Caterpillar Excavator Fault Code List

CAT excavators are among the top five users in the world. Its stable quality has won a very good reputation. However, in the processing of using, the excavator alarm occurs from time to time. Many excavator masters have no idea because they don’t understand the simple fault code. When the fault code form is displayed on the dashboard, it is not known whether there is a problem with one component or the entire system appears to be a problem. In the end, most of the masters will choose to hire a professional maintenance technician to handle all the problems. Without professional tools, it will take a lot of time to troubleshoot problems. Sometimes, the maintenance master will not find the problem without relevant experience. In this way, a lot of our time and financial resources are wasted.

Therefore, understanding the meaning of these fault codes is very important for the excavator. Especially for some small faults, you don’t have to go to the maintenance factory, you can follow the prompts to eliminate the problem. This article introduces the main fault codes for the Cat 320 (BCD Series) and Caterpillar C9 details as follows: 

Caterpillar fault code

Cat 320B excavator partial fault code

error code Fault description
E0 No Fault
E1 Engine oil pressure is too low
E2 Engine water temperature is too high
E3 Hydraulic oil temperature is too high
E4 Battery voltage is too high
E5 Generator Por W contact disconnected
E6 The speed sensor is not installed correctly or the circuit is open
E7 Engine speed is abnormal
E9 Throttle motor feedback voltage is too low
El0 Throttle feedback sensor circuit shorts or opens the power supply
E11 Throttle feedback sensor shorted to ground
E12 Throttle feedback sensor voltage is unstable
E13 Throttle motor circuit shorted to ground
E14 The throttle motor does not rotate or the motor circuit is shorted to the power supply
E15 Throttle reserve switch in standby position or throttle motor circuit open
E16 Proportional pressure reducing valve shorted to ground
E17 Proportional pressure reducing valve circuit shorts the power supply
E18 Proportional pressure reducing valve circuit open circuit
E25 Water temperature sensor shorted to ground
E27 Hydraulic oil temperature sensor shorted to ground
E31 The engine speed signal received by the controller is different from the 10 set values of the throttle disc.
E32 The difference between the throttle disc set value and the actual speed exceeds lOOr/min
E33 Data output circuit shorts the power supply
E34 Throttle motor action lags behind throttle disc 2.5s
E36 The monitor reads the signal from the controller for more than Is
E37 Monitor RAM is not working properly
E38 The controller gets an error signal from the monitor
E39 The controller itself generates an error signal
E40 Controller memory error
E41 The controller does not match the mechanical model
E48 Engine stop

Cat 320B excavator partial fault code

error
code
Fault description
1301  Engine oil pressure is too low
1302  Engine coolant temperature is too high
1303  Hydraulic oil temperature is too high
1304  Intake filter plug
1305  Abnormal battery voltage
2201  Governor actuator feedback sensor connected to battery voltage is open or shorted
2202  Governor actuator feedback sensor shorted to body ground
2301  Governor actuator feedback signal is unstable
2302  Governor actuator feedback signal is biased
2303  Governor actuator does not move
2304  Calibration data error
3201  Monitor RAM is abnormal
4101  Too much power to the controller (43 volts)
4102  PRV current is too large
4103  PRV open circuit
4104  Monitor power supply (digital output) over current
4105  Overcurrent in digital output (ditch solenoid valve)
4106  Overcurrent in digital output (fine tuning control solenoid valve)
4107  Overcurrent in digital output (driving speed change solenoid valve)
4108  Overcurrent in digital output (driving alarm)
4109  Spare solenoid 1 (digital output) overcurrent
410A  Overcurrent in digital output (turntable brake solenoid valve)
410B  Spare solenoid 2 (digital output) overcurrent
4201  Abnormal engine speed
4202  Short circuit of engine coolant temperature sensor connected to body ground
4203  Short circuit of hydraulic oil temperature sensor connected to the body ground
4204  Pump delivery pressure PWM sensor shorted to the body ground
4205  Standby PWM sensor 1 connected to the body ground is shorted
4206  Standby PWM sensor 2 connected to the body ground is shorted
4207  Pumping pressure PWM sensor open circuit during power-on
420A  Connected to the body ground fuel sensor open circuit
420B  The fuel sensor connected to the battery voltage is open or shorted
420C  Power supply is too low (less than 23 volts)
420D  Power supply is too high (above 32 volts)
420E  Engine speed knob is not in one of 10 specified positions
4301  Alternator and speed sensor data does not match 1 (alternator abnormality)
4302  Alternator and speed sensor data does not match 2 (speed sensor error)
4303  Engine stall
A201  Monitor communication is abnormal
A202  The monitor responds to the controller for too long a signal
A203  Communication abnormality in the controller
A20D  ADEM communication interrupt

Cat 330C excavator partial fault code

error 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 country 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 check
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 heating relay
1627 Fuel pump relay
0091  Throttle position signal
0096  Fuel level sensor
0110 Engine coolant temperature sensor
0167 generator
0168 Key gate voltage
0190  speed sensor
0248  CAT data line
0286  Engine oil pressure low signal
0374  Rotary brake solenoid valve
0376  Walking warning
0581 Power shift proportional pressure reducing valve
0586 Engine speed disc switch
0587 Regulator transmission 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 line walking solenoid valve
1590 Negative flow control proportional solenoid valve
FMI fault code FMI fault description
0 The data is correct but above the normal range
1 The data is correct but below the normal range
2 Data is unstable, intermittent or incorrect
3 The voltage is higher than normal or suddenly high
4 Voltage is lower than normal or suddenly low
5 Current is lower than normal or open circuit
6 Current is higher than normal or short circuit
7 The machine system did not respond correctly
8 Abnormal frequency, pulse or period
9 Abnormal update
10 Abnormal rate of change
11 Failure mode cannot be confirmed
12 Bad device or component
13 Out of calibration range
14-31 Reserved

