Caterpillar Excavator Fault Codes: Your Essential Troubleshooting Guide - June 14, 2025
Welcome to our comprehensive guide on Caterpillar excavator fault codes. Understanding these codes is crucial for efficient troubleshooting and maintaining the optimal performance of your valuable machinery. Whether you own a Cat 320, 320B, 330C, 320D, or equipment powered by a Cat C9 engine, this guide will help you decipher those perplexing error messages. At Growshine International, we understand the importance of keeping your construction equipment running smoothly, which is why we've compiled this helpful resource. We are a leading provider of high-quality engineering machinery parts, heavy truck parts, agricultural machinery parts, and auto parts, serving clients globally.
Below, you'll find detailed tables of Caterpillar excavator fault codes specific to various models. Recognizing these codes can save you time and money by allowing for quicker diagnosis of potential issues. Remember that prompt attention to these faults can prevent more significant damage and downtime for your operations. Growshine International is your trusted partner for sourcing the parts you need to address these faults effectively.
Part 1: Cat 320 Excavator Fault Codes
| Fault Code | Fault Description |
|---|---|
| E0 | No Fault |
| E1 | Engine oil pressure low |
| E2 | Engine water temperature high |
| E3 | Hydraulic oil temperature high |
| E4 | Battery voltage high |
| E5 | Alternator P or W terminal disconnected |
| E6 | Engine speed sensor incorrectly installed or circuit open |
| E7 | Engine speed abnormal |
| E9 | Throttle motor feedback voltage low |
| El0 | Throttle feedback sensor circuit shorted to power supply or open |
| E11 | Throttle feedback sensor shorted to ground |
| E12 | Throttle feedback sensor voltage unstable |
| E13 | Throttle motor circuit shorted to ground |
| E14 | Throttle motor not rotating or motor circuit shorted to power supply |
| E15 | Throttle backup switch in backup position or throttle motor circuit open |
| E16 | Proportional reducing valve shorted to ground |
| E17 | Proportional reducing valve circuit shorted to power supply |
| E18 | Proportional reducing valve circuit open |
| E25 | Water temperature sensor shorted to ground |
| E27 | Hydraulic oil temperature sensor shorted to ground |
| E31 | Engine speed signal received by controller differs from 10 set values of throttle dial |
| E32 | Difference between throttle dial setting value and actual speed exceeds 100r/min |
| E33 | Data output circuit shorted to power supply |
| E34 | Throttle motor action lags behind throttle dial by 2.5s |
| E36 | Time for monitor to read signal from controller exceeds 1s |
| E37 | Monitor RAM abnormal |
| E38 | Controller receives incorrect signal from monitor |
| E39 | Controller itself generates incorrect signal |
| E40 | Controller memory error |
| E41 | Controller does not match machine model |
| E48 | Engine stalled |
| E48 | Engine stalled |
Part 2: Cat 320B Excavator Fault Codes
| Fault Code | Fault Description |
|---|---|
| 1301 | Engine oil pressure low |
| 1302 | Engine coolant temperature high |
| 1303 | Hydraulic oil temperature high |
| 1304 | Air intake 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 deviation |
| 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 supply (digital output) overcurrent |
| 4105 | Overcurrent in digital output (trenching solenoid valve) |
| 4106 | Overcurrent in digital output (inching control solenoid valve) |
| 4107 | Overcurrent in digital output (travel speed change solenoid valve) |
| 4108 | Overcurrent in digital output (travel alarm) |
| 4109 | Backup solenoid coil 1 (digital output) overcurrent |
| 410A | Overcurrent in digital output (swing brake solenoid valve) |
| 410B | Backup 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 | Backup PWM sensor 1 connected to chassis ground shorted |
| 4206 | Backup PWM sensor 2 connected to chassis ground shorted |
| 4207 | Pump delivery pressure PWM sensor open circuit during power-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 dial not in one of 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 |
Part 3: Cat 330C Excavator Fault Codes
| Fault Code | Fault 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 Valve |
| 0376 | Travel Alarm |
| 0581 | Power Shift Proportional Reducing Valve |
| 0586 | Engine Speed Dial Switch |
| 0587 | Regulator Drive Feedback Signal |
| 0590 | Engine Controller |
| 0598 | Travel 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 Code Descriptions:
| FMI | Fault Description |
|---|---|
| 0 | Data valid but above normal operational range |
| 1 | Data valid but below normal operational range |
| 2 | Signal 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 shorted low |
