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Komatsu Engines Fault Codes List: 1669 (3-Wire Sensor) to 1976

Page 2 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 1669 (3-Wire Sensor) to 1976

  • 1669 (3-Wire Sensor)Aftertreatment 1 Diesel Exhaust Fluid Tank Level Sensor Circuit - Voltage Above Normal or Shorted to High Source
  • 1671Catalyst Tank Level — Data Valid but Below Normal Operational Range — Moderately Severe Level.
  • 1673Aftertreatment 1 Diesel Exhaust Fluid Tank Level - Data Valid But Below Normal Operating Range - Most Severe Level
  • 1674Exhaust Gas Temperature 2 Circuit — Voltage Below Normal, or Shorted to Low Source
  • 1675Exhaust Gas Temperature 2 Circuit — Voltage Above Normal, or Shorted to Low Source
  • 1676Exhaust Gas Temperature 2— Data Erratic, Intermittent, or Incorrect
  • 1677Aftertreatment 1 Diesel Exhaust Fluid Tank Temperature Sensor - Voltage Below Normal or Shorted to Low Source
  • 1678Aftertreatment 1 Diesel Exhaust Fluid Tank Temperature Sensor - Voltage Above Normal or Shorted to High Source
  • 1679Aftertreatment Diesel Exhaust Fluid Tank Temperature - Data Erratic, Intermittent, or Incorrect
  • 1681Aftertreatment Diesel Exhaust Fluid Dosing Unit - Bad Intelligent Device or Component
  • 1682Aftertreatment Diesel Exhaust Fluid Dosing Control Unit Input Lines - Condition Exists
  • 1683Aftertreatment 1 Diesel Exhaust Fluid Tank Heater - Voltage Above Normal or Shorted to High Source
  • 1684Aftertreatment 1 Diesel Exhaust Fluid Tank Heater - Voltage Below Normal or Shorted to Low Source
  • 1687Catalyst Over Temperature - Data Valid but Above Normal Operational Range - Most Severe Level
  • 1688Aftertreatment Diesel Exhaust Fluid Controller - Bad Intelligent Device or Component
  • 1689Real-Time Clock Power Interrupt - Data Erratic, Intermittent or Incorrect
  • 1691Aftertreatment Diesel Oxidation Catalyst Conversion Efficiency - Data Valid But Below Normal Operating Range - Moderately Severe Level
  • 1691 (BCL)Aftertreatment Diesel Oxidation Catalyst Conversion Efficiency - Data Valid But Below Normal Operating Range - Moderately Severe Level
  • 1691 (ISB, ISC, ISL)Aftertreatment Diesel Oxidation Catalyst Conversion Efficiency - Data Valid But Below Normal Operating Range - Moderately Severe Level
  • 1691 (ISX)Aftertreatment Diesel Oxidation Catalyst Conversion Efficiency - Data Valid But Below Normal Operating Range - Moderately Severe Level
  • 1691 (X)Aftertreatment Diesel Oxidation Catalyst Conversion Efficiency - Data Valid But Below Normal Operating Range - Moderately Severe Level
  • 1692Aftertreatment Outlet NOx Sensor - Voltage Below Normal, or Shorted to Low Source
  • 1694Aftertreatment Outlet NOx Sensor - Data Erratic, Intermittent, or Incorrect
  • 1695Sensor Supply 5 - Voltage Above Normal or Shorted to High Source
  • 1696Sensor Supply 5 - Voltage Below Normal or Shorted to Low Source
  • 1697Aftertreatment #1 Air Enable Actuator — Voltage Above Normal, or Shorted to High Source.
  • 1698Aftertreatment #1 Air Enable Actuator — Voltage Below Normal, or Shorted to Low Source.
  • 1699Catalyst Tank Level Sensor — Data Erratic, Intermittent, or Incorrect.
  • 1711Dosing Control Unit Data Link — Abnormal Update Rate
  • 1712Aftertreatment 1 Diesel Exhaust Fluid Tank Heater - Data Valid But Below Normal Operating Range - Moderately Severe Level
  • 1713Aftertreatment 1 Diesel Exhaust Fluid Tank Heater - Data Valid But Above Normal Operating Range - Moderately Severe Level
  • 1716Auxiliary Temperature Sensor Input 1 Circuit - Root Cause Not Known
  • 1717Exhaust Gas Temperature 1 — Data Valid but Above Normal Operational Range — Least Severe Level
  • 1718Engine Misfire for Multiple Cylinders — Condition Exists.
  • 1774Engine Oil Priming Pump Control Circuit - Voltage Above Normal or Shorted to High Source
  • 1843Crankcase Pressure Circuit - Voltage Above Normal or Shorted to High Source
  • 1844Crankcase Pressure Circuit - Voltage Below Normal or Shorted to Low Source
  • 1845Water-in-Fuel Indicator Sensor Circuit - Voltage Above Normal or Shorted to High Source (For Generator Engines Only)
  • 1846Water-in-Fuel Indicator Sensor Circuit - Voltage Below Normal or Shorted to Low Source (For Generator Engines Only)
  • 1847Engine Coolant Temperature - Special Instructions
  • 1848Intake Manifold 1 Temperature — Abnormal Rate of Change
  • 1849Exhaust Gas Temperature 1 — Abnormal Rate of Change
  • 1851Exhaust Gas Temperature 2 — Abnormal Rate of Change
  • 1852Water In Fuel Indicator - Data Valid but Above Normal Operational Range - Moderately Severe Level
  • 1866Exhaust Gas Recirculation Differential Pressure - Data Erratic, Intermittent, or Incorrect
  • 1867Exhaust Gas Recirculation Temperature - Data Erratic, Intermittent, or Incorrect
  • 187Sensor Supply 2 Circuit - Voltage Below Normal or Shorted to Low Source
  • 1879Aftertreatment Diesel Particulate Filter Differential Pressure Sensor Circuit - Voltage Above Normal or Shorted to High Source
  • 187 (B)Sensor Supply Voltage Number 2 Circuit - Voltage Below Normal or Shorted to Low Source
  • 187 (BM)Sensor Supply 2 Circuit - Voltage Below Normal, or Shorted to Low Source
  • 1881Aftertreatment Diesel Particulate Filter Differential Pressure Sensor Circuit - Voltage Below Normal or Shorted to Low Source
  • 1883Aftertreatment Diesel Particulate Filter Differential Pressure Sensor - Data Erratic, Intermittent, or Incorrect
  • 1885Aftertreatment 1 Intake NOx Sensor Circuit - Voltage Below Normal or Shorted to Low Source
  • 1887Aftertreatment 1 Outlet NOx Sensor Circuit - Voltage Below Normal or Shorted to Low Source
  • 1888Multiplexed Accelerator Pedal or Lever Sensor System - Received Network Data In Error
  • 1889SAE J1939 Multiplexing Remote Accelerator Pedal or Lever Sensor System - Received Network Data In Error
  • 1891Engine Oil Change Interval - Condition Exists
  • 1892Wheel-Based Vehicle Speed — Data Valid but Below Normal Operational Range — Moderately Severe Level
  • 1896EGR Valve Controller - Out of Calibration
  • 1898VGT Actuator Controller - Out of Calibration
  • 1911Injector Metering Rail Number 1 Pressure - Data Valid But Above Normal Operating Range - Most Severe Level
  • 1911 (B)Injector Metering Rail 1 Pressure - Data Valid But Above Normal Operating Range - Most Severe Level
  • 1911 (CLX)Injector Metering Rail 1 Pressure Circuit - Data Valid But Above Normal Operating Range - Most Severe Level
  • 1911 (ISB)Injector Metering Rail 1 Pressure - Data Valid But Above Normal Operating Range - Most Severe Level
  • 1911 (ISC, ISL, ISX)Injector Metering Rail 1 Pressure Circuit - Data Valid But Above Normal Operating Range - Most Severe Level
  • 1921Aftertreatment Diesel Particulate Filter Differential Pressure - Data Valid But Above Normal Operating Range - Moderately Severe Level
  • 1921 (BCL)Aftertreatment Diesel Particulate Filter Differential Pressure - Data Valid But Above Normal Operating Range - Moderately Severe Level
  • 1921 (ISB, ISC, ISL)Aftertreatment Diesel Particulate Filter Differential Pressure - Data Valid But Above Normal Operating Range - Moderately Severe Level
  • 1921 (ISX)Aftertreatment Diesel Particulate Filter Differential Pressure - Data Valid But Above Normal Operating Range - Moderately Severe Level
