CUMMINS ISX Engine Fault Codes DTC
Cummins ISX Engine Fault Codes 111-500
111 Electronic Control Module Critical Internal Failure - Bad Intelligent Device or Component
115 Engine Magnetic Speed / Position Lost Both of Two Signals - Data Erratic, Intermittent, or Incorrect
122 Intake Manifold 1 Pressure Sensor Circuit - Voltage Above Normal, or Shorted to High Source
123 Intake Manifold 1 Pressure Sensor Circuit - Voltage Below Normal, or Shorted to Low Source
125 Intake Manifold 1 Pressure - Data Valid but Below Normal Operational Range - Moderately Severe Level
131 Accelerator Pedal or Lever Position Sensor 1 Circuit - Voltage Above Normal, or Shorted to High Source
132 Accelerator Pedal or Lever Position Sensor 1 Circuit - Voltage Below Normal or Shorted to Low Source
133 Remote Accelerator Pedal or Lever Position Sensor 1 Circuit - Voltage Above Normal, or Shorted to High Source
134 Remote Accelerator Pedal or Lever Position Sensor 1 Circuit - Voltage Below Normal, or Shorted to Low Source
135 Engine Oil Rifle Pressure 1 Sensor Circuit - Voltage Above Normal, or Shorted to High Source
141 Engine Oil Rifle Pressure 1 Sensor Circuit - Voltage Below Normal, or Shorted to Low Source
143 Engine Oil Rifle Pressure - Data Valid but Below Normal Operational Range - Moderately Severe Level
144 Engine Coolant Temperature 1 Sensor Circuit - Voltage Above Normal, or Shorted to High Source
145 Engine Coolant Temperature 1 Sensor Circuit - Voltage Below Normal, or Shorted to Low Source
146 Engine Coolant Temperature - Data Valid but Above Normal Operational Range - Moderately Severe Level
151 Engine Coolant Temperature - Data Valid but Above Normal Operational Range - Most Severe Level
153 Intake Manifold 1 Temperature Sensor Circuit - Voltage Above Normal, or Shorted to High Source
154 Intake Manifold 1 Temperature Sensor Circuit - Voltage Below Normal, or Shorted to Low Source
155 Intake Manifold 1 Temperature - Data Valid but Above Normal Operational Range - Most Severe Level
187 Sensor Supply 2 Circuit Choice
187ism Sensor Supply 2 Circuit - Voltage Below Normal, or Shorted to Low Source
187isx Sensor Supply 2 Circuit - Voltage Below Normal, or Shorted to Low Source
195 Coolant Level Sensor 1 Circuit Choice
195-2wire Coolant Level Sensor 1 Circuit - Voltage Above Normal, or Shorted to High Source
195-3wire Coolant Level Sensor 1 Circuit - Voltage Above Normal, or Shorted to High Source
196 Coolant Level Sensor 1 Circuit Choice
196-2wire Coolant Level Sensor 1 Circuit - Voltage Below Normal, or Shorted to Low Source
196-3wire Coolant Level Sensor 1 Circuit - Voltage Below Normal, or Shorted to Low Source
197 Coolant Level - Data Valid but Below Normal Operational Range - Moderately Severe Level
212 Engine Oil Temperature Sensor 1 Circuit - Voltage Above Normal, or Shorted to High Source
213 Engine Oil Temperature Sensor 1 Circuit — Voltage Below Normal, or Shorted to Low Source
214 Engine Oil Temperature High - Data Valid but Above Normal Operational Range - Most Severe Level
221 Barometric Pressure Sensor Circuit - Voltage Above Normal, or Shorted to High Source
222 Barometric Pressure Sensor Circuit - Voltage Below Normal, or Shorted to Low Source
227 Sensor Supply 2 Circuit - Voltage Above Normal, or Shorted to High Source
234 Engine Crankshaft Speed/Position - Data Valid but Above Normal Operational Range - Most Severe Level
238 Sensor Supply 3 Circuit - Voltage Below Normal, or Shorted to Low Source
241 Wheel-Based Vehicle Speed - Data Erratic, Intermittent or Incorrect
242 Wheel-Based Vehicle Speed Sensor Circuit Tampering Has Been Detected - Abnormal Rate of Change
