Cummins ISL & ISC Codes:
A complete list of all fault codes for Cummins engines with the HPCR fuel system.
Here are all the ISL and ISC codes available for the Cummins ECM. These Cummins trouble codes pertain to both models equipped with the High Pressure Common Rail (HPCR) fuel system.
ISL & ISC Codes 0-100
0001 Exhaust Gas Pressure Sensor Number 1 Circuit - Voltage Above Normal, or Shorted to High Source
0002 Exhaust Gas Pressure Sensor Number 1 Circuit - Voltage Below Normal, or Shorted to Low Source
0003 Exhaust Gas Pressure Sensor Number 1 Circuit - Data Erratic, Intermittent, or Incorrect
0004 Exhaust Gas Temperature Sensor Number 1 Circuit - Data Erratic, Intermittent, or Incorrect
0005 Exhaust Gas Temperature Sensor Number 1 Circuit - Voltage Below Normal, or Shorted to Low Source
0006 Exhaust Gas Temperature Sensor Number 1 Circuit - Voltage Above Normal, or Shorted to High Source
ISL & ISC Codes 100-200
111 Engine Control Module Critical Internal Failure - Bad Intelligent Device or Component
115 Engine Magnetic Crankshaft Speed/Position Lost Both of Two Signals - Data Erratic, Intermittent, or Incorrect
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
124 Intake Manifold One Pressure - Data Valid but Above Normal Operational Range - Moderately Severe Level
131 Accelerator Pedal or Lever 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 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 Oil Pressure Sensor Choice
135auto Oil Pressure Sensor Circuit — Voltage Above Normal or Shorted to High Source
135mar Oil Pressure Sensor Circuit — Voltage Above Normal or Shorted to High Source
141 Oil Pressure Sensor Circuit Choice
141auto Oil Pressure Sensor Circuit - Voltage Below Normal or Shorted to Low Source
141mar Oil Pressure Sensor Circuit - Voltage Below Normal or Shorted to Low Source
143 Oil Pressure Low Choice
143b Oil Pressure Low - Data Valid but Below Normal Operational Range - Moderately Severe Level
143bm Oil Pressure Low - Data Valid but Below Normal Operational Range - Moderately Severe Level
144 Coolant Temperature Sensor Circuit Choice
144b Engine Coolant Temperature 1 Sensor Circuit - Voltage Above Normal or Shorted to High Source
144bm Engine Coolant Temperature 1 Sensor Circuit - Voltage Above Normal or Shorted to High Source
145 Engine Coolant Temperature 1 Sensor Circuit Choice
145b Engine Coolant Temperature 1 Sensor Circuit - Voltage Below Normal or Shorted to Low Source
145bm Engine Coolant Temperature 1 Sensor Circuit - Voltage Below Normal or Shorted to Low Source
146 Engine Coolant Temperature Choice
146b Engine Coolant Temperature - Data Valid but Above Normal Operational Range - Moderately Severe Level
146bm Engine Coolant Temperature - Data Valid but Above Normal Operational Range - Moderately Severe Level
147 Accelerator Pedal or Lever Position 1 Sensor Circuit Frequency - Data Valid but Below Normal Operational Range - Most Severe Level
148 Accelerator Pedal or Lever Position Sensor One - Data Valid but Above Normal Operational Range - Most Severe level
151 Engine Coolant Temperature Choice
151b Engine Coolant Temperature - Data Valid but Above Normal Operational Range - Most Severe Level
151bm Engine Coolant Temperature - 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 1 Temperature Choice
155b Intake Manifold 1 Temperature - Data Valid but Above Normal Operational Range - Most Severe Level
155bm Engine Coolant Temperature 1 Sensor Circuit — Voltage Above Normal or Shorted to High Source
187 Sensor Supply Voltage Number 2 Circuit Choice
187b Sensor Supply Voltage Number 2 Circuit - Voltage Below Normal or Shorted to Low Source
187bm 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 Low - Data Valid but Below Normal Operational Range - Moderately Severe Level
ISL & ISC Codes 200-300
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 Voltage Number 2 Circuit Choice
227b Sensor Supply Voltage Number 2 Circuit - Voltage Above Normal or Shorted to High Source
227bm Sensor Supply 2 Circuit - Voltage Above Normal or Shorted to High Source
234 Engine Crankshaft Speed/Position Choice
234b Engine Crankshaft Speed/Position — Data Valid but Above Normal Operational Range - Most Severe Level
234bm Engine Crankshaft Speed/Position — Data Valid but Above Normal Operational Range - Most Severe Level
235 Coolant Level Low - Data Valid but Below Normal Operational Range - Most Severe Level
237 External Speed Command Input (Multiple Unit Synchronization - Data Erratic, Intermittent, or Incorrect
238 Sensor Supply 3 Circuit - Voltage Below Normal, or Shorted to Low Source
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
253 Engine Oil Level - Data Valid But Below Normal Operational Range - Most Severe Level
268 Injector Metering Rail 1 Pressure - Data Erratic, Intermittent, or Incorrect
269 Antitheft Password Valid Indicator - Data Erratic, Intermittent, or Incorrect
271 High Fuel Pressure Solenoid Valve Circuit Choice
271b High Fuel Pressure Solenoid Valve Circuit - Voltage Below Normal or Shorted to Low Source
271cl High Fuel Pressure Solenoid Valve Circuit - Voltage Below Normal or Shorted to Low Source
272 High Fuel Pressure Solenoid Valve Circuit Choice
272b High Fuel Pressure Solenoid Valve Circuit - Voltage Above Normal or Shorted to High Source
272cl High Fuel Pressure Solenoid Valve Circuit - Voltage Above Normal or Shorted to High Source
275 Fuel Pumping Element Number 1 (Front - Mechanical System Not Responding Properly or Out of Adjustment
281 Fault Pump Pressurizing Assembly 1 - Mechanical System Not Responding Properly or Out of Adjustment
284 Engine Speed/Position Sensor (Crankshaft Supply Voltage 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 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
291 Proprietary Datalink Error (OEM/Vehicle Datalink - Abnormal Update Rate
292 Auxiliary Temperature Sensor Input 1 - Special Instructions
293 Auxiliary Temperature Sensor Input 1 - Voltage Above Normal, or Shorted to High Source
294 Auxiliary Temperature Sensor Input 1 Circuit - Voltage Below Normal, or Shorted to Low Source
295 Barometric Pressure - Data Erratic, Intermittent, or Incorrect
296 Auxiliary Pressure Sensor Input 1 - Special Instructions
296a Auxiliary Pressure Sensor Input 1 - Special Instructions
296lrv Crankcase Pressure - Data Above Normal Operational Range - Severe Level
297 Auxiliary Pressure Sensor Input 1 Circuit - Voltage Above Normal, or Shorted to High Source
298 Auxiliary Pressure Sensor Input 1 Circuit - Voltage Below Normal, or Shorted to Low Source
ISL & ISC Codes 300-400
319 Real Time Clock Power Interrupt - Data Erratic, Intermittent, or Incorrect
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 Cylinder Number 2 Circuit - Current Below Normal or Open Circuit
332 Injector Solenoid Cylinder Number 4 Circuit - Current Below Normal or Open Circuit
334 Engine Coolant Temperature - Data Erratic, Intermittent, or Incorrect
341 Engine Control Module Data Lost - Data Erratic, Intermittent, or Incorrect
342 Electronic Calibration Code Incompatibility - Out of Calibration
343 Engine Control Module Warning Internal Hardware Failure - Bad Intelligent Device or Component
351 Injector Power Supply — 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
ISL & ISC Codes 400-500
412 SAE J1587/J1922 Data Link - Can Not Transmit
415 Engine Oil Rifle Pressure Choice
415sn Engine Oil Rifle Pressure - Data Valid but Below Normal Operational Range - Most Severe Level
415sw 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
426 SAE J1939 Data Link - Cannot Transmit
427 SAE J1939 Datalink - Abnormal Update Rate
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 Accelerator Pedal or Lever Idle Validation Circuit - Data Erratic, Intermittent, or Incorrect
431niss Accelerator Pedal or Lever Idle Validation Circuit - Data Erratic, Intermittent, or Incorrect
431sss Accelerator Pedal or Lever Idle Validation Circuit - Data Erratic, Intermittent, or Incorrect
432 Accelerator Pedal or Lever Idle Validation Circuit - Out of Calibration
433 Intake Manifold Pressure Sensor Circuit - Data Incorrect
434 Power Supply Lost With Ignition On - Data Erratic, Intermittent or Incorrect
435 Oil Pressure Switch Sensor Circuit - Data Erratic, Intermittent or Incorrect
