5/26/23, 8:37 AM SIS 2.

2021/02/23 Event Codes (M0102837-00)

SMCS - 7569 i07831320

Event codes alert the operator or the technician that an abnormal operating condition
exists in one of the machine systems.
PSP
202 -0002
When the Machine ECM or the Implement ECM activates an event code, the operator or the
technician will be alerted. Most active events will be logged by the ECM. Some events are not

3
01: /05/2 2659
logged to the ECM. The active events and the logged events can be viewed with the Operator
Monitor or the Cat® Electronic Technician (Cat ET) Service Tool.

Warning Levels
3
M0 7:45+ 6
1
© 2 0283 07:00
The ECM assigns one of the three warning levels to an active event code according to the severity
of the abnormal system condition. Each warning level requires a specific response from the operator.

023 7
The warning levels and required operator response are listed below.

Warning Level 1 Cat

erp
illa
Warning Level 1 alerts the operator that a machine system requires attention. The operator should

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check the involved system. Perform any necessary maintenance to the system at the earliest
possible time.

Warning Level 2
c.
Warning Level 2 requires changing the operation of the machine or performing a maintenance
procedure. Failure to correct the problem behind this warning will damage the components that are
involved. The problem that caused the event requires correction, before the machine can resume
operation.

Warning Level 3
Warning Level 3 requires an immediate safe shutdown of the machine to avoid damage to the
machine or injury to personnel around the machine. The problem that caused the event must be
corrected before machine operation can resume.

Indications and System Response

Message
Table 1

WARNING OPERATION 

Warning Warning Indications  Action by the Possible

Level  operator is Result (1) 
Warning Warning Sounding
required. 
Indicators for Lamp  of the
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the Action
Subsystem Alarm 
1  OFF  No immediate No harmful,
action is required. damaging effects
OFF  OFF 
The system needs result. 
attention soon. 
2  Flashing Change machine The system
Amber  operation or components are
ON  OFF  perform damaged. 
maintenance to the
system. 
3  Flash Pulse ON and Immediately The operator is
Red.  OFF.  perform a safe injured or the
ON 
engine shutdown.  components are
damaged. 
(1)
(if no action is taken by the operator).

Cat Electronic Technician (Cat ET) Service Tool

When an abnormal operating condition occurs, the status screen on the Operator Monitor or Cat
ETCat ET indicates that there is an active event.

Event codes are displayed on Cat ET or the monitor in the following format:

EXXXX Description of the code

The "E" means that the code is an event code. The "XXXX" is a numeric identifier. The numeric
identifier is followed by a description of the code.

Active event codes are listed in ascending numerical order. The code with the lowest number is
listed first. The active event code is removed from the list when the condition is no longer present.

Logged Event Codes

Some event codes are logged in the ECM memory. Some event codes are active only. The logged
event codes are listed in chronological order. The most recent code is listed first.

A logged code is cleared from memory when one of the following conditions occur:

The service technician manually clears the code.

The code does not reoccur for 1000 hours.

A new code is logged and there are already ten logged codes in memory. In this case, the oldest
logged code is cleared.

Note: Always clear logged event codes after investigating and correcting the problem which
generated the code.

Troubleshooting
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Perform the following steps to troubleshoot an event:

1. Obtain the following information from the operator monitor and the machine operator:

The event and the time of the event.

Determine the operating conditions for the engine at the time of the event. Conditions such
as engine RPM and load may be important.

Determine if there are any systems that were installed by the dealer or by the customer that
could cause the event.

2. Some of the events below can become active during normal system operation. Verify that the
event is not due to error of the operator.

3. Check all fluid levels and all oil levels.

4. Troubleshoot and repair any active diagnostic codes.

Machine ECM Event Code List

The following table lists the event codes that apply to the control system of the Machine The
recommended response is listed. Use the Cat ET service tool to determine the event codes that are
active or logged.