| 7 | Mechanical system not responding correctly |
| 8 | Abnormal frequency, pulse width, or period |
| 9 | Abnormal update rate |
| 10 | Abnormal rate of change |
| 11 | Fault mode not identifiable |
| 12 | Bad device or component |
| 13 | Out of calibration |
| 14-31 | Reserved |
Part 4: Cat 320D Excavator Fault Codes
| Fault Code | Fault Description |
|---|---|
| 00 | Data valid but above normal operating range |
| 01 | Data valid but below normal operating range |
| 02 | Signal erratic (data unstable, intermittent, or incorrect) |
| 03 | Voltage above normal |
| 04 | Voltage below normal |
| 05 | Current below normal |
| 06 | Current above normal |
| 07 | Mechanical system not responding correctly |
| 08 | Signal abnormal (frequency, pulse width, or period abnormal) |
| 9 | Abnormal update rate |
| 10 | Abnormal rate of change |
| 11 | Fault 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) not responding |
| 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 |
| 0190 | Engine Speed Sensor |
| 0246 | CAN Data Link |
| 0247 | SAE J1939 Data Link |
| 0248 | Caterpillar Data Link |
| 0254 | Electronic Control Module (ECM) |
| 0262 | 5V Sensor Power Supply |
| 0271 | Alarm Device |
| 0291 | Engine Cooling Fan Solenoid Valve |
| 0362 | Engine Variable 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 | Travel Speed Changeover 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 | #2 Relief Valve Pilot Solenoid Valve |
| 1523 | #1 Relief Valve Pilot Solenoid Valve |
| 1525 | Straight Travel Solenoid Valve |
| 1590 | Main Hydraulic Pump Output Limit Pressure Solenoid Valve |
| 1593 | #1 Auxiliary Valve Extend Pressure Solenoid Valve |
| 1594 | #2 Auxiliary Valve Extend Pressure Solenoid Valve |
| 1595 | #3 Auxiliary Valve Pressure Solenoid Valve |
| 1596 | #1 Auxiliary Valve Retract Pressure Solenoid Valve |
| 1597 | #2 Auxiliary Valve Retract Pressure Solenoid Valve |
| 1598 | #3 Auxiliary Valve Cancel Pressure Solenoid Valve |
| 1609 | F2 Mode Valve Circuit Feedback Pressure Sensor |
| 1657 | Left Joystick Top Button |
| 1658 | Right Joystick Top Button |
| 1665 | #1 Adjustable Pressure Relief Valve Solenoid Valve |
| 1666 | #2 Adjustable Pressure Relief Valve Solenoid Valve |
| 1931 | Option Circuit |
| 2265 | Pump Output Pressure Sensor 1 |
| 2266 | Pump Output Pressure Sensor 2 |
| 2275 | Hammer Return Line Control (Direct to Tank) Solenoid Valve |
| 2280 | Travel Alarm Relay |
| 2300 | Switch Panel |
Part 5: Cat C9 Engine Fault Codes
| Fault Code | Fault Description |
|---|---|
| 112 | Accelerator Pedal #1 Fault |
| 113 | Accelerator Pedal and Brake Pedal Signals Not Plausible |
| 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 Not Reversible Fault |
| 125 | Main Relay 2 Failed |
| 126 | Battery Voltage Fault |
| 127 | Engine Brake Failed |
| 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 | Preheating Control System Fault |
| 225 | Main Relay Failed (Interrupted 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 Outside Limit Value |
| 149 | Fuel Filter Heater Fault |
| 14A | Prompt: Engine Compartment Start Button Jammed |
| 14D | Prompt: Engine Overspeed Protection |
| 24A | Engine Compartment Stop Button Jammed |
| 152 | Common Rail Pressure Positive Deviation Too High and Fuel Flow Setpoint Too High |
| 153 | Common Rail Pressure Negative Deviation Too High (Minimum Flow) |
| 154 | Common Rail Pressure Below Minimum Limit |
| 155 | Common Rail Pressure Above Maximum Limit |
| 156 | Common Rail Fuel Pressure Drop Rate Too High |
| 157 | Common Rail Metering Valve Implausible During Overspeed |
| 158 | Common Rail Metering Device Fuel Flow Setpoint Too Low |
| 159 | Common Rail Pump Metering Valve Power Stage Fault |
| 259 | Common Rail Metering Valve Short Circuit to Positive |
| 359 | Common Rail Metering Valve Short Circuit to Negative |
| 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 Injected Cylinders Not Reached |
| 171 | Injector Wiring 1 Fault |
| 172 | Injector Wiring 2 Fault |
| 17C | Injector Control Device ECU: CY33X(1) Fault |
| 27C | Injector Control Device ECU: CY33X(2) Fault |
| 19E | Torque Limitation Active to Reduce Smoke |
| 29D | Torque Limitation Active Because of Negative Torque Produced |
| 39E | Torque Limitation Active Because of Turbocharger Protection |
| 49E | Torque Limitation Active Due to Engine Protection |
| 69E | Torque Limitation Active Due to Injection Quantity Limitation of Injection System |
Understanding these fault codes is just the first step. When you encounter an issue, prompt replacement with genuine, high-quality parts is essential. That's where Growshine International comes in. We specialize in the import and export of a wide range of machinery parts, ensuring that you have access to the components you need, when you need them.