436 Intake Manifold 1 Temperature - 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 Below Normal Operational Range - Moderately Severe Level
443 Accelerator Pedal or Lever Position Sensor Supply Voltage Circuit — Voltage Below Normal or Shorted to Low Source
449 Fuel Pressure High Choice
449b Injector Metering Rail Number 1 Pressure - Data Valid But Above Normal Operating Range - Most Severe Level
449cl Injector Metering Rail Number 1 Pressure - Data Valid But Above Normal Operating Range - Most Severe Level
451 Injector Metering Rail Number 1 Pressure Sensor Circuit - Voltage Above Normal or Shorted to High Source
452 Injector Metering Rail Number 1 Pressure Sensor Circuit - Voltage Below Normal or Shorted to Low Source
471 Engine Oil Level - Data Valid But Below Normal Operational Range - Least Severe Level
488 Intake Manifold 1 Temperature - Data Valid but Above Normal Operational Range - Moderately Severe Level
497 Multiple Unit Synchronization Switch - Data Erratic, Intermittent, or Incorrect
498 Engine Oil Level Sensor Circuit - Voltage Above Normal, or Shorted to High Source
499 Engine Oil Level Sensor Circuit - Voltage Below Normal, or Shorted to Low Source
ISL & ISC Codes 500-600
523 Auxiliary Intermediate (PTO Speed Switch Validation - Data Erratic, Intermittent, or Incorrect
527 Auxiliary Input/Out Two Circuit Voltage Above Normal or Shorted to High Source
528 Auxiliary Alternate Torque Validation Switch - Data Erratic, Intermittent, or Incorrect
529 Auxiliary Input/Output Three Circuit - Voltage Above Normal, or Shorted to High Source
545 Turbocharger 1 Wastegate Control - Mechanical System Not Responding Properly or Out of Adjustment
551 Idle Validation Switch Circuit Choice
551iss Accelerator Pedal or Lever Idle Validation Circuit - Voltage Below Normal or Shorted to Low Source
551niss Accelerator Pedal or Lever Idle Validation Circuit - Voltage Below Normal or Shorted to Low Source
551sss Accelerator Pedal or Lever Idle Validation Circuit - Voltage Below Normal or Shorted to Low Source
553 Injector Metering Rail One Pressure - Data Valid but Above Normal Operational Range - Moderately Severe Level
554 Injector Metering Rail 1 Pressure - Data Erratic, Intermittent, or Incorrect
559 Fuel Pump Delivery Pressure Low Choice
559b Fuel Pump Delivery Pressure Low - Data Valid but Below Normal Operational Range - Moderately Severe Level
559cl Injector Metering Rail 1 Pressure - Data Valid but Below Normal Operational Range - Moderately Severe Level
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 Choice
595b Turbocharger Number 1 Speed High - Warning Level
595cl 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
599 Auxiliary Commanded Dual Output Shutdown - Special Instructions
ISL & ISC Codes 600-700
649 Change Lubricating Oil and Filter - Condition Exists
687 Turbocharger Speed Sensor Choice
687b Turbocharger Speed Sensor - Below Normal Operating Range
687cl Turbocharger Number 1 Speed Low - Data Valid but Below Normal Operating Range - Moderately Severe Level
688 Engine Oil Level - Data Valid But Above Normal Operational Range - Most Severe Level
689 Engine Crankshaft Speed/Position - 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
ISL & ISC Codes 700-900
731 Engine Speed/Position Sensors Choice
731b Engine Speed Sensor/Position Camshaft and Crankshaft Misalignment - Mechanical System Not Responding Properly or Out of Adjustment
731bm Engine Speed Sensor/Position Camshaft and Crankshaft Misalignment - Mechanical System Not Responding Properly or Out of Adjustment
757 Electronic Control Module Data Lost - Condition Exists
778 Engine Speed Sensor (Camshaft Error - Data Erratic, Intermittent or Incorrect
779 Auxiliary Equipment Sensor Input Number 3 (OEM Switch - Root Cause Not Known
784 Adaptive Cruise Control - Error
ISL & ISC Codes 900-1200
951 Cylinder Power Imbalance Detected
957 EGR Valve Position - Data Erratic, Intermittent, or Incorrect
958 VGT Position Sensor - Data Erratic, Intermittent, or Incorrect
1117 Power Lost Without Ignition Off Choice
1117auto Power Lost Without Ignition Off - Data Erratic, Intermittent or Incorrect
1117mar Power Lost Without Ignition Off - Data Erratic, Intermittent or Incorrect