Table 2

Machine System Event Identifier (EID) Codes 

EID
Description  Possible Cause/Recommended Response 
(Level) 
Immediate Safe Engine Shutdown is required
Indicates that the transmission output speed has exceeded speeds
that are acceptable for internal transmission components.
During machine retarding with increased output speeds of the
engine, torque converter, and transmission, the transmission output
Transmission Over speed has exceeded 3180 RPM for 0.5 seconds.
E83 (3) 
Speed 
Probable Cause:
Incorrect gear for Grade

Recommendation:
Send engineering data transport file to engineering. 
E155 High Torque Probable Cause:
(2)  Converter Oil Excessive machine operation conditions. Event is logged when the
Temperature  torque converter oil (TCO) temperature exceeds 129° C (264° F) for
10 seconds.

Recommendation:
Change machine operation to allow TCO to cool. If needed, park the
machine and set engine at high idle until TCO temp event clears.
Once activated, the level 2 event will not become inactive until the
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TCO temp reduces to less than 123° C (255° F) for 5 seconds.

Enable "Enhanced Autoshift" for more appropriate gear usage
during excessive machine operations. 
Immediate Safe Shutdown Is Required

Probable Cause:
Excessive machine operation conditions. Event is logged when the
temperature of the T/C oil has reached a critical level of 135 °C
(275 °F) for 30 seconds.

Recommendation:
Allow T/C oil to cool. Park the machine and set engine at high idle
High Torque
E155 until T/C oil temp event clears.
Converter Oil
(3)  Investigate the reason for the high TCO temp. Check other
Temperature 
machines in similar applications to see if site conditions are the
cause.
Enable "Enhanced Autoshift" for more appropriate gear usage
during excessive machine operations.

Use Cat ET datalogger to find contributing conditions, such as gear,

machine speed, and throttle position.
If transmission oil, engine coolant and inlet air temperatures are also
higher, then dirty cooler cores could be the problem. 
Immediate Safe Shut Down of Machine is Required.

Probable Cause:
This code could be the result of a failure of a physical or an
E192 Steering System electrical component.
(3)  Malfunction 
Recommendation:
Perform a visual inspection of steering linkages. Use Cat ET to
determine if any diagnostic codes related to steering are active or
logged. Correct all diagnostic codes. 
Probable Cause:
The engine did not start within the programmed parameters for
E225 engine starting.
Engine Overcrank 
(2) 
Recommendation:
Troubleshoot for Engine Overcrank Occurrences. 
E256 Steering Output Immediate Safe Shut Down of Machine is Required.
(3)  Detected in Wrong
Direction  Probable Cause:
Usually occurs after servicing.
Hydraulic hose connections are reversed. - Electrical connections of
the secondary solenoid are reversed. - Hydraulic steering valve is
malfunctioning

Recommendation:
Check for and clear any active CID 1469 or CID 1470 diagnostic
codes for the steering motor speed sensor input signal circuits.
Check the following components for correct wire connections: Left
hand and Right hand steering solenoids and the two steer speed
sensor signal circuits.
Check the following hydraulic components for correct connections

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and operation: Steering pump hydraulic connections, steering pump

operation, and COR valve operation 
Immediate Safe Shut Down of Machine is Required.

Probable Cause:
Activated when steering cylinder movement is detected and the
Steering Output
E257 joystick is not moved.
Detected with No
(3) 
Command Given 
Recommendation:
Cycle the disconnect switch and the key start switch. Start the
machine and determine is this event code is reactivated. Discover
and correct diagnostic codes related to the steering system. 
Immediate Safe Shut Down of Machine is Required.

Probable Cause:
No Steering No steering cylinder movement is detected when commanded.
E258
Detected with
(3) 
Command Given  Recommendation:
Use Cat ET to determine if any diagnostic codes related to the
steering system are active. This problem could also be related to
failure of a physical component, inspect machine for damage. 
Probable Cause:

Activated when steering pump pressure is less than 1000 kPa

(145 psi). The reduced pressure may damage the steering pump.
Recommendation:

Check for and clear any active CID 0473 diagnostic codes for the
charge pressure sensor input signal circuit.