  • 1921 (X)Aftertreatment Diesel Particulate Filter Differential Pressure - Data Valid But Above Normal Operating Range - Moderately Severe Level
  • 1922Aftertreatment Diesel Particulate Filter Differential Pressure - Data Valid But Above Normal Operating Range - Most Severe Level
  • 1922 (BCL)Aftertreatment Diesel Particulate Filter Differential Pressure - Data Valid But Above Normal Operating Range - Most Severe Level
  • 1922 (ISB, ISC, ISL)Aftertreatment Diesel Particulate Filter Differential Pressure - Data Valid But Above Normal Operating Range - Most Severe Level
  • 1922 (ISX)Aftertreatment Diesel Particulate Filter Differential Pressure - Data Valid But Above Normal Operating Range - Most Severe Level
  • 1922 (X)Aftertreatment Diesel Particulate Filter Differential Pressure - Data Valid But Above Normal Operating Range - Most Severe Level
  • 1923Aftertreatment Fuel Shutoff Valve 1 Circuit - Voltage Above Normal or Shorted to High Source
  • 1924Aftertreatment Fuel Shutoff Valve 1 Circuit - Voltage Below Normal or Shorted to Low Source
  • 1925Aftertreatment Fuel Shutoff Valve 1 - Data Erratic, Intermittent, or Incorrect
  • 1926Aftertreatment Fuel Pressure Sensor - Data Erratic, Intermittent, or Incorrect
  • 1927Aftertreatment Fuel Pressure Sensor Circuit - Voltage Above Normal or Shorted to High Source
  • 1928Aftertreatment Fuel Pressure Sensor Circuit - Voltage Below Normal or Shorted to Low Source
  • 1932Aftertreatment Doser - Data Erratic, Intermittent, or Incorrect
  • 1938ECU Power Output Supply Voltage 1 - Data Valid But Below Normal Operational Range - Moderately Severe Level
  • 1939ECU Power Output Supply Voltage 1 - Voltage Above Normal or Shorted to High Source. High battery voltage detected by the variable geometry turbocharger actuator.
  • 1942Crankcase Pressure - Data Erratic, Intermittent, or Incorrect
  • 1943Ambient Air Density - Data Valid But Below Normal Operational Range - Least Severe Level
  • 195Coolant Level Sensor 1 Circuit - Voltage Above Normal or Shorted to High Source
  • 195 (2-Wire Sensor)Coolant Level Sensor 1 Circuit - Voltage Above Normal or Shorted to High Source
  • 195 (3-Wire Sensor)Coolant Level Sensor 1 Circuit - Voltage Above Normal or Shorted to High Source
  • 196Coolant Level Sensor 1 Circuit - Voltage Below Normal or Shorted to Low Source
  • 1961EGR Valve Control Circuit Calculated Over Temperature - Data Valid But Above Normal Operational Range - Least Severe Level
  • 1962VGT Actuator Driver Over Temperature (Calculated) - Data Valid But Above Normal Operating Range - Least Severe Level
  • 196 (2-Wire Sensor)Coolant Level Sensor 1 Circuit - Voltage Below Normal or Shorted to Low Source
  • 1963Aftertreatment Fuel Shutoff Valve 1 - Mechanical System Not Responding Properly or Out of Adjustment
  • 196 (3-Wire Sensor)Coolant Level Sensor 1 Circuit - Voltage Below Normal or Shorted to Low Source
  • 196 (3-WIRE SESNOR)Coolant Level Sensor 1 Circuit - Voltage Below Normal or Shorted to Low Source
  • 1964Aftertreatment Doser - Mechanical System Not Responding or Out of Adjustment
  • 197Coolant Level - Data Valid but Below Normal Operational Range - Moderately Severe Level
  • 1974Crankcase Pressure - Data Valid But Above Normal Operating Range - Moderately Severe Level
  • 1976VGT Actuator Driver Temperature - Data Valid But Above Normal Operating Range - Least Severe Level
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