1139 Injector Solenoid Driver Cylinder 1 - Mechanical System Not Responding Properly or Out of Adjustment
1141 Injector Solenoid Driver Cylinder 2 - Mechanical System Not Responding Properly or Out of Adjustment
1142 Injector Solenoid Driver Cylinder 3 - Mechanical System Not Responding Properly or Out of Adjustment
1143 Injector Solenoid Driver Cylinder 4 - Mechanical System Not Responding Properly or Out of Adjustment
1144 Injector Solenoid Driver Cylinder 5 - Mechanical System Not Responding Properly or Out of Adjustment
1145 Injector Solenoid Driver Cylinder 6 - Mechanical System Not Responding Properly or Out of Adjustment
ISL & ISC Codes 1200-1600
1228 EGR Valve Position - Data Erratic, Intermittent, or Incorrect
1229 VGT Position Sensor - 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
ISL & ISC Codes 1600-1700
1633 Komnet Datalink Cannot Transmit - Data Erratic, Intermittent, or Incorrect
1639 Auxiliary Equipment Sensor Input Number 3 (OEM Switch - Root Cause Not Known
1654 Engine Misfire Cylinder 1 - Condition Exists
1655 Engine Misfire Cylinder 2 - Condition Exists
1656 Engine Misfire Cylinder 3 - Condition Exists
1657 Engine Misfire Cylinder 4 - Condition Exists
1658 Engine Misfire Cylinder 5 - Condition Exists
1659 Engine Misfire Cylinder 6 - Condition Exists
1663 Catalyst Inlet Temperature Sensor Swapped with Outlet - Condition Exists
1664 Catalyst Missing - Condition Exists
1665 Exhaust Gas Temperature 1 Circuit - Voltage Below Normal, or Shorted to Low Source
1666 Exhaust Gas Temperature Circuit 1 - Voltage Above Normal, or Shorted to Low Source
1667 Exhaust Gas Temperature 1 - Data Erratic, Intermittent, or Incorrect
1668 Catalyst Tank Level Sensor Circuit - Voltage Below Normal, or Shorted to Low Source
1669 Catalyst Tank Level Sensor Circuit - Voltage Above Normal, or Shorted to High Source
1671 Catalyst Tank Level - Data Valid but Below Normal Operational Range - Moderately Severe Level.
1673 Catalyst Tank Level - Data Erratic, Intermittent, or Incorrect
1674 Exhaust Gas Temperature 2 Circuit - Voltage Below Normal, or Shorted to Low Source
1675 Exhaust Gas Temperature 2 Circuit - Voltage Above Normal, or Shorted to Low Source
1676 Exhaust Gas Temperature 2 - Data Erratic, Intermittent, or Incorrect
1677 Catalyst Tank Temperature - Voltage Below Normal, or Shorted to Low Source
1678 Catalyst Tank Temperature - Voltage Above Normal, or Shorted to High Source
1679 Catalyst Tank Temperature - Data Erratic, Intermittent, or Incorrect
1681 Dosing Control Unit - Bad Intelligent Device or Component
1682 Catalyst Reagent Dosing Unit Input Lines - Condition Exists
1683 Catalyst Tank Heater Circuit - Voltage Above Normal, or Shorted to High Source
1684 Catalyst Tank Heater Circuit - Voltage Above Normal, or Shorted to High Source
1687 Catalyst Over Temperature - Data Valid but Above Normal Operational Range - Most Severe Level
1689 Real-Time Clock Power Interrupt - Data Erratic, Intermittent or Incorrect
1692 Aftertreatment Outlet NOx Sensor - Voltage Below Normal or Shorted to Low Source
1694 Aftertreatment Outlet NOx Sensor - Data Erratic, Intermittent, or Incorrect
1697 Aftertreatment #1 Air Enable Actuator - Voltage Above Normal, or Shorted to High Source
1698 Aftertreatment #1 Air Enable Actuator - Voltage Below Normal, or Shorted to Low Source
1699 Catalyst Tank Level Sensor - Data Erratic, Intermittent, or Incorrect