E283 Low Hydraulic Manually check system pressure. Compare to the charge pressure
(2)  Charge Pressure  sensor reading. If values are different by 20% or more, check sensor
circuit for abnormal resistance. If the sensor circuit checks OK,
replace the sensor.

The correct operating pressure is 3050 ± 100 kPa (442.4 ± 14.5 psi.)
Check the system pressure and charge pump pressure setting.

Check the fixed pressure relief valve for sticking open.

Check charge pump for faulty operation. 

E283 Low Hydraulic Immediate Safe Shut Down of Machine is Required.
(3)  Charge Pressure 
Probable Cause:

Activated when steering pump pressure is less than 1000 kPa

(145 psi). The reduced pressure may damage the steering pump.
Recommendation:

Check for and clear any active CID 0473 diagnostic codes for the
charge pressure sensor input signal circuit.

Manually check system pressure. Compare to the charge pressure

sensor reading. If values are different by 20% or more, check sensor
circuit for abnormal resistance. If the sensor circuit checks OK,

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replace the sensor.

The correct operating pressure is 3050 ± 100 kPa (442.4 ± 14.5 psi.)
Check the system pressure and charge pump pressure setting.

Check the fixed pressure relief valve for sticking open.

Check charge pump for faulty operation. 

Probable Cause:
Filter is plugged.

E329 Transmission Filter Recommendation:

(2)  Plugged  Cut filter, inspect for debris, remove suction screen and so on.
Check for a problem with the switch or wiring.
Refer to the Electrical System Schematic and perform the necessary
checks. 
Activates at 109° C (228° F) - Resets at 107° C (225° F)

Trans lube oil temp is calculated by software using the following:

High Transmission
· Power train sump temperature
E594–2  Lube Oil
· Torque converter temperature
Temperature 
· Engine coolant temperature

Check the temperature of the listed systems.

Modify the operating conditions to lower the temperature. 
Immediate Safe Shut Down of Machine is Required.

Probable Cause:
Low Transmission Oil Level. Code is activated when the
E644 Low Transmission transmission oil pressure is below 2400 kPa (348 psi).
(3)  Oil Pressure  Recommendation:
Check the transmission and associated lines for problems such as
leakage. For more information refer to Systems OperationTesting
and Adjusting, M0102843 , "D9 Track-Type Tractor", "Load Piston
- Test and Adjust" 
Probable Cause:
Access ladder lowered with transmission in gear.

Recommendation:
Access Ladder If equipped, raise the ladder to avoid damage and to clear the event.
E680 Lowered with Refer to the following manuals for additional information:
(2)  Transmission in •Systems OperationTesting and Adjusting, M0102843 , "D9 Track-
Gear  Type Tractor" Access Ladder System or Ladder System Pressure
- Test and Adjust
•Troubleshooting Ladder System in this manual
•Operation and Maintenance Manual, M0096785 or M0082951
, "D9 Track-Type Tractor" Access Ladder Operation  
E706 Park Brake Immediate Safe Shut Down of Machine is Required.
(3)  Disabled Due to
System Fault  Probable Cause:
This code will activate if the Park Brake solenoid state and the
pressure do not correspond. The Park Brake pressure is high
(released), and the solenoid is de-energized (Park Brake engaged).

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Recommendation:
Inspect the park brake fluid connections for signs of damage or
leakage.
Check the Park Brake oil for contamination. 
The ECM internal clock is also known as an electronic service hour
meter.

Probable Cause:The Machine ECM hour meter is too far out of

alignment with other ECM hour meters.
Clock Manual
E861
Alignment Recommendation:
(1) 
Required  Use Cat ET to synchronize the ECM hour meters. At the top menu,
select "Service", and "Synchronize Service Hour Meter" from the
drop-down menu. Next, click the "Synchronize" button to
synchronize all the service hour meters on the machine. A pop-up
dialog box will inform you of a successful synchronization of each
ECM. 
Probable Cause:
Event is active when the system voltage is less than 24 VDC for
more than 30 seconds.
Note: The engine must be running for more than 30 seconds for the
code to activate.
E875 Low System
Recommended Action:
(2)  Voltage 
Use Cat ET to identify diagnostic codes related to high voltage. Use
the appropriate troubleshooting procedure to correct the source of
the low voltage. [Or Troubleshoot using Troubleshooting Charging
System - Test in this manual.] The machine returns to normal
operation when the voltage exceeds 24.5 VDC for more than 3
seconds. 
Immediate Safe Shut Down of Machine is Required.

