Cummins ISL & ISC Fault Codes DTC
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 Incorrect0
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
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
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