ISL & ISC Codes 1700-1800
1711 Dosing Control Unit Datalink - Abnormal Update Rate
1712 Catalyst Tank Heater Circuit - Data Valid But Below Normal Operating Range - Moderately Severe Level
1713 Catalyst Tank Heater Circuit - Data Valid But Above Normal Operating Range - Moderately Severe Level
1716 Auxiliary Temperature Sensor Input 1 Circuit - Root Cause Not Known
1717 Exhaust Gas Temperature 1 - Data Valid but Above Normal Operational Range - Least Severe Level
1718 Engine Misfire for Multiple Cylinders - Condition Exists
ISL & ISC Codes 1800-2000
1848 Intake Manifold 1 Temperature - Abnormal Rate of Change
1849 Exhaust Gas Temperature 1 - Abnormal Rate of Change
1851 Exhaust Gas Temperature 2 - Abnormal Rate of Change
1892 Wheel-Based Vehicle Speed - Data Valid but Below Normal Operational Range - Moderately Severe Level
1911 Injector Metering Rail 1 Pressure - Data Valid but Above Normal Operational Range - Most Severe Level
ISL & ISC Codes 2000-2200
2183 Engine Brake Actuator Driver 1 Circuit - Voltage Below Normal, or Shorted to Low Source
2185 Sensor Supply Voltage 4 Circuit - Voltage Above Normal or Shorted to High Source
2186 Sensor Supply Voltage 4 Circuit - Voltage Below Normal or Shorted to Low Source
ISL & ISC Codes 2200-2300
2215 Fuel Pump Delivery Pressure Low Choice
2215b Fuel Pump Delivery Pressure Low - Data Valid but Below Normal Operational Range - Moderately Severe Level
2215cl Fuel Pump Delivery Pressure Low - Data Valid but Below Normal Operational Range - Moderately Severe Level
2216 Fuel Pump Delivery Pressure High Choice
2216b Fuel Pump Delivery Pressure High - Data Valid but Above Normal Operational Range - Moderately Severe Level
2216cl Fuel Pump Delivery Pressure High - Data Valid but Above Normal Operational Range - Moderately Severe Level
2217 Engine Control Module Calibration Program Memory (RAM Corruption - Condition Exists
2249 Injector Metering Rail 1 Pressure - Data Valid but Below Normal Operational Range - Most Severe Level
2265 Electric Lift Pump for Engine Fuel Supply Circuit - Voltage Above Normal or Shorted to High Source
2266 Electric Lift Pump for Engine Fuel Supply Circuit - Voltage Below Normal or Shorted to Low Source
2271 EGR Valve Position Sensor Circuit - Voltage Above Normal or shorted to High Source
2272 EGR Valve Position Sensor Circuit - Voltage Below normal or Shorted to Low Source
2273 EGR Valve Differential Pressure Sensor Circuit - Shorted High
2274 EGR Valve Differential Pressure Sensor Circuit - Shorted Low
2292 Fuel Inlet Meter Device - Data Valid but Above Normal Operational Range - Moderately Severe Level
2293 Fuel Inlet Meter Device Flow Demand Lower Than Expected - Data Valid but Below Normal Operational Range - Moderately Severe Level
ISL & ISC Codes 2300-2500
2311 Fueling Actuator Number 1 Circuit Error Conditions Exists
2321 Engine Crankshaft Speed/Position - Data Erratic, Intermittent, or Incorrect
2322 Backup Engine Speed/Position Sensor Number 2 - Data Erratic, Intermittent, or Incorrect
2345 Turbocharger Speed Choice
2345b Turbocharger Speed - Invalid Rate of Change Detected
2345cl Turbocharger Speed Invalid Rate of Change detected - Abnormal Rate of Change
2346 Exhaust Gas Temperature Choice
2346b Exhaust Gas Temperature - Data Above Normal
2346cl Turbocharger Turbine Inlet Temperature (Calculated - Data Valid but Above Normal Operational Range - Least Severe Level