Probable Cause:
Event is active when the system voltage is less than 23 VDC for
more than 10 seconds.
Note: The engine must be running for more than 60 seconds for the
code to activate.
E875 Low System
(3)  Voltage  Recommended Action:
Move the machine to a safe location and shut down the machine.
Use Cat ET to identify diagnostic codes related to high voltage. Use
the appropriate troubleshooting procedure to correct the source of
the low voltage. [Or Troubleshoot using Troubleshooting Charging
System - Test in this manual.] The machine returns to normal
operation when the voltage exceeds 23.5 VDC for more than 3
seconds. 
E876 High System Probable Cause:
(2)  Voltage  Event is active when the system voltage exceeds 30.5 VDC for
more than 10 seconds.

Recommended Action:
Move the machine to a safe location and shut down the machine.
Use Cat ET to identify diagnostic codes related to high voltage. Use
the appropriate troubleshooting procedure to correct the source of

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the excess voltage. The machine returns to normal operation when

the voltage is less than 30 VDC for more than 3 seconds. 
Immediate Safe Shut Down of Machine is Required.

Probable Cause:
Event is active when the system voltage exceeds 32 VDC for more
than 5 seconds.
E876 High System
(3)  Voltage  Recommended Action:
Move the machine to a safe location and shut down the machine.
Use Cat ET to identify diagnostic codes related to high voltage. Use
the appropriate troubleshooting procedure to correct the source of
the excess voltage. The machine returns to normal operation when
the voltage is less than 31.5 VDC for more than 3 seconds. 
The Transmission Inlet Oil Temperature is Higher than 119° C
(246° F) for 10 seconds.

Probable Cause:
There is an Issue with the Transmission Inlet Temp sensor/wiring
resistance.
E877 High Transmission
Transmission oil cooler issue
(2)  Oil Temperature 
Power train system leakage

Recommendation:
Check transmission oil cooler functionality.
Ensure that the engine fan is clear of debris.
Check system pressures for leakage 
Probable Cause:
Access ladder lowered with the park brake disengaged.

Recommendation:
Access Ladder If equipped, raise the ladder to avoid damage and to clear the event.
E1336 Lowered with Park Refer to the following manuals for additional information:
(2)  Brake •Systems OperationTesting and Adjusting, M0102843 , "D9 Track-
Disengaged  Type Tractor" Access Ladder System or Ladder System Pressure
- Test and Adjust
•Troubleshooting Ladder System in this manual
•Operation and Maintenance Manual, M0096785 or M0082951
, "D9 Track-Type Tractor" Access Ladder Operation  
Possible Cause:
Event is active when the system voltage exceeds 32 VDC for more
than 5 seconds.
E1378 High ECM Power
Recommended Response:
(2)  Input Voltage 
The machine returns to normal operation when the voltage exceeds
31.5 VDC for more than 5 seconds. Refer to the Troubleshooting
Electrical Power Supply - Test section within this manual to
correct the problem associated with this event code. 
E1379 Low ECM Power Possible Cause:
(2)  Input Voltage  Event is active when the system voltage is less than 18 VDC for
more than 3 seconds.

Recommended Response:
The machine returns to normal operation when the voltage exceeds
18.5 VDC for more than 5 seconds. Refer to the Troubleshooting
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Electrical Power Supply - Test section within this manual to

correct the problem associated with this event code. 
Probable Cause:
The brake control has conflicting inputs
E1386 Park Brake Control
(2)  Position Mismatch  Recommended Action:
Once the park brake switch is in the APPLY position and both brake
solenoids are OFF the warning will be removed. 
Probable Cause:
Filter is plugged.
E1423 Hydraulic Charge
(2)  Filter Plugged  Recommended Action:
No immediate action required, however the system needs attention
soon. Check and then if needed clean or replace the charge filter. 

Implement ECM Event Code List

The following table lists the event codes that apply to the control system of the Implement The
recommended response is listed. Use the Cat ET service tool to determine the event codes that are
active or logged.

Table 3

Implement System Event Identifier (EID) Codes 

EID
Description  Possible Cause/Recommended Response 
(Level) 
Probable Cause:
The grease level within the Auto Lube attachment is low or has a
bad sensor
E234 Low Auto Lube
(1)  Grease Level 
Recommended Action:
Check for leaks, kinked, or plugged lines, fuse, or pump, refill
grease level then troubleshoot sensor. 
Activated and logged after four of the E234 (1) events occur. Every
time four E234 (1) low-level events occur consecutively, the count
of this fault will continue to rise.
A popup banner will occur with this level 2 fault.
Continued lube pumping is unavailable when this fault is active.
The pump will continue to check if the fault code can be cleared on
the pumps normal operation schedule (set by the user).
E234 Low Auto Lube
(2)  Grease Level 
Probable Cause:
The grease level within the Auto Lube attachment is low or has a
bad sensor.

Recommended Action:
Check for leaks, kinked, or plugged lines, fuse, or pump, refill
grease level then troubleshoot sensor. 
E235 Low Hydraulic Oil Probable Cause:
(1)  Level  Low oil level, broken line, or bad sensor

Recommended Action:
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Check the hydraulic oil level on the liquid indicator gauge on the
side of the tank. Fill if the tank is low. If the gauge shows that the
tank is full, check the hydraulic lines for damage. 
Immediate Safe Engine Shutdown is required

Probable Cause:
Low oil level, broken line, or bad sensor
E235 Low Hydraulic Oil
(3)  Level 
Recommended Action:
Check the hydraulic oil level on the liquid indicator gauge on the
side of the tank. Fill if the tank is low. If the gauge shows that the
tank is full, check the hydraulic lines for damage. 
Probable Cause:
Low grease level, broken line, or bad sensor
E334 Low Auto Lube
(1)  Pressure  Recommended Action:
Check for leaks, kinked, or plugged lines, fuse, or pump, refill
grease level then troubleshoot sensor. 
Possible Cause:
The hydraulic case drain filter is plugged so the oil is being
Hydraulic Case bypassed.
E454
Drain Filter
(2) 
Plugged  Recommended Action:
No immediate action required, however the system needs attention
soon. Clean or replace the hydraulic case drain filter. 
Probable Cause:
Plugged injector, crushed line, or bad sensor.
Auto Lube Pressure Failed or stuck vent valve
E521
Not Decreasing
(1) 
After Cycle  Recommended Action:
Check lines, test injectors, test vent valve, and then troubleshoot
the sensor. 
Probable Cause:
Plugged injector, crushed line, or bad sensor.
Auto Lube Pressure Failed or stuck vent valve
E521
Not Decreasing
(2) 
After Cycle  Recommended Action:
Check lines, test injectors, test vent valve, and then troubleshoot
the sensor. 
The ECM internal clock is also known as an electronic service hour
meter.

Probable Cause:The Implement ECM hour meter is too far out of

alignment with other ECM hour meters.
E861 Clock Manual
Recommended Action:
(1)  Alignment Required 
Use Cat ET to synchronize the ECM hour meters. At the top menu,
select "Service", and "Synchronize Service Hour Meter" from the
drop-down menu. Next, click the "Synchronize" button to
synchronize all the service hour meters on the machine. A pop-up
dialog box will inform you of a successful synchronization of each
ECM. 
E878 High Hydraulic Oil Probable Cause:
(2)  Temperature  System hydraulic temperature exceeds 95 °C (203°F).
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Recommended Action:
Modify machine operation to reduce system load.
Check hydraulic oil level.
Check the hydraulic oil cooling system.
Check hydraulic oil quality. 
Immediate Safe Shutdown Is Required

Probable Cause:
System hydraulic temperature exceeds 100° C (212° F).
E878 High Hydraulic Oil
(3)  Temperature  Recommended Action:
Modify machine operation to reduce system load.
Check hydraulic oil level.
Check the hydraulic oil cooling system.
Check hydraulic oil quality. 
Probable Cause:
Activates when trip conditions for other codes occur and prevent
the system from operating.
E890 Auto Lube System
(2)  Cannot Operate 
Recommended Action:
Refer to System Operation Test and Adjust, M0124845 ,
Automatic Lubrication System for more information. 
Probable Cause:
Filter is plugged.
E1257 Winch Filter
(2)  Plugged  Recommended Action:
No immediate action required, however the system needs attention
soon. Clean or replace the winch filter. 
Possible Cause:
Event is active when the system voltage exceeds 32 VDC for more
than 5 seconds.

E1378 High ECM Power Recommended Response:

(2)  Input Voltage  The machine returns to normal operation when the voltage
exceeds 31.5 VDC for more than 5 seconds. Refer to the
Troubleshooting Electrical Power Supply - Test section within
this manual to correct the problem associated with this event
code. 
Possible Cause:
Event is active when the system voltage is less than 18 VDC for
more than 3 seconds.

E1379 Low ECM Power Recommended Response:

(2)  Input Voltage  The machine returns to normal operation when the voltage
exceeds 18.5 VDC for more than 5 seconds. Refer to the
Troubleshooting Electrical Power Supply - Test section within
this manual to correct the problem associated with this event
code. 
Probable Cause: Seat Belt is unfastened. Triggered when the
Operator Seat Belt seat belt is detected unfastened and the machine is not idle.
E1388
Unfastened While
(1) 
Machine Is Not Idle  Recommended Actions - Ensure that the Operator Seat Belt is
properly fastened. 

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Probable Cause:
Machine or Onboard IMU is in an unacceptable position or bad
Unacceptable sensors.
E1394
Machine
(2) 
Orientation  Recommended Action:
Visually verify that the machine and IMU are correctly positioned.
Restart the system. Then if needed, troubleshoot sensors. 
Immediate Safe Shutdown Is Required

Probable Cause:
Unacceptable Machine or Onboard IMU is in an unacceptable position or bad
E1394
Machine sensors.
(3) 
Orientation 
Recommended Action:
Visually verify that the machine and IMU are correctly positioned.
Restart the system. Then if needed, troubleshoot sensors. 
Probable Cause:
Access ladder lowered with blade movement detected.

Recommendation:
If equipped, raise the ladder to avoid damage and to clear the
Access Ladder
event.
E1397 Lowered with Blade
Refer to the following manuals for additional information:
(2)  Movement
•Systems OperationTesting and Adjusting, M0102843 , "D9
Detected 
Track-Type Tractor" Access Ladder System or Ladder System
Pressure - Test and Adjust
•Troubleshooting Ladder System in this manual
•Operation and Maintenance Manual, M0096785 or M0082951
, "D9 Track-Type Tractor" Access Ladder Operation  
Immediate Safe Shutdown Is Required

Implement Case Probable Cause:

E2147
Drain Filter Filter is plugged.
(3) 
Plugged 
Recommended Action:
Clean or replace the implement case drain filter. 
Probable Cause:
Restricted condenser airflow, restriction on high side of refrigerant
circuit, or too much refrigerant.
E2292 High Air Conditioner
(2)  Discharge Pressure 
Recommended Action:
Refer to the latest version of UENR4125 , "Air Conditioning and
Heating R134a for All Cat Machines" 
Probable Cause:
Restricted evaporator airflow, restriction on low side of refrigerant
circuit, or too little refrigerant.
E2293 Low Air Conditioner
(2)  Suction Pressure 
Recommended Action:
Refer to the latest version of UENR4125 , "Air Conditioning and
Heating R134a for All Cat Machines" 

PSP-00022659
2023/05/26

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i07831320 3
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© 2023 Caterpillar Inc.

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