245 Fan Control Circuit - Voltage Below Normal or Shorted to Low Source
249 Ambient Air Temperature Sensor 1 Circuit - Voltage Above Normal, or Shorted to High Source
254 Engine Fuel Shutoff Valve Driver Circuit - Voltage Below Normal, or Shorted to Low Source
255 Engine Fuel Shutoff Valve Driver Circuit - Voltage Above Normal, or Shorted to High Source
256 Ambient Air Temperature Sensor 1 Circuit - Voltage Below Normal, or Shorted to Low Source
257 Engine Fuel shutoff Valve Driver - Mechanical System Not Responding Properly or Out of Adjustment
263 Engine Fuel Temperature Sensor 1 Circuit - Voltage Above Normal, or Shorted to High Source
265 Engine Fuel Temperature Sensor 1 Circuit - Voltage Below Normal, or Shorted to Low Source
285 SAE J1939 Multiplexing PGN Timeout Error - Abnormal Update Rate
286 SAE J1939 Multiplexing Configuration Error - Out of Calibration
287 SAE J1939 Multiplexed Accelerator Pedal or Lever Sensor System - Received Network Data In Error
288 SAE J1939 Multiplexing Remote Accelerator Pedal or Lever Position Sensor System - Received Network Data In Error
295 Barometric Pressure - Data Erratic, Intermittent, or Incorrect
311 Injector Solenoid Driver Cylinder 1 Circuit - Current Above Normal, or Grounded Circuit
312 Injector Solenoid Driver Cylinder 5 Circuit - Current Above Normal, or Grounded Circuit
313 Injector Solenoid Driver Cylinder 3 Circuit - Current Above Normal, or Grounded Circuit
314 Injector Solenoid Driver Cylinder 6 Circuit - Current Above Normal, or Grounded Circuit
315 Injector Solenoid Driver Cylinder 2 Circuit - Current Above Normal, or Grounded Circuit
319 Real Time Clock Power Interrupt - Data Erratic, Intermittent, or Incorrect
321 Injector Solenoid Driver Cylinder 4 Circuit - Current Above Normal, or Grounded Circuit
322 Injector Solenoid Driver Cylinder 1 Circuit - Current Below Normal, or Open Circuit
323 Injector Solenoid Driver Cylinder 5 Circuit - Current Below Normal, or Open Circuit
324 Injector Solenoid Driver Cylinder 3 Circuit - Current Below Normal, or Open Circuit
325 Injector Solenoid Driver Cylinder 6 Circuit - Current Below Normal, or Open Circuit
331 Injector Solenoid Driver Cylinder 2 Circuit - Current Below Normal, or Open Circuit
332 Injector Solenoid Driver Cylinder 4 Circuit - Current Below Normal, or Open Circuit
338 Idle Shutdown Vehicle Accessories Relay Driver Circuit - Voltage Above Normal, or Shorted to High Source
339 Idle Shutdown Vehicle Accessories Relay Driver Circuit - Voltage Below Normal, or Shorted to Low Source
343 Engine Control Module Warning Internal Hardware Failure - Bad Intelligent Device or Component
346 Engine Control Module Calibration Memory Software - Bad Intelligent Device or Component
351 Injector Power Supply - Bad Intelligent Device or Component
352 Sensor Supply 1 Circuit - Voltage Below Normal, or Shorted to Low Source
386 Sensor Supply 1 Circuit - Voltage Above Normal, or Shorted to High Source
415 Engine Oil Rifle Pressure - Data Valid but Below Normal Operational Range - Most Severe Level
418 Water in Fuel Indicator - Data Valid but Above Normal Operational Range - Least Severe Level
427 SAE J1939 Datalink - Abnormal Update Rate
428 Water-in-Fuel Indicator Sensor Circuit - Voltage Above Normal, or Shorted to High Source
429 Water-in-Fuel Indicator Sensor Circuit - Voltage Below Normal, or Shorted to Low Source
435 Engine Oil Rifle Pressure - Data Erratic, Intermittent, or Incorrect
441 Battery 1 Voltage - Data Valid but Below Normal Operational Range - Moderately Severe Level
442 Battery 1 Voltage - Data Valid but Above Normal Operational Range - Moderately Severe Level
Cummins ISX Codes 500-1000
546 Fuel Delivery Pressure Sensor Circuit - Voltage Above Normal, or Shorted to High Source
547 Fuel Delivery Pressure Sensor Circuit - Voltage Below Normal, or Shorted to Low Source
555 Crankcase Pressure - Data Valid but Above Normal Operational Range - Moderately Severe Level
556 Crankcase Pressure — Data Valid but Above Normal Operational Range — Most Severe Level
584 Starter Relay Driver Circuit - Voltage Above Normal, or Shorted to High Source
585 Starter Relay Driver Circuit - Voltage Below Normal, or Shorted to Low Source
596 Electrical Charging System Voltage - Data Valid but Above Normal Operational Range - Moderately Severe Level
597 Electrical Charging System Voltage - Data Valid but Below Normal Operational Range - Moderately Severe Level
598 Electrical Charging System Voltage - Data Valid but Below Normal Operational Range - Most Severe Level
649 Engine Oil Change Interval - Condition Exists
686 Turbocharger 1 Speed - Data Erratic, Intermittent, or Incorrect
687 Turbocharger 1 Speed - Data Valid but Below Normal Operational Range - Moderately Severe Level
689 Engine Crankshaft Speed/Position - Data Erratic, Intermittent, or Incorrect
689ism Engine Crankshaft Speed/Position - Data Erratic, Intermittent, or Incorrect
689isx Engine Crankshaft Speed/Position - Data Erratic, Intermittent, or Incorrect
691 Turbocharger 1 Compressor Inlet Temperature Sensor Circuit - Voltage Above Normal, or Shorted to High Source
692 Turbocharger 1 Compressor Inlet Temperature Sensor Circuit - Voltage Below Normal, or Shorted to Low Source
697 ECM Internal Temperature Sensor Circuit - Voltage Above Normal, or Shorted to High Source
698 ECM Internal Temperature Sensor Circuit - Voltage Below Normal, or Shorted to Low Source
731 Engine Speed / Position Camshaft and Crankshaft Misalignment - Mechanical System Not Responding Properly or Out of Adjustment
778 Engine Camshaft Speed/Position Sensor Choice
778ism Engine Camshaft Speed/Position Sensor - Data Erratic, Intermittent, or Incorrect
778isx Engine Camshaft Speed/Position Sensor - Data Erratic, Intermittent, or Incorrect
784 Adaptive Cruise Control Mode - Data Erratic, Intermittent, or Incorrect
Cummins ISX Codes 1000-1300
1117 Power Supply Lost With Ignition On - Data Erratic, Intermittent, or Incorrect
1239 Accelerator Pedal or Lever Position Sensor 2 Circuit - Voltage Above Normal, or Shorted to High Source
1241 Accelerator Pedal or Lever Position Sensor 2 Circuit - Voltage Below Normal, or Shorted to Low Source
1242 Accelerator Pedal or Lever Position Sensor 1 and 2 - Data Erratic, Intermittent, or Incorrect
Cummins ISX Codes 1300-1700
1663 Catalyst Inlet Temperature Sensor Swapped with Outlet - Condition Exists
1664 Catalyst Missing - Condition Exists
1665 Aftertreatment Exhaust Gas Temperature 1 Circuit - Voltage Below Normal, or Shorted to Low Source
1666 Aftertreatment Exhaust Gas Temperature 1 Circuit - Voltage Above Normal, or Shorted to High Source
1667 Aftertreatment Exhaust Gas Temperature 1 - Data Erratic, Intermittent, or Incorrect
1674 Aftertreatment Exhaust Gas Temperature 2 Circuit - Voltage Below Normal, or Shorted to Low Source
1675 Aftertreatment Exhaust Gas Temperature 2 Circuit - Voltage Above Normal, or Shorted to High Source
1676 Aftertreatment Exhaust Gas Temperature 2 - Data Erratic, Intermittent, or Incorrect
1691 Catalyst Efficiency - Out of Calibration
1695 Sensor Supply 5 - Voltage Above Normal, or Shorted to High Source
1696 Sensor Supply 5 - Voltage Below Normal, or Shorted to Low Source
Cummins ISX Codes 1700-1900
1843 Crankcase Pressure Circuit - Voltage Above Normal, or Shorted to High Source
1844 Crankcase Pressure Circuit - Voltage Below Normal, or Shorted to Low Source
1866 Exhaust Gas Recirculation Valve Delta Pressure - Data Erratic, Intermittent, or Incorrect
1876 Aftertreatment Exhaust Gas Temperature 3 Circuit - Voltage Above Normal, or Shorted to High Source
1877 Aftertreatment Exhaust Gas Temperature 3 Circuit - Voltage Below Normal, or Shorted to Low Source
1878 Aftertreatment Exhaust Gas Temperature 3 - Data Erratic, Intermittent, or Incorrect
1879 Aftertreatment Particulate Filter Differential Pressure Sensor Circuit - Voltage Above Normal, or Shorted to High Source
1881 Aftertreatment Particulate Filter Differential Pressure Sensor Circuit - Voltage Below Normal, or Shorted to Low Source
1883 Aftertreatment Particulate Filter Differential Pressure Sensor - Data Erratic, Intermittent, or Incorrect
1893 EGR Valve Control Circuit - Abnormal Update Rate
1895 EGR Valve Controller - Bad Intelligent Device or Component
1896 EGR Valve Controller - Out of Calibration
1899 Exhaust Gas Recirculation Valve Delta Pressure - Data Valid but Above Normal Operational Range- Moderately Severe Level
Cummins ISX Codes 1900-2000
1921 Aftertreatment Particulate Filter Differential Pressure - Data Valid but Above Normal Operational Range - Moderately Severe Level
1922 Aftertreatment Particulate Filter Differential Pressure - Data Valid but Above Normal Operational Range - Most Severe Level
1923 Aftertreatment Fuel shutoff Valve 1 Circuit - Voltage Above Normal, or Shorted to High Source
1924 Aftertreatment Fuel Shutoff Valve 1 Circuit - Voltage Below Normal, or Shorted to Low Source
1925 Aftertreatment Fuel Shutoff Valve 1 - Data Erratic, Intermittent, or Incorrect
1926 Aftertreatment Fuel Pressure Sensor - Data Erratic, Intermittent, or Incorrect
1927 Aftertreatment Fuel Pressure Sensor - Voltage Above Normal, or Shorted to High Source
1928 Aftertreatment Fuel Pressure Sensor - Voltage Below Normal, or Shorted to Low Source
1932 Aftertreatment Fuel Injector 1 - Data Erratic, Intermittent, or Incorrect
1933 ECU Power Output Supply Voltage 2 - Data Valid but Above Normal Operational Range - Moderately Severe Level
1934 ECU Power Output Supply Voltage 2 - Data Valid but Below Normal Operational Range - Moderately Severe Level
1935 EGR Actuator Driver Circuit - Root Cause Not Known
1938 ECU Power Output Supply Voltage 1 - Data Valid but Below Normal Operational Range - Moderately Severe Level
1942 Crankcase Pressure - Data Erratic, Intermittent, or Incorrect
1943 Ambient Air Density - Data Valid but Below Normal Operational Range - Least Severe Level
1961 EGR Valve Control Circuit Calculated Over Temperature - Data Valid but Above Normal Operational Range - Least Severe Level
1962 VGT Actuator Driver Over Temperature (Calculated - Data Valid but Above Normal Operational Range - Least Severe Level
1963 Aftertreatment Fuel Shutoff Valve 1 - Mechanical System Not Responding Properly or Out of Adjustment
1966 Aftertreatment Exhaust Gas Temperature 1 - Data Valid but Above Normal Operational Range - Most Severe Level
1968 Aftertreatment Exhaust Gas Temperature 2 - Data Valid but Above Normal Operational Range - Moderately Severe Level
1969 Aftertreatment Exhaust Gas Temperature 2 - Data Valid but Above Normal Operational Range - Most Severe Level
1972 Aftertreatment Exhaust Gas Temperature 3 - Data Valid but Above Normal Operational Range - Moderately Severe Level
1973 Aftertreatment Exhaust Gas Temperature 3 - Data Valid but Above Normal Operational Range - Most Severe Level
1974 Crankcase Pressure - Data Valid but Above Normal Operational Range - Least Severe Level