2347 Turbocharger Compressor Outlet Temperature Choice
2347b Turbocharger Compressor Outlet Temperature - Data Above Normal
2347cl Turbocharger Compressor Outlet Air Temperature (Calculated - Data Valid but Above Normal Range
2348 EGR Valve Failed Automatic Calibration Procedure
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
2359 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 Gas Pressure Sensor Circuit - Shorted High
2374 Exhaust Gas Pressure Sensor Circuit - Shorted Low
2375 Exhaust Gas Recirculation (EGR Temperature Sensor Circuit - Voltage Above Normal or Shorted to High Source
2376 Recirculation Exhaust Gas Temperature Sensor Circuit - Voltage Below Normal or Shorted to Low Source
2377 Fan Control Circuit - Voltage Above Normal or Shorted to High Source
2381 Turbocharger Position Sensor Circuit - Shorted High
2382 Turbocharger Position Sensor Circuit - Shorted Low
2383 Variable Geometry Turbocharger Actuator Circuit - Current Below Normal, or Open Circuit
2384 VGT Actuator Choice
2384b VGT Actuator - Voltage Below Normal or Shorted to Low Source
2384cl VGT Actuator Driver Circuit - Voltage Below Normal, or Shorted to Low Source
2385 VGT Actuator Choice
2385b VGT Actuator - Voltage Above Normal or Shorted to High Source
2385cl VGT Actuator Driver Circuit - Voltage Above Normal, or Shorted to High Source
2386 Turbocharger Actuator Motor Circuit - Current Above Normal
2387 Turbocharger Actuator Motor - Mechanical System Not Responding Properly
2388 Variable Geometry Turbocharger Actuator Position Failed Automatic Calibration Procedure - Out of Calibration
ISL & ISC Codes 2500-2800
2554 Exhaust Pressure Sensor Circuit - Data Erratic, Intermittent, or Incorrect
2555 Intake Air Heater Number 1 Circuit - Voltage Above Normal or Shorted to High Source
2556 Intake Air Heater Number 1 Circuit - Voltage Below Normal or Shorted to Low Source
2557 Auxiliary PWM Driver Number 1 - Voltage Above Normal or Shorted to High Source
2558 Auxiliary PWM Driver Number 1 - Voltage Below Normal or Shorted to Low Source
2659 Engine Coolant Temperature - Condition Exists
2771 Aftertreatment Outlet NOx Sensor - Abnormal Update Rate
2772 Aftertreatment Outlet NOx - Data Valid but Above Normal Operational Range - Least Severe Level
2773 Aftertreatment Outlet NOx - Data Valid but Above Normal Operational Range - Most Severe Level
ISL & ISC Codes 2800-3000
2961 EGR Temperature - Data Valid But Above Normal Operating Range, Least Severe Level
2962 EGR Temperature - Data Valid But Above Normal Operating 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
2976 Dosing Control Unit Temperature - Data Erratic, Intermittent, or Incorrect
ISL & ISC Codes 9000-9122
9121 EGR Valve Actuator Over Temperature (Calculated - Data Above Normal Range
9122 Variable Geometry Turbocharger Actuator Over Temperature
These are all the ISL and ISC codes available. For earlier ISL and ISC codes, and for other Cummins engine fault codes, use the links below.
These ISL & ISC codes are for quick reference to find out what your fault means. ISL & ISC codes can help pinpoint the problem and save hours of frustration.
For Cummins ISL & ISC codes on earlier models (2002 and before) use
ISC and ISL codes, CAPS fuel system.
Go to Cummins Codes by Engine Model
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