Growshine International: Your Global Partner for Machinery Parts
Growshine International is a leading import and export trading company specializing in engineering machinery parts, heavy truck parts, agricultural machinery parts, and auto parts. We are committed to providing our customers with reliable, high-performance parts at competitive prices. Our extensive network and expertise in global logistics ensure timely delivery, no matter where you are located.
We offer a comprehensive range of parts, including:
Excavator hydraulic pumps
Heavy truck turbochargers
Agricultural machinery fuel injectors
Auto parts starters
Excavator swing motors
Heavy truck air filters
Agricultural machinery water pumps
Excavator main control valves
Heavy truck engine assemblies
Auto parts brake pads
Construction machinery spare parts
Diesel engine parts for heavy trucks
Tractor parts and accessories
Automotive filters and lubrication
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Engine cooling system components for trucks
Understanding Your Machinery: Key Component Explanations
Excavator Hydraulic Pump: This is the heart of the excavator's hydraulic system, converting mechanical power from the engine into hydraulic power to drive the various actuators. For example, a Caterpillar 345D hydraulic pump (液压泵 - yè yā bèng; гидравлический насос - gidravlicheskiy nasos) provides the necessary pressure and flow for digging and lifting operations.
Heavy Truck Turbocharger: This component increases the power output and efficiency of a heavy truck's engine by forcing more air into the combustion chamber. A Caterpillar C15 turbocharger (涡轮增压器 - wō lún zēng yā qì; турбокомпрессор - turbokompressor) is crucial for optimal engine performance.
Agricultural Machinery Fuel Injector: This precisely meters and sprays fuel into the engine's cylinders for combustion in agricultural machines like tractors and harvesters. Caterpillar agricultural tractors often use fuel injectors (喷油嘴 - pēn yóu zuǐ; топливный инжектор - toplivnyy inzhektor) for efficient fuel delivery.
Auto Parts Starter: This electric motor cranks the engine of a car or truck to initiate the combustion process. A reliable Caterpillar auto starter motor (起动机 - qǐ dòng jī; стартер - starter) ensures your vehicle starts smoothly.
Excavator Swing Motor: This hydraulic motor enables the upper structure of an excavator to rotate, allowing for a wide range of motion during operation. For instance, the Caterpillar 320 series uses a swing motor (行走马达 - xíng zǒu mǎ dá; поворотный двигатель - povorotnyy dvigatel) for its rotational capabilities.
Heavy Truck Air Filter: This component cleans the air entering the engine, preventing dust and debris from causing damage and ensuring optimal engine performance in heavy trucks. Caterpillar heavy trucks rely on high-quality air filters (空气滤清器 - kōng qì lǜ qīng qì; воздушный фильтр - vozdushnyy fil'tr) for engine protection.
Agricultural Machinery Water Pump: This circulates coolant through the engine of agricultural equipment to prevent overheating. A properly functioning water pump is vital for Caterpillar agricultural engines (水泵 - shuǐ bèng; водяной насос - vodyanoy nasos).
Excavator Main Control Valve: This valve directs the flow of hydraulic fluid to various parts of the excavator, controlling functions like digging, lifting, and swinging. The Caterpillar 330C main control valve (主控阀 - zhǔ kòng fá; главный распределительный клапан - glavnyy raspredelitel'nyy klapan) is essential for precise operation.
Heavy Truck Engine Assembly: This is the complete, assembled engine unit for a heavy truck, ready for installation. Caterpillar offers various engine assemblies (发动机总成 - fā dòng jī zǒng chéng; двигатель в сборе - dvigatel' v sbore) for its range of heavy-duty vehicles.
Auto Parts Brake Pads: These are crucial components of a vehicle's braking system, creating friction against the rotors to slow down or stop the vehicle. Quality Caterpillar brake pads (刹车鼓 - shā chē gǔ; тормозные колодки - tormoznyye kolodki) are vital for safety.
For all your engineering machinery parts, heavy truck parts, agricultural machinery parts, and auto parts needs, trust Growshine International. We are dedicated to providing exceptional products and services to our clients worldwide.
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