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Komatsu Engines Fault Codes List: 3612 to 436

Page 7 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 3612 to 436

  • 3612Aftertreatment Diesel Exhaust Fluid Dosing Unit - Mechanical System Not Responding or Out of Adjustment
  • 3616Engine Variable Geometry Turbocharger (VGT) Nozzle Position - Mechanical System Not Responding or Out of Adjustment
  • 3633Engine Fan Clutch 2 Control Circuit - Voltage Above Normal or Shorted to High Source
  • 3634Engine Fan Clutch 2 Control Circuit - Voltage Below Normal or Shorted to Low Source
  • 3641Transmission Output Retarder - Abnormal Update Rate
  • 3648Aftertreatment DEF Controller Temperature - Data Valid But Above Normal Operating Range - Moderately Severe Level
  • 3649Aftertreatment 1 Intake NOx Sensor Heater - Abnormal Rate of Change
  • 3651Aftertreatment Diesel Exhaust Fluid Tank Temperature - Data Valid But Below Normal Operating Range - Moderately Severe Level
  • 3679Aftertreatment Diesel Exhaust Fluid Dosing Unit - Root Cause Not Known
  • 3681Aftertreatment 1 Outlet NOx Sensor Power Supply - Data Erratic, Intermittent, or Incorrect
  • 3682Aftertreatment 1 Intake NOx Sensor Power Supply - Data Erratic, Intermittent, or Incorrect
  • 3683Engine Turbocharger 1 Boost Pressure - Mechanical System Not Responding or Out of Adjustment
  • 3697Engine Control Module Calibration Memory - Bad Intelligent Device or Component
  • 3712Aftertreatment SCR Operator Inducement - Data Valid But Above Normal Operational Range - Most Severe Level
  • 3713Aftertreatment Diesel Exhaust Fluid Line Heater Relay - Mechanical System Not Responding or Out of Adjustment
  • 3714Engine Protection Torque Derate - Condition Exists
  • 3715Engine Speed At Idle - Data Valid But Below Normal Operating Range - Moderately Severe Level.
  • 3716Engine Speed At Idle - Data Valid But Below Normal Operational Range - Moderately Severe Level
  • 3717Aftertreatment Outlet NOx Sensor - Out of Calibration
  • 3718Aftertreatment Intake NOx - Out of Calibration
  • 3724Battery 1 Voltage - Data Valid But Below Normal Operating Range - Least Severe Level
  • 3725Aftertreatment 1 Intake NOx Sensor - Abnormal Rate of Change
  • 3726Aftertreatment Intake NOx - Data Valid But Above Normal Operating Range - Moderately Severe Level
  • 3727High-Pressure Common Rail Fuel Pressure Relief Valve - Mechanical System Not Responding or Out of Adjustment
  • 3733Crankcase Breather Filter Heater Circuit - Voltage Above Normal or Shorted to High Source
  • 3734Crankcase Breather Filter Heater Circuit - Voltage Below Normal, or Shorted to Low Source
  • 3736Aftertreatment Diesel Exhaust Fluid Controller - Root Cause Not Known
  • 3737Engine Starter Mode Overcrank Protection - Condition Exists
  • 3741High Pressure Common Rail Fuel Pressure Relief Valve - Data Valid But Above Normal Operating Range - Most Severe Level
  • 3748Aftertreatment 1 Intake NOx Sensor - Data Not Rational - Drifted High
  • 3749Aftertreatment 1 Outlet NOx Sensor - Data Not Rational - Drifted High
  • 3751Aftertreatment SCR Catalyst System - Mechanical System Not Responding or Out of Adjustment
  • 3753Diesel Particulate Filter Active Regeneration Inhibited Due to System Timeout - Condition Exists
  • 3755Aftertreatment Diesel Exhaust Fluid Dosing Valve - Data Erratic, Intermittent, or Incorrect
  • 3765Auxiliary Temperature Sensor Input 2 Circuit - Voltage Above Normal or Shorted to High Source
  • 3766Auxiliary Temperature Sensor Input 2 Circuit - Voltage Below Normal or Shorted to Low Source
  • 3838Estimated Engine Parasitic Losses - Percent Torque - Abnormal Update Rate
  • 3843Cruise Control Disable Command - Abnormal Update Rate
  • 3844Cruise Control Pause Command - Condition Exists
  • 3845Cruise Control Disable Command - Condition Exists
  • 386Sensor Supply Voltage number 1 Circuit - Voltage Above Normal or Shorted to High Source
  • 387Accelerator Pedal or Lever Position Sensor Supply Voltage Circuit - Voltage Above Normal or Shorted to High Source
  • 3917Engine Turbocharger Lube Oil Pressure - Data Valid But Below Normal Operating Range - Moderately Severe Level
  • 4Exhaust Gas Temperature Sensor Number 1 Circuit - Data Erratic, Intermittent, or Incorrect.
  • 412SAE J1587/J1922 Data Link - Can Not Transmit
  • 415Engine Oil Rifle Pressure - Data Valid But Below Normal Operating Range - Most Severe Level
  • 4151Aftertreatment Diesel Particulate Filter Temperature Sensor Module - Abnormal Update Rate
  • 4152Aftertreatment Selective Catalytic Reduction Temperature Sensor Module - Abnormal Update Rate
  • 4155Aftertreatment 1 Diesel Exhaust Fluid Dosing Unit Heater Relay - Voltage Above Normal or Shorted to High Source
  • 4156Aftertreatment 1 Diesel Exhaust Fluid Dosing Unit Heater Relay - Voltage Below Normal or Shorted to Low Source
  • 4157Aftertreatment Diesel Exhaust Fluid Return Valve - Mechanical System Not Responding or Out of Adjustment
  • 4158Aftertreatment Diesel Particulate Filter Temperature Sensor Module - Bad Intelligent Device or Component
  • 4159Aftertreatment Selective Catalytic Reduction Temperature Sensor Module - Bad Intelligent Device or Component
  • 415 (SN)Engine Oil Rifle Pressure - Data Valid but Below Normal Operational Range - Most Severe Level
  • 415 (SW)Engine Oil Rifle Pressure - Data Valid but Below Normal Operational Range - Most Severe Level
  • 4161Aftertreatment Diesel Particulate Filter Temperature Sensor Module - Voltage Above Normal or Shorted to High Source
  • 4162Aftertreatment Diesel Particulate Filter Temperature Sensor Module - Voltage Below Normal or Shorted to Low Source
  • 4163Aftertreatment Diesel Particulate Filter Temperature Sensor Module - Data Valid But Above Normal Operating Range - Moderately Severe Level
  • 4164Aftertreatment Selective Catalytic Reduction Temperature Sensor Module - Voltage Above Normal or Shorted to High Source
  • 4165Aftertreatment Selective Catalytic Reduction Temperature Sensor Module - Voltage Below Normal or Shorted to Low Source
  • 4166Aftertreatment Selective Catalytic Reduction Temperature Sensor Module - Data Valid But Above Normal Operating Range - Moderately Severe Level
  • 4167Aftertreatment Diesel Exhaust Fluid Dosing Unit Heater - Data Erratic, Intermittent, or Incorrect
  • 4168Aftertreatment 1 Diesel Exhaust Fluid Dosing Unit 1 Heater Circuit - Voltage Above Normal or Shorted to High Source
  • 4169Aftertreatment 1 Diesel Exhaust Fluid Dosing Unit Heater - Voltage Below Normal or Shorted to Low Source
  • 4171Aftertreatment 1 Diesel Exhaust Fluid Dosing Unit Heater - Data Valid But Below Normal Operating Range - Moderately Severe Level
  • 418Water-in-Fuel Indicator - Data Valid But Above Normal Operating Range - Least Severe Level
  • 418 (AUTO)Water-In-Fuel Indicator - Data Valid but Above Normal Operational Range - Least Severe Level
  • 418 (MAR)Water-in-Fuel Indicator Data Valid but Above Normal Operational Range - Least Severe Level
  • 421Engine Oil Temperature - Data Valid But Above Normal Operating Range - Moderately Severe Level
  • 4213Aftertreatment Regeneration Inhibit Switch - Data Erratic, Intermittent, or Incorrect
  • 4215Anti-Lock Braking (ABS) Active - Condition Exists
  • 422Coolant Level - Data Erratic, Intermittent, or Incorrect
  • 4244Aftertreatment 1 Diesel Exhaust Fluid Dosing Temperature - Data Erratic, Intermittent, or Incorrect
  • 4245Aftertreatment 1 Diesel Exhaust Fluid Dosing Unit Heater Temperature - Data Erratic, Intermittent, or Incorrect
  • 4249Aftertreatment 1 Diesel Exhaust Fluid Dosing Temperature - Abnormal Rate of Change
  • 425Engine Oil Temperature - Data Erratic, Intermittent, or Incorrect
  • 4251Aftertreatment 1 Diesel Exhaust Fluid Dosing Unit Heater Temperature - Abnormal Rate of Change
  • 4259Aftertreatment Diesel Particulate Filter Temperature Sensor Module - Root Cause Not Known
  • 426J1939 Network #1 - Data Erratic, Intermittent, or Incorrect
  • 4261Aftertreatment Selective Catalytic Reduction Temperature Sensor Module - Root Cause Not Known
  • 427SAE J1939 Data Link - Abnormal Update Rate
  • 428Water in Fuel Indicator Sensor Circuit - Voltage Above Normal or Shorted to High Source
  • 428 (AUTO)Water-in-Fuel Indicator Sensor Circuit - Voltage Above Normal or Shorted to High Source
  • 428 (MAR)Water-in-Fuel Indicator Sensor Circuit - Voltage Above Normal or Shorted to High Source
  • 429Water-in-Fuel Indicator Sensor Circuit - Voltage Below Normal or Shorted to Low Source
  • 4293Engine Brake Active Lamp – Voltage Above Normal or Shorted to High Source
  • 4294Engine Brake Active Lamp – Voltage Below Normal or Shorted to Low Source
  • 429 (AUTO)Water-in-Fuel Indicator Sensor Circuit - Voltage Below Normal or Shorted to Low Source
  • 429 (MAR)Water-in-Fuel Indicator Sensor Circuit - Voltage Below Normal or Shorted to Low Source
  • 431Accelerator Pedal or Lever Idle Validation Switch - Data Erratic, Intermittent, or Incorrect
  • 431 (ISS)(Integrated Sensor Switch) Accelerator Pedal or Lever Idle Validation Switch - Data Erratic, Intermittent, or Incorrect
  • 431 (NISS)(Nonintegrated Sensor Switch) Accelerator Pedal or Lever Idle Validation Circuit - Data Erratic, Intermittent, or Incorrect
  • 431 (SSS)Accelerator Pedal or Lever Idle Validation Circuit - Data Erratic, Intermittent or Incorrect
  • 432Accelerator Pedal or Lever Idle Validation Switch Circuit - Out of Calibration
  • 433Intake Manifold Pressure Sensor Circuit - Data Incorrect
  • 434Power Supply Lost With Ignition On - Data Erratic, Intermittent or Incorrect
  • 435Engine Oil Rifle Pressure - Data Erratic, Intermittent, or Incorrect
  • 435 (Sensor)Engine Oil Rifle Pressure - Data Erratic, Intermittent, or Incorrect
  • 435 (Switch)Engine Oil Rifle Pressure - Data Erratic, Intermittent, or Incorrect
  • 436Intake Manifold 1 Temperature - Data Erratic, Intermittent, or Incorrect
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