ISB fault codes:
A complete list of all ISM codes for Cummins diesel engines with EGR Systems

Having trouble finding what your ISM codes mean? Here is a list of all Cummins fault codes for the ISM engine.

Keep in mind these ISM codes apply only to the CM875 Cummins ECM, engine built after October of 2002 with the EGR system.

Just scroll down the list for a discription of your specific code.

111 Engine Control Module Critical Internal Failure - Bad Intelligent Device or Component
122 Intake Manifold Pressure Sensor Circuit - Voltage Above Normal or Shorted to High Source
123 Intake Manifold Pressure Sensor Circuit - Voltage Below Normal or Shorted to Low Source
131 Accelerator Pedal Position Sensor Circuit - Shorted High
132 Accelerator Pedal or Lever Position Sensor Circuit - Voltage Below Normal or Shorted to Low Source
133 Remote Accelerator Pedal or Lever Position Sensor Circuit - Voltage Above Normal, or Shorted to High Source
134 Remote Accelerator Pedal or Lever Position Sensor Circuit - Voltage Below Normal, or Shorted to Low Source
135 Oil Pressure Sensor Circuit - Voltage Above Normal or Shorted to High Source
141 Oil Pressure Sensor Circuit - Voltage Below Normal or Shorted to Low Source
143 Oil Pressure Low - Data Valid but Below Normal Operational Range - Moderately Severe Level
144 Coolant Temperature Sensor Circuit - Voltage Above Normal or Shorted to High Source
145 Coolant Temperature Sensor Circuit - Voltage Below Normal or Shorted to Low Source
151 Coolant Temperature High - Data Valid but Above Normal Operational Range - Most Severe Level
153 Intake Manifold Air Temperature Sensor Circuit - Voltage Above Normal or Shorted to High Source
154 Intake Manifold Air Temperature Sensor Circuit - Voltage Below Normal or Shorted to Low Source
155 Intake Manifold Air Temperature High - Data Valid but Above Normal Operational Range - Most Severe Level
187 Sensor Supply Voltage Number 2 Circuit - Voltage Below Normal or Shorted to Low Source
195 Coolant Level Sensor Circuit - Choice
195-2wire Coolant Level Sensor Circuit — Voltage Above Normal or Shorted to High Source
195-3wire Coolant Level Sensor Circuit — Voltage Above Normal or Shorted to High Source
196 Coolant Level Sensor Circuit - Choice
196-2wire Coolant Level Sensor Circuit — Voltage Below Normal or Shorted to Low Source
196-3wire Coolant Level Sensor Circuit — Voltage Below Normal or Shorted to Low Source
197 Coolant Level Low - Data Valid but Below Normal Operational Range - Moderately Severe Level
ISM Codes 200 - 300
212 Oil Temperature Sensor Circuit - Voltage Above Normal, or Shorted to High Source
213 Oil Temperature Sensor Circuit - Voltage Below Normal, or Shorted to Low Source
214 Oil Temperature High - Data Valid but Above Normal Operational Range - Most Severe Level
219 Oil Level Number 2 (Remote Low - Data Valid but Below Normal Operational Range - Least 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
223 Oil Burn Valve Solenoid Circuit - Voltage Below Normal, or Shorted to Low Source
224 Oil Burn Valve Solenoid Circuit - Voltage Above Normal, or Shorted to High Source
227 Sensor Supply Voltage Number 2 Circuit - Voltage Above Normal or Shorted to High Source
234 Engine Speed High - Data Valid but Above Normal Operational Range - Most Severe Level
235 Coolant Level Low - Data Valid but Below Normal Operational Range - Most Severe Level
241 Vehicle Speed Sensor Circuit - Data Erratic, Intermittent, or Incorrect
242 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 Circuit - Voltage Above Normal, or Shorted to High Source
254 Fuel Shutoff Valve Circuit - Voltage Below Normal, or Shorted to Low Source
255 Fuel Shutoff Valve Circuit - Voltage Above Normal, or Shorted to High Source
256 Ambient Air Temperature Sensor Circuit - Voltage Below Normal, or Shorted to Low Source
259 Engine Fuel Shutoff Valve Stuck Open - Mechanical System not Responding Properly or Out of Adjustment
285 SAE J1939 Multiplexing PGN Timeout Error - Abnormal Update Rate
286 SAE J1939 Multiplexing Configuration Error - Out of Calibration
287 SAE J1939 Multiplexing Accelerator Pedal or Lever Sensor System Error - Received Network Data Error
