Cummins ