CAT Fault Codes | Caterpillar Engine Errors And Trouble Codes

Cat Diagnostic codes are used by the electronic system in order to alert the operator that a problem exists. A diagnostic code also indicates the nature of the problem for you, and you can see what is the code meaning with Catfaultcode.com service.

Cat DTC :

CAT Engine

Cat diagnostic code information that follows is utilized by Caterpillar machines that are equipped with Caterpillar electronic controls.Component identifiers, failure mode identifiers, and module identifiers are pieces of information that assist service personnel in diagnosing system problems of the machine.

Cat Heavy Trucks Common Faults and Fault Code Check Process: Understanding FMI, CID, and MID Codes

Caterpillar, widely recognized for its heavy-duty trucks and machinery, has a well-established reputation in the construction and industrial sectors. Like all vehicles, Cat trucks can experience faults and malfunctions in their various systems. To make diagnosing and repairing these issues more efficient, Caterpillar utilizes diagnostic codes such as Component Identifiers (CID), Failure Mode Identifiers (FMI), and Message Identifiers (MID). In this article, we will discuss some common faults found in Cat heavy trucks and the fault code check process.

A component identifier (CID) is a diagnostic code that informs the service personnel of the specific circuit or system within which a problem was detected.CAT CID Code List

A failure mode identifier (FMI) is a diagnostic code that informs the service personnel of the type of problem that has been detected within a circuit or system.CAT FMI Code List

A module identifier (MID) is a diagnostic code that identifies the electronic control module that has diagnosed a fault.CAT MID Code List

Common Faults in Cat Heavy Trucks:

  • Engine-related issues: Engine problems are prevalent in heavy-duty trucks and can range from minor issues like fuel delivery problems to severe concerns like complete engine failure. Common engine faults include abnormal engine oil pressure, high coolant temperature, and injector malfunctions.
  • Transmission problems: The transmission is a critical component of any truck, and Cat trucks are no exception. Faults in the transmission can lead to poor performance, gear slipping, and even complete failure. Some common transmission issues are low fluid levels, incorrect fluid type, or electronic control module malfunctions.
  • Braking system issues: The braking system is vital for the safe operation of a heavy truck. Problems with the brake system can lead to reduced braking performance or even a complete loss of braking ability. Common faults include worn brake pads, damaged rotors, and brake fluid leaks.
  • Electrical system problems: The electrical system in a Cat truck is responsible for powering various components, including the engine, lighting, and accessories. Electrical faults can cause components to malfunction or stop working altogether. Common issues include alternator failure, dead batteries, and wiring issues.
  • Fault Code Check Process:

    When a fault occurs in a Cat heavy truck, the electronic control module (ECM) records the issue as a diagnostic code. These codes consist of CIDs, FMIs, and MIDs, which help service technicians identify the specific problem and its location within the truck's systems. To read these codes, a diagnostic scan tool is connected to the vehicle's diagnostic port.

    1. Component Identifiers (CID): CID codes identify the specific circuit or system where the problem has occurred. For example, a CID code might indicate an issue with the fuel injector circuit or the transmission control module.
    2. Failure Mode Identifiers (FMI): FMI codes provide more information about the type of problem detected. They describe the failure mode, such as an open circuit, a short circuit, or an out-of-range value.
    3. Message Identifiers (MID): MID codes are used in conjunction with CID and FMI codes to indicate the control module or system that has detected the fault. For example, an MID code might identify that the fault was detected by the engine control module, the transmission control module, or the brake system control module.

    Common CAT Construction Machines Faults :

    Fault Codes For CAT Heavy Machines


    Cat Articulated Fault Codes

    Asphalt Paver

    Cat Asphalt Paver Fault Codes

    Backhole Loader

    Cat Backhole Loader Fault Codes

    Cold Planer

    Cat Cold Planer Fault Codes

    Compact Track And Multi Terrain Loader

    Cat Compact Track And Multi Terrain Loader Fault Codes


    Cat Compactor Fault Codes


    Cat Dozer Fault Codes


    Cat Dragline Fault Codes


    Cat Drill Fault Codes

    Electric Rope Shovel

    Cat Electric Rope Shovel Fault Codes


    Cat Excavator Fault Codes

    Hydraulic Mining Shovel

    Cat Hydraulic Mining Shovel Fault Codes

    Material Handler

    Cat Material Handler Fault Codes

    Motor Grader

    Cat Motor Grader Fault Codes

    Off Highway Truck

    Cat Off Highway Truck Fault Codes

    Pipe Layer

    Cat Pipe Layer Fault Codes

    Road Reclaimer

    Cat Road Reclaimer Fault Codes

    Skid Steer Loader

    Cat Skid Steer Loader Fault Codes


    Cat Telehandler Fault Codes

    Truck Loader

    Cat Truck Loader Fault Codes

    Underground Hard Rock

    Cat Underground Hard Rock Fault Codes

    Underground Longwall

    Cat Underground Longwall Fault Codes

    Wheel Dozer

    Cat Wheel Dozer Fault Codes

    Wheel Excavator

    Cat Wheel Excavator Fault Codes

    Wheel Loader

    Cat Wheel Loader Fault Codes

    Wheel Tractor Scraper

    Cat Wheel Tractor Scraper Fault Codes

    How to check CAT machine&engine code ?

    In most cases it is not necessary to stop the engine because of an intermittent code. However, we recommend that the operator retrieve the code(s) and refer to the chart in order to identify the nature of the event. The operator should note or document the circumstances (low power, vehicle/engine speed limits, excessive smoke, etc) involved during the time the lamp was ON. Documentation may be useful for future reference, and in order to help troubleshoot the situation.

    The YELLOW lamp will flash to indicate a two digit flash code and the SET/RESUME switch may be released. The sequence of flashes represents the system diagnostic message. Count the first sequence of flashes in order to determine the first digit of the diagnostic code. After a two second pause, the second sequence of flashes will identify the second digit of the diagnostic code.

    Understanding the diagnostic codes used in Cat heavy trucks is crucial for efficient maintenance and repair. By being familiar with common faults and the fault code check process, service technicians can quickly identify and resolve issues, minimizing downtime and ensuring the safe operation of these essential vehicles.

    NOTE:Catfaultcode.com indicates the potential effect on engine performance with ACTIVE fault codes.

    About | Contact | Privacy

    Copyright © 2019 All rights reserved. Cat OBD,EDC,DTC and Engine Trouble codes informations.

    Catfaultcode.com is not a part of Cat brand. CAT is a trademark that we trust.