288 SAE J1939 Multiplexing Remote Accelerator Pedal or Lever Data Error - Received Network Data Error
295 Barometric Air Pressure Sensor Circuit - Data Erratic, Intermittent, or Incorrect
ISM Codes 300 - 400
311 Injector Solenoid Cylinder Number 1 Circuit - Current Above Normal, or Grounded Circuit
312 Injector Solenoid Cylinder Number 5 Circuit - Current Above Normal, or Grounded Circuit
313 Injector Solenoid Cylinder Number 3 Circuit - Current Above Normal, or Grounded Circuit
314 Injector Solenoid Cylinder Number 6 Circuit - Current Above Normal, or Grounded Circuit
315 Injector Solenoid Cylinder Number 2 Circuit - Current Above Normal, or Grounded Circuit
321 Injector Solenoid Cylinder Number 4 Circuit - Current Above Normal, or Grounded Circuit
322 Injector Solenoid Cylinder Number 1 Circuit - Current Below Normal or Open Circuit
323 Injector Solenoid Cylinder Number 5 Circuit - Current Below Normal or Open Circuit
324 Injector Solenoid Cylinder Number 3 Circuit - Current Below Normal or Open Circuit
325 Injector Solenoid Cylinder Number 6 Circuit - Current Below Normal or Open Circuit
331 Injector Solenoid Cylinder Number 2 Circuit - Current Below Normal or Open Circuit
332 Injector Solenoid Cylinder Number 4 Circuit - Current Below Normal or Open Circuit
338 Idle Shutdown Vehicle Accessories Relay Circuit - Voltage Above Normal, or Shorted to High Source
339 Idle Shutdown Vehicle Accessories Relay Circuit - Voltage Below Normal, or Shorted to Low Source
341 Engine Control Module Data Lost - Data Erratic, Intermittent, or Incorrect
343 Engine Control Module Warning Internal Hardware Failure - Bad Intelligent Device or Component
352 Sensor Supply Voltage Number 1 Circuit - Voltage Below Normal or Shorted to Low Source
386 Sensor Supply Voltage Number 1 Circuit - Voltage Above Normal or Shorted to High Source
387 Accelerator Pedal or Lever Position Sensor Supply Voltage Circuit - Voltage Above Normal or Shorted to High Source
ISM Codes 400 - 500
415 Oil Pressure Low - Data Valid but Below Normal Operational Range - Most Severe Level
418 Water-In-Fuel Indicator High - Data Valid but Above Normal Operational Range - Least Severe Level
428 Water-In-Fuel Sensor Circuit - Voltage Above Normal or Shorted to High Source
429 Water-In-Fuel Sensor Circuit - Voltage Below Normal or Shorted to Low Source
431 Idle Validation Switch Circuit Choice
431iss Idle Validation Switch Circuit - Integrated Switch and Sensor Type
431niss Idle Validation Switch Circuit - Non-Integrated Switch and Sensor Type
431sss Idle Validation Switch Circuit - Solid-State Switch and Sensor Type
432 Accelerator Pedal or Lever Idle Validation Circuit - Out of Calibration
433 Intake Manifold Pressure Sensor Circuit - Data Erratic, Intermittent, or Incorrect
434 Power Lost without Ignition Off - Data Erratic, Intermittent, or Incorrect
435 Oil Pressure Sensor Circuit - Data Erratic, Intermittent, or Incorrect
443 Accelerator Pedal or Lever Position Sensor Supply Voltage Circuit - Voltage Below Normal or Shorted to Low Source
ISM Codes 500 - 600
551 Idle Validation Switch Circuit Choice
551iss Idle Validation Switch Circuit - Integrated Switch and Sensor Type
551niss Idle Validation Switch Circuit - Non-Integrated Switch and Sensor Type
551sss Idle Validation Switch Circuit - Solid-State Switch and Sensor Type
584 Starter Relay Circuit - Voltage Above Normal or Shorted to High Source
585 Starter Relay Circuit - Voltage Below Normal or Shorted to Low Source
595 Turbocharger Number 1 Speed High - Data Valid but Above Normal Operational Range - Moderately Severe Level
596 Electrical Charging System Voltage High - Data Valid but Above Normal Operational Range - Moderately Severe Level
597 Electrical Charging System Voltage Low - Data Valid but Below Normal Operational Range - Moderately Severe Level
598 Electrical Charging System Voltage Low - Data Valid but Below Normal Operational Range - Most Severe Level
ISM Codes 600- 1000
649 Change Lubricating Oil and Filter - Condition Exists
687 Turbocharger Number 1 Speed Low - Data Valid but Below Normal Operational Range - Moderately Severe Level
