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Komatsu Engines Fault Codes List: 441 to 6263

Page 8 of 11 of the full Komatsu Engines fault code list (1,067 codes). Each entry is the code as the machine reports it and what the manufacturer data says it means.

Komatsu Engines codes 441 to 6263

  • 441Battery 1 Voltage - Data Valid but Below Normal Operational Range - Moderately Severe Level
  • 442Battery 1 Voltage - Data Valid but Above Normal Operational Range - Moderately Severe Level
  • 443Accelerator Pedal or Lever Position Sensor Supply Voltage Circuit - Voltage Below Normal or Shorted to Low Source
  • 4431Aftertreatment Diesel Exhaust Fluid Controller - Out of Calibration
  • 4452Aftertreatment 1 Outlet NOx - Mechanical System Not Responding or Out of Adjustment
  • 4484Engine Air Shutoff Circuit - Mechanical System Not Responding or Out of Adjustment
  • 449Injector Metering Rail 1 Pressure - Data Valid But Above Normal Operating Range - Most Severe Level
  • 449 (B)Injector Metering Rail Number 1 Pressure - Data Valid But Above Normal Operating Range - Most Severe Level
  • 451Injector Metering Rail Number 1 Pressure Sensor Circuit - Voltage Above Normal or Shorted to High Source
  • 4517Vehicle Identification Number - Out of Calibration
  • 452Injector Metering Rail Number 1 Pressure Sensor Circuit - Voltage Below Normal or Shorted to Low Source
  • 4526Brake Pedal Position - Data Erratic, Intermittent, or Incorrect
  • 4572Aftertreatment 1 Diesel Exhaust Fluid Tank Temperature - Abnormal Update Rate
  • 4584Aftertreatment Diesel Particulate Filter System - Special Instructions
  • 4585Aftertreatment 1 SCR Catalyst System - Special Instructions
  • 4616 (HD)Intake Manifold 1 Pressure - Data Valid But Below Normal Operating Range - Least Severe Level
  • 4616 (HEAVY DUTY)Intake Manifold 1 Pressure - Data Valid But Below Normal Operating Range - Least Severe Level
  • 4642Water in Fuel Indicator - Data Valid But Above Normal Operating Range - Most Severe Level
  • 4677Aftertreatment 1 Diesel Exhaust Fluid Tank Level - Abnormal Update Rate
  • 471Engine Oil Level — Data Valid But Below Normal Operational Range — Least Severe Level
  • 4721Vehicle Identification Number - Condition Exists
  • 4722Vehicle Identification Number - Data Erratic, Intermittent, or Incorrect
  • 4724Auxiliary Input/Output 2 Circuit - Current Below Normal or Open Circuit
  • 4725Auxiliary Input/Output 2 Circuit - Current Above Normal or Grounded Circuit
  • 4734Auxiliary Input/Output 1 - Special Instructions
  • 4769Aftertreatment 1 Diesel Exhaust Fluid Tank Level Sensor - Abnormal Rate of Change
  • 477Battery 2 Voltage - Data Valid But Below Normal Operating Range - Moderately Severe Level
  • 478Battery 2 Voltage - Data Valid But Above Normal Operating Range - Moderately Severe Level
  • 4789Fan Speed - Data Valid But Above Normal Operating Range - Most Severe Level
  • 4791Fan Speed - Data Valid But Below Normal Operating Range - Most Severe Level
  • 483Injector Metering Rail 2 Pressure Sensor Circuit - Voltage Above Normal or Shorted to High Source
  • 484Injector Metering Rail 2 Pressure Sensor Circuit - Voltage Below Normal or Shorted to Low Source
  • 4863Aftertreatment SCR Operator Inducement Active - Condition Exists
  • 488Intake Manifold 1 Temperature - Data Valid but Above Normal Operational Range - Moderately Severe Level
  • 489Transmission Output Shaft Speed - Data Valid But Below Normal Operating Range - Moderately Severe Level
  • 4951Maintain ECU Power Lamp Circuit - Voltage Above Normal or Shorted to High Source
  • 4952Maintain ECU Power Lamp Circuit - Voltage Below Normal or Shorted to Low Source
  • 497Multiple Unit Synchronization Switch - Data Erratic, Intermittent, or Incorrect
  • 498Engine Oil Level Sensor Circuit - Voltage Above Normal or Shorted to High Source
  • 499Engine Oil Level Sensor Circuit - Voltage Below Normal or Shorted to Low Source
  • 5Exhaust Gas Temperature Sensor Number 1 Circuit - Voltage Below Normal, or Shorted to Low Source
  • 515Sensor Supply 6 Circuit - Voltage Above Normal or Shorted to High Source
  • 516Sensor Supply 6 Circuit - Voltage Below Normal or Shorted to Low Source
  • 5221Engine Air Shutoff Status - Data Erratic, Intermittent, or Incorrect
  • 523Auxiliary Intermediate (PTO) Speed Switch Validation - Data Erratic, Intermittent, or Incorrect
  • 527Auxiliary Input - Output 2 Circuit - Voltage Above Normal or Shorted to High Source
  • 5278Aftertreatment 1 Diesel Exhaust Fluid Dosing System Frozen - Condition Exists
  • 528Auxiliary Alternate Torque Validation Switch - Data Erratic, Intermittent, or Incorrect
  • 529Auxiliary Input - Output 3 Circuit - Voltage Above Normal or Shorted to High Source
  • 533Injector Metering Rail 1 Pressure - Data Valid But Above Normal Operating Range - Moderately Severe Level
  • 5383Aftertreatment 1 Diesel Particulate Filter Ash Load Percent - Data Valid But Above Normal Operating Range - Least Severe Level