Cat 320D excavator partial fault code e Only

error
code
Fault description
00  The data is valid but higher than the normal running value
01  Data is valid but below normal operating value
02  Signal error (data is unstable, intermittent or error)
03  Voltage is higher than normal
04  Voltage is lower than normal
05  Current is lower than normal
06  Current is higher than normal
07  Mechanical system reaction is not normal
08  Signal anomaly (frequency, pulse width or period anomaly)
9 Update exception
10 Abnormal rate of change
11  Failure to identify failure mode
12  Equipment or component damage
13 Calibration failed
14  Parallel metering fault
15  Parallel metering fault
16  Parallel metering is invalid
17  Module (program) did not respond
18  Sensor power failure
19  Receive 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 line
0247  SAE J1939 data cable
0248  Caterpillar data line
0254  Electronic Control Module (ECM)
0262  Sv sensor power supply
0271  alarm system
0291  Engine cooling fan solenoid valve
0362  Engine variable speed fan control solenoid valve
0374  Rotary brake solenoid valve
0485  Engine fan recovery solenoid valve
0544  Engine cooling fan shift solenoid valve
0581  Power shift pressure proportional solenoid valve
0586  Engine throttle disc
0588  Instrument display system
0590  ECM
0598  Walking speed switching solenoid valve
0600  Hydraulic oil temperature sensor
0735  Heavy duty lift solenoid valve
1129  Right accessory pedal sensor
1130  Left accessory pedal sensor
1160  Hydraulic lock solenoid valve
1178  Mechanical overload warning pressure sensor
1522  No. 2 relief valve check valve solenoid valve
1523  No. 1 relief valve check valve solenoid valve
1525  Straight line walking solenoid valve
1590  Main hydraulic pump output limit pressure solenoid valve
1593  No. 1 accessory valve extends pressure solenoid valve
1594  Auxiliary valve No. 2 extends pressure solenoid valve
1595  Auxiliary valve pressure solenoid valve No. 3
1596  No. 1 accessory valve retracts pressure solenoid valve
1597  No. 2 accessory valve retracting pressure solenoid valve
1598  Auxiliary valve No. 3 cancels the pressure solenoid valve
1609  F2 mode valve loop 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 loop
2265  Pump output pressure sensor
2266  Pump output pressure sensor 2
2275  Breaker oil return route control (straight through tank) solenoid valve
2280  Walking alarm relay
2300  switch panel

Cat C9 partial fault code

error code Fault description
112  Accelerator pedal 1 failure
113  Accelerator pedal and brake pedal signals are not trusted
116  Clutch signal failure
117  Brake pedal failure
119  15 terminal failure
11C  Fuel filter water reservoir
211  Vehicle speed sensor failure
215  Cruise control button irreversible failure
125  Main relay 2 failed
126  Battery voltage failure
127  Engine brake failure
128  Main relay 1 is shorted to the battery
129  Main relay 3 failure
12A  Engine brake (main relay 4) failure
12B  Air heater 1 Power Stage failure
12E  Preheating control system failure
225  Main relay failure (interrupted after shutdown)
228  Main relay 1 is shorted to ground
131  Coolant temperature sensor
132  Coolant temperature sensor dynamic failure
133  B intake air 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 is too low
23A  Oil temperature is 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 failure
14A  Engine cabin start button issuance
14D  Tip: Engine overspeed protection
24A  Engine cabin stop button issuance
152  Common rail pressure positive deviation is too high and fuel flow set value is too high
153  Common rail pressure negative deviation too high (minimum flow)
154  Common rail pressure is below the minimum limit
155  Common rail pressure is greater than the maximum limit
156  Common rail fuel pressure drop rate is too high
157  Common speed metering valve is not true when S is overspeed
158  Common rail metering device fuel flow set point is too low
159  Common rail oil pump metering valve Power Stage failure
259  Common rail metering valve positive short circuit
359  Common rail metering valve negative short circuit
161  1st cylinder injector failure
162  2nd cylinder injector failure
163  3rd cylinder injector failure
164  4th cylinder injector failure
165  The fifth cylinder injector malfunction
166  6th cylinder injector failure
167  The first cylinder injector is open
168  The second cylinder injector is open
169  3rd cylinder injector open circuit
16A  4th cylinder injector open circuit
16B  5th cylinder injector open circuit
16C  6th cylinder injector open circuit
16E  The minimum number of injection cylinders has not been reached
171  Injector cable 1 failure
172  I injector cable 2 failure
17C  Injector control unit of ECU: CY33X(1) fault
27C  Injector control unit of ECU: CY33X(2) fault
19E  Limit torque value to reduce smoke
29D  Because of the negative torque, the torque limit is generated.
39E  Because the booster protection creates a torque limit
49E  Torque is limited due to engine protection
69E  Torque is limited due to the fuel injection system’s fuel injection limit

The above is the reason for the frequent fault failures. If you want to know more about the specific causes and troubleshooting of more faults, The above is the reason for the frequent fault failures. If you want to know more about the specific causes and troubleshooting of more faults or learn more about the product of Caterpillar, Please contact us!

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