1595 | No. 3 Attachment Valve Pressure Solenoid Valve |
| 1596 | No. 1 Attachment Valve Retract Pressure Solenoid Valve |
| 1597 | No. 2 Attachment Valve Retract Pressure Solenoid Valve |
| 1598 | No. 3 Attachment Valve Cancel Pressure Solenoid Valve |
| 1609 | F2 Mode Valve Circuit Feedback Pressure Sensor |
| 1657 | Left Joystick Top Button |
| 1658 | Right Joystick Top Button |
| 1665 | No. 1 Adjustable Pressure Relief Valve Solenoid Valve |
| 1666 | No. 2 Adjustable Pressure Relief Valve Solenoid Valve |
| 1931 | Optional Circuit |
| 2265 | Pump Output Pressure Sensor l |
| 2266 | Pump Output Pressure Sensor 2 |
| 2275 | Breaker Return Oil Line Control (Direct to Oil Tank) Solenoid Valve |
| 2280 | Travel Alarm Relay |
| 2300 | Switch Panel |
Cat C9 Engine Fault Codes
| Fault Code | Description |
|---|---|
| 112 | Accelerator Pedal 1 Fault |
| 113 | Accelerator Pedal and Brake Pedal Signals Unreliable |
| 116 | Clutch Signal Fault |
| 117 | Brake Pedal Fault |
| 119 | Terminal 15 Fault |
| 11C | Fuel Filter Water Separator |
| 211 | Vehicle Speed Sensor Fault |
| 215 | Cruise Control Button Irreversible Fault |
| 125 | Main Relay 2 Failure |
| 126 | Battery Voltage Fault |
| 127 | Engine Brake Failure |
| 128 | Main Relay 1 Short Circuit to Battery |
| 129 | Main Relay 3 Fault |
| 12A | Engine Brake (Main Relay 4) Fault |
| 12B | Air Heater 1 Power Stage Fault |
| 12E | Preheat Control System Fault |
| 225 | Main Relay Failure (Interruption After Stop) |
| 228 | Main Relay 1 Short Circuit to Ground |
| 131 | Coolant Temperature Sensor |
| 132 | Coolant Temperature Sensor Dynamic Fault |
| 133 | B Intake Temperature Sensor |
| 134 | Intake Pressure Sensor |
| 135 | Fuel Temperature Sensor |
| 136 | Common Rail Pressure Sensor |
| 137 | Common Rail Pressure Limiting Valve |
| 138 | Oil Pressure Sensor |
| 13A | Oil Temperature Sensor |
| 232 | Coolant Temperature (Monitoring) |
| 236 | Common Rail Pressure Sensor Deviation Monitoring |
| 238 | Oil Pressure Too Low |
| 23A | Oil Temperature Too High |
| 141 | Crankshaft Speed Sensor |
| 142 | Camshaft Sensor Signal Only |
| 143 | Camshaft Sensor |
| 144 | Camshaft Sensor and Crankshaft Sensor Signal Deviation Exceeds Limit |
| 149 | Fuel Filter Heater Fault |
| 14A | Engine Compartment Start Button Stuck |
| 14D | Note: Engine Overspeed Protection |
| 24A | Engine Compartment Stop Button Stuck |
| 152 | Common Rail Pressure Positive Deviation Too High and Fuel Flow Set Value Too High |
| 153 | Common Rail Pressure Negative Deviation Too High (Minimum Flow) |
| 154 | Common Rail Pressure Below Minimum Limit |
| 155 | Common Rail Pressure Greater Than Maximum Limit |
| 156 | Common Rail Fuel Pressure Drop Rate Too High |
| 157 | S Overspeed Common Rail Metering Valve Not Authentic |
| 158 | Common Rail Metering Unit Fuel Flow Setting Point Too Low |
| 159 | Common Rail Oil Pump Metering Valve Power Stage Fault |
| 259 | Common Rail Metering Valve Positive Short Circuit |
| 359 | Common Rail Metering Valve Negative Short Circuit |
| 161 | Cylinder 1 Injector Fault |
| 162 | Cylinder 2 Injector Fault |
| 163 | Cylinder 3 Injector Fault |
| 164 | Cylinder 4 Injector Fault |
| 165 | Cylinder 5 Injector Fault |
| 166 | Cylinder 6 Injector Fault |
| 167 | Cylinder 1 Injector Open Circuit |
| 168 | Cylinder 2 Injector Open Circuit |
| 169 | Cylinder 3 Injector Open Circuit |
| 16A | Cylinder 4 Injector Open Circuit |
| 16B | Cylinder 5 Injector Open Circuit |
| 16C | Cylinder 6 Injector Open Circuit |
| 16E | Minimum Number of Injection Cylinders Not Reached |
| 171 | Injector Wiring Harness 1 Fault |
| 172 | I Injector Wiring Harness 2 Fault |
| 17C | ECU Injector Control Unit: CY33X(1) Fault |
| 27C | ECU Injector Control Unit: CY33X(2) Fault |
| 19E | Limit Torque Value to Reduce Smoke |
| 29D | Torque Limitation Due to Negative Torque |
| 39E | Torque Limitation Due to Turbocharger Protection |
| 49E | Torque Limitation on Engine Protection |
| 69E | Torque Limitation on Injection Amount of Fuel Injection System |
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