  • 5383 (BCL)Aftertreatment 1 Diesel Particulate Filter Ash Load Percent - Data Valid But Above Normal Operating Range - Least Severe Level
  • 5383 (ISB, ISC, ISL)Aftertreatment 1 Diesel Particulate Filter Ash Load Percent - Data Valid But Above Normal Operating Range - Least Severe Level
  • 5383 (ISX)Aftertreatment 1 Diesel Particulate Filter Ash Load Percent - Data Valid But Above Normal Operating Range - Least Severe Level
  • 5383 (X)Aftertreatment 1 Diesel Particulate Filter Ash Load Percent - Data Valid But Above Normal Operating Range - Least Severe Level
  • 545Turbocharger 1 Wastegate Control — Mechanical System Not Responding Properly or Out of Adjustment
  • 546Fuel Delivery Pressure Sensor Circuit - Voltage Above Normal or Shorted to High Source
  • 547Fuel Delivery Pressure Sensor Circuit - Voltage Below Normal or Shorted to Low Source
  • 551 (ISS)Accelerator Pedal or Lever Idle Validation Circuit - Voltage Below Normal or Shorted to Low Source
  • 551 (NISS)Accelerator Pedal or Lever Idle Validation Circuit - Voltage Below Normal or Shorted to Low Source
  • 551 (SSS)Accelerator Pedal or Lever Idle Validation Circuit - Voltage Below Normal or Shorted to Low Source
  • 553Injector Metering Rail 1 Pressure - Data Valid but Above Normal Operational Range - Moderately Severe Level
  • 554Injector Metering Rail 1 Pressure - Data Erratic, Intermittent, or Incorrect
  • 555Crankcase Pressure - Data Valid but Above Normal Operational Range - Moderately Severe Level
  • 556Crankcase Pressure - Data Valid But Above Normal Operating Range - Most Severe Level
  • 5576Engine Air Filter Differential Pressure - Data Valid But Above Normal Operating Range - Least Severe Level
  • 5585High Pressure Common Rail Fuel Pressure Relief Valve - Data Valid But Above Normal Operating Range - Least Severe Level
  • 559Injector Metering Rail 1 Pressure - Data Valid But Below Normal Operating Range - Moderately Severe Level
  • 559 (B)Fuel Pump Delivery Pressure Low - Data Valid but Below Normal Operational Range - Moderately Severe Level
  • 559 (CL)Injector Metering Rail 1 Pressure - Data Valid but Below Normal Operational Range - Moderately Severe Level
  • 559 (ISB)Injector Metering Rail 1 Pressure - Data Valid But Below Normal Operating Range - Moderately Severe Level
  • 559 (ISC, ISL)Injector Metering Rail 1 Pressure - Data Valid But Below Normal Operating Range - Moderately Severe Level
  • 559 (ISX)Injector Metering Rail 1 Pressure - Data Valid But Below Normal Operating Range - Moderately Severe Level
  • 559 (X)Injector Metering Rail 1 Pressure - Data Valid But Below Normal Operating Range - Moderately Severe Level
  • 5622Engine Torque Limit Feature - Condition Exists
  • 5653SCR Operator Inducement Override Switch - Abnormal Update Rate
  • 5654SCR Operator Inducement Override Switch - Out of Calibration
  • 5715Aftertreatment 1 Diesel Particulate Filter Differential Pressure Sensor - Abnormal Rate of Change
  • 5716Aftertreatment Diesel Particulate Filter Outlet Pressure - Abnormal Rate of Change
  • 584Engine Starter Motor Relay Circuit - Voltage Above Normal or Shorted to High Source
  • 585Engine Starter Motor Relay Circuit - Voltage Below Normal or Shorted to Low Source
  • 5938Aftertreatment 1 Diesel Particulate Filter Conditions Not Met for Active Regeneration - Special Instructions
  • 5939Machine Constrained Operation - Abnormal Update Rate
  • 5941Machine Constrained Operation - Received Network Data in Error
  • 595Turbocharger 1 Speed - Data Valid But Above Normal Operating Range - Moderately Severe Level
  • 595 (B)Turbocharger Number 1 Speed High - Warning Level
  • 595 (CL)Turbocharger Number 1 Speed High - Data Valid but Above Normal Operational Range - Moderately Severe Level
  • 596Electrical Charging System Voltage High - Data Valid But Above Normal Operating Range - Moderately Severe Level
  • 597Electrical Charging System Voltage Low - Data Valid But Below Normal Operating Range - Moderately Severe Level
  • 598Electrical Charging System Voltage Low - Data Valid But Below Normal Operating Range - Most Severe Level
  • 599Auxiliary Commanded Dual Output Shutdown - Special Instructions
  • 6Exhaust Gas Temperature Sensor Number 1 Circuit - Voltage Above Normal, or Shorted to High Source
  • 611Engine Shut Down Hot - Condition Exists
  • 6256Battery 1 Voltage - Data Valid But Above Normal Operating Range - Least Severe Level
  • 6257Battery 1 Voltage - Data Valid But Below Normal Operating Range - Least Severe Level
  • 6258Electric Lift Pump for Engine Fuel Supply - Voltage Above Normal or Shorted to High Source
  • 6259Electric Lift Pump for Engine Fuel Supply - Voltage Below Normal or Shorted to Low Source
  • 6261Engine Starter Motor Relay Circuit - Voltage Above Normal or Shorted to High Source
  • 6262Engine Starter Motor Relay Circuit - Voltage Below Normal or Shorted to Low Source
  • 6263Fan Control Circuit - Voltage Above Normal or Shorted to High Source
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