689 Primary Engine Speed Sensor Error - Data Erratic, Intermittent, or Incorrect
691 Turbocharger Number 1 Compressor Inlet Temperature Sensor Circuit - Voltage Above Normal or Shorted to High Source
692 Turbocharger Number 1 Compressor Inlet Temperature Sensor Circuit - Voltage Below Normal or Shorted to Low Source
778 Engine Speed Sensor (Camshaft Error - Data Erratic, Intermittent or Incorrect
784 Loss of Communication with Adaptive Cruise Control - Data Erratic, Intermittent or Incorrect
951 Cylinder Power Imbalance Between Cylinders - Data Erratic, Intermittent, or Incorrect
ISM Codes 1000 - 9121
1119 Engine Coolant Temperature - Data Valid but Above Normal Operational Range - Moderately Severe Level
1137 Hall Effect Speed Sensors Connected Incorrectly - Condition Exists
1228 EGR Valve Position Sensor Circuit - Data Erratic, Intermittent, or Incorrect
1943 Ambient Air Density - Data Valid But Below Normal Operational Range - Least Severe Level
2197 (OEM Temperature Sensor Engine Protection Warning - Root Cause Not Known
2271 EGR Valve Position Circuit - Voltage Above Normal, or Shorted to High Source
2272 EGR Valve Position Circuit - Voltage Below Normal, or Shorted to Low Source
2273 EGR Valve Delta Pressure Sensor Circuit - Voltage Above Normal, or Shorted to High Source
2274 EGR Valve Delta Pressure Sensor Circuit - Voltage Below Normal, or Shorted to Low Source
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
2348 EGR Valve Position Failed Automatic Calibration Procedure - Out of Calibration
2349 EGR Valve Control Circuit - Current Below Normal, or Open Circuit
2351 EGR Valve Control Circuit - Voltage Below Normal, or Shorted to Low Source
2352 EGR Valve Control Circuit - Voltage Above Normal, or Shorted to High Source
2353 EGR Valve Control Circuit - Current Above Normal, or Grounded Circuit
2357 EGR Valve Control - Mechanical System Not Responding Properly, or Out of Adjustment
(105-fc2359 EGR Differential Pressure Sensor - Data Valid but Above Normal Operating Range - Moderately Severe Level
2362 Engine Brake Actuator Circuit Number 1 - Voltage Below Normal or Shorted to Low Source
2363 Engine Brake Actuator Circuit Number 2 - Voltage Below Normal or Shorted to Low Source
2366 Engine Brake Actuator Circuit Number 1 - Voltage Above Normal or Shorted to High Source
2367 Engine Brake Actuator Circuit Number 2 - Voltage Above Normal or Shorted to High Source
2373 Exhaust Pressure Sensor Circuit - Voltage Above Normal, or Shorted to High Source
2374 Exhaust Pressure Sensor Circuit - Voltage Below Normal, or Shorted to Low Source
2375 EGR Gas Temperature Sensor Circuit - Voltage Above Normal, or Shorted to High Source
2376 EGR Gas Temperature Sensor Circuit - Voltage Below Normal, or Shorted to Low Source
2377 Fan Control Circuit - Voltage Above Normal or Shorted to High Source
2384 VGT Actuator - Voltage Below Normal or Shorted to Low Source
2385 VGT Actuator - Voltage Above Normal or Shorted to High Source
2554 Exhaust Pressure Sensor Circuit - Data Erratic, Intermittent or Incorrect
2961 EGR Temperature - Data Valid but Above Normal Operational Range - Least Severe Level
2962 EGR Temperature - Data Valid but Above Normal Operational Range - Moderately Severe Level
2963 Engine Coolant Temperature High - Data Valid but Above Normal Operational Range - Least Severe Level
2964 Intake Manifold Temperature High - Data Valid but Above Normal Operational Range - Least Severe Level
2973 Intake Manifold Pressure Sensor Circuit - Data Erratic, Intermittent or Incorrect
9121 EGR Valve Actuator Over Temperature (Calculated - Data Valid but Above Normal Operational Range - Least Severe Level

Although this list of ISM codes can look overwhelming, with the correct tools and helpful information Cummins fault codes are very user friendly. Always make sure your ISM codes are inactive and cleared after repairs are completed.

These are all the ISM codes available. You can find more specific fault codes for Cummins engines (including ISM codes for engine built before 2002) by clicking the following link.

Cummins Fault Codes

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