1977 Aftertreatment Fuel Injector 1 Circuit - Current Below Normal, or Open Circuit
1981 Aftertreatment Particulate Filter Differential Pressure - Data Valid but Above Normal Operational Range - Least Severe Level
1993 Aftertreatment Particulate Filter Missing - Condition Exists
Cummins ISX Codes 2000-2200
2182 Engine Brake Actuator Driver 1 Circuit - Voltage Above Normal, or Shorted to High Source
2183 Engine Brake Actuator Driver 1 Circuit - Voltage Below Normal, or Shorted to Low Source
2185 Sensor Supply 4 Circuit — Voltage Above Normal, or Shorted to High Source
2186 Sensor Supply 4 Circuit - Voltage Below Normal, or Shorted to Low Source
2195 Auxiliary Equipment Sensor Input 3 Engine Protection Critical - Special Instructions
2198 VGT Actuator Driver Circuit - Root Cause Not Known
Cummins ISX Codes 2200-2400
2215 Fuel Pump Delivery Pressure — Data Valid but Below Normal Operational Range — Moderately Severe Level
2216 Fuel Pump Delivery Pressure - Data Valid but Above Normal Operational Range - Moderately Severe Level
2272 EGR Valve Position Circuit - Voltage Below Normal, or Shorted to Low Source
2273 Exhaust Gas Recirculation Valve Delta Pressure Sensor Circuit - Voltage Above Normal, or Shorted to High Source
2274 Exhaust Gas Recirculation Valve Delta Pressure Sensor Circuit - Voltage Below Normal, or Shorted to Low Source
2288 Turbocharger 1 Speed - Data Valid but Above Normal Operational Range - Least Severe Level
2311 Electronic Fuel Injection Control Valve Circuit — Condition Exists
2312 Timing Actuator Driver Circuit - Condition Exists
2313 Fuel Control Valve Solenoid Driver 2 Circuit - Condition Exists
2314 Engine Timing Actuator Driver 2 Circuit Error - Condition Exists
2321 Engine Crankshaft Speed/Position — Data Erratic, Intermittent, or Incorrect
2322 Engine Camshaft Speed/Position Sensor — Data Erratic, Intermittent, or Incorrect
2345 Turbocharger 1 Speed - Abnormal Rate of Change
2346 Turbocharger Turbine Inlet Temperature (Calculated - Data Valid but Above Normal Operational Range - Least Severe Level)
2347 Turbocharger Compressor Outlet Temperature (Calculated - Data Valid but Above Normal Operational Range - Least Severe Level)
2349 EGR Valve Control Circuit - Current Below Normal, or Open Circuit
2351 EGR Valve Control Circuit - Voltage Below Normal, or Shorted to Low Source
2357 EGR Valve Control Circuit - Mechanical System Not Responding Properly or Out of Adjustment
2359 Exhaust Gas Recirculation Valve Delta Pressure - Data Valid but Above Normal Operational Range - Moderately Severe Level
2363 Engine Brake Actuator Driver Output 2 Circuit Choice
2363ism Engine Brake Actuator Driver Output 2 Circuit - Voltage Below Normal, or Shorted to Low Source
2363isx Engine Brake Actuator Driver Output 2 Circuit - Voltage Below Normal, or Shorted to Low Source
2365 Engine Brake Actuator Driver Output 3 Circuit - Voltage Below Normal, or Shorted to Low Source
2367 Engine Brake Actuator Driver Output 2 Circuit Choice
2367ism Engine Brake Actuator Driver Output 2 Circuit - Voltage Above Normal, or Shorted to High Source
2367isx Engine Brake Actuator Driver Output 2 Circuit - Voltage Above Normal, or Shorted to High Source
2368 Engine Brake Actuator Driver Output 3 Circuit - Voltage Above Normal, or Shorted to High Source
2372 Fuel Filter Differential Pressure - Data Valid but Above Normal Operational Range - Moderately Severe Level
2373 Exhaust Gas Pressure Sensor Circuit - Voltage Above Normal, or Shorted to High Source
2374 Exhaust Gas Pressure Sensor Circuit - Voltage Below Normal, or Shorted to Low Source
2375 Exhaust Gas Recirculation Temperature Sensor Circuit - Voltage Above Normal, or Shorted to High Source
2376 Exhaust Gas Recirculation Temperature Sensor Circuit - Voltage Below Normal, or Shorted to Low Source
2377 Fan Control Circuit — Voltage Above Normal, or Shorted to High Source
2387 VGT Actuator Driver Circuit (Motor - Mechanical System Not Responding Properly, or Out of Adjustment
Cummins ISX Codes 2400-2600
2412 Fan Speed - Data Erratic, Intermittent, or Incorrect
2448 Coolant Level - Data Valid but Below Normal Operational Range - Least Severe Level
2449 VGT Actuator Controller - Out of Calibration
2451 Turbocharger Turbine Inlet Temperature (Calculated - Data Valid but Above Normal Operational Range - Moderately Severe Level
2551 Injector Metering Rail 2 Pressure - Data Valid but Above Normal Operational Range - Moderately Severe Level
2552 Injector Metering Rail 1 Pressure - Data Valid but Above Normal Operational Range - Moderately Severe Level
2554 Exhaust Gas Pressure - Data Erratic, Intermittent, or Incorrect
Cummins ISX Codes 2600-2800
2634 VGT Actuator Controller - Bad Intelligent Device or Component
2635 VGT Actuator Driver Circuit - Condition Exists
2636 VGT Actuator Driver Circuit - Abnormal Update Rate
2637 Catalyst Face Plugged - Root Cause Not Known
2638 Catalyst Efficiency - Out of Calibration
2639 Aftertreatment Particulate Filter Differential Pressure - Data Valid but Above Normal Operational Range - Least Severe Level
2646 Engine Coolant Temperature - Condition Exists
2659 Engine Coolant Temperature - Condition Exists
2728 Aftertreatment Fuel Injector 1 - Data Valid but Above Normal Operational Range - Moderately Severe Level
2732 Aftertreatment Fuel Drain Valve Circuit - Voltage Above Normal or Shorted to High Source
2733 Aftertreatment Fuel Drain Valve Circuit - Voltage Below Normal or Shorted to Low Source
2738 Start Enable Device 1 Circuit (Ether Injection - Voltage Above Normal or Shorted to High Source
2739 Start Enable Device 1 Circuit (Ether Injection - Voltage Below Normal or Shorted to Low Source
2741 Aftertreatment Fuel Shutoff Valve 1 Swapped - Condition Exists
2742 Aftertreatment Exhaust Gas Temperature 2 - Data Valid but Below Normal Operational Range - Least Severe Level
2743 Aftertreatment Exhaust Gas Temperature 2 - Data Valid but Below Normal Operational Range - Moderately Severe Level
2754 Engine Particulate Filter Inlet Pressure - Data Valid but Above Normal Operational Range - Moderately Severe Level
2764 Exhaust Gas Pressure - Data Valid but Above Normal Operational Range - Moderately Severe Level
2774 Engine Exhaust Gas Recirculation (EGR System - Condition Exists
2777 Particulate Trap Active Regeneration Inhibited Due to Inhibit Switch - Condition Exists
2789 Engine Coolant Temperature - Data Valid but Below Normal Operational Range - Moderately Severe Level
Cummins ISX Codes 2800-3000
2813 EGR Valve Control - Special Instructions
2878 Aftertreatment Fuel Drain Valve - Mechanical System Not Responding Properly or Out of Adjustment
2879 Aftertreatment Fuel Drain Valve - Data Erratic, Intermittent, or Incorrect
2881 Aftertreatment Fuel Pressure Sensor - Data Valid but Below Normal Operational Range - Least Severe Level
2961 Exhaust Gas Recirculation Temperature - Data Valid but Above Normal Operational Range - Least Severe Level
2962 Exhaust Gas Recirculation Temperature - Data Valid but Above Normal Operational Range - Moderately Severe Level
2963 Engine Coolant Temperature — Data Valid but Above Normal Operational Range — Least Severe Level
2964 Intake Manifold 1 Temperature — Data Valid but Above Normal Operational Range — Least Severe Level
2973 Intake Manifold 1 Pressure - Data Erratic, Intermittent, or Incorrect