Caterpillar C9 Fault Codes: A Comprehensive Guide for Troubleshooting on June 14, 2025
Understanding Caterpillar C9 engine fault codes is crucial for efficient diagnostics and maintenance of your heavy-duty machinery. This page provides a detailed list of common Caterpillar C9 fault codes to help you identify potential issues. Whether you're dealing with construction equipment, heavy trucks, or agricultural machinery powered by the CAT C9 engine, this information can assist in quickly pinpointing problems.
Caterpillar C9 Fault Code Table
| Fault Code | Description |
|---|---|
| 112 | Accelerator Pedal 1 Fault |
| 113 | Accelerator Pedal and Brake Pedal Signals Implausible |
| 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 Stuck |
| 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 (Interruption After Shutdown) |
| 228 | Main Relay 1 Short Circuit to Ground |
| 131 | Coolant Temperature Sensor |
| 132 | Coolant Temperature Sensor Dynamic Fault |
| 133 | Intake Air Temperature Sensor B |
| 134 | Intake Pressure Sensor |
| 135 | Fuel Temperature Sensor |
| 136 | Common Rail Pressure Sensor |
| 137 | Common Rail Pressure Relief 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 |
| 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 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 Line 1 Fault |
| 172 | Injector Line 2 Fault |
| 17C | Injector Control Device ECU: CY33X(1) Fault |
| 27C | Injector Control Device ECU: CY33X(2) Fault |
| 19E | Torque Limitation Active Due to Smoke Limitation |
| 29D | Torque Limitation Active Due to Negative Torque Generated |
| 39E | Torque Limitation Active Due to Turbocharger Protection |
| 49E | Torque Limitation Active Due to Engine Protection |
| 69E | Torque Limitation Active Due to Injection Amount Limitation Injection System |
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Component Explanations (English, Chinese, Russian):
Caterpillar 345D Fan Motor: The fan motor is responsible for driving the cooling fan in the Caterpillar 345D excavator, regulating engine temperature. (中文: 卡特彼勒 345D 风扇马达; Russian: Вентиляторный мотор Caterpillar 345D)
Volvo FH16 Oil Pressure Sensor: This sensor monitors the oil pressure in the Volvo FH16 heavy truck engine, ensuring proper lubrication. (中文: 沃尔沃 FH16 机油压力传感器; Russian: Датчик давления масла Volvo FH16)
John Deere 8320R Coolant Temperature Sensor: Located in the John Deere 8320R tractor engine, this sensor measures the coolant temperature to prevent overheating. (中文: 约翰迪尔 8320R 冷却液温度传感器; Russian: Датчик температуры охлаждающей жидкости John Deere 8320R)
Cummins ISX Crankshaft Speed Sensor: This sensor in the Cummins ISX heavy-duty truck engine tracks the crankshaft's rotational speed. (中文: 康明斯 ISX 曲轴转速传感器; Russian: Датчик частоты вращения коленчатого вала Cummins ISX)
Komatsu PC210-8 Fuel Injector: The fuel injector in the Komatsu PC210-8 excavator precisely delivers fuel into the engine cylinders. (中文: 小松 PC210-8 喷油器; Russian: Топливная форсунка Komatsu PC210-8)
Scania R500 Common Rail Pump: The common rail pump in the Scania R500 truck delivers high-pressure fuel to the common rail. (中文: 斯堪尼亚 R500 共轨油泵; Russian: Топливный насос высокого давления Scania R500)
Massey Ferguson 7718 S Fuel Filter: The fuel filter in the Massey Ferguson 7718 S tractor removes contaminants from the fuel. (中文: 马赛弗格森 7718 S 燃油滤清器; Russian: Топливный фильтр Massey Ferguson 7718 S)
Mercedes-Benz Actros Battery Voltage Sensor: This sensor monitors the battery voltage in the Mercedes-Benz Actros truck. (中文: 梅赛德斯-奔驰 Actros 蓄电池电压传感器; Russian: Датчик напряжения аккумулятора Mercedes-Benz Actros)
Hitachi ZX350H Intake Air Temperature Sensor: Located in the Hitachi ZX350H excavator, this sensor measures the temperature of the air entering the engine. (中文: 日立 ZX350H 进气温度传感器; Russian: Датчик температуры всасываемого воздуха Hitachi ZX350H)
MAN TGX Clutch Signal Sensor: This sensor detects the clutch pedal position in the MAN TGX heavy truck. (中文: 曼 TGX 离合信号传感器; Russian: Датчик сигнала сцепления MAN TGX)
Growshine International is your trusted partner for sourcing a wide array of construction machinery parts, heavy truck parts, agricultural machinery parts, and auto parts from around the globe. We facilitate seamless import and export processes, ensuring you get the parts you need, when you need them. Our commitment is to provide high-quality components that meet or exceed OEM standards, helping you minimize downtime and maximize the lifespan of your valuable equipment.
Our main business includes:
Import of engineering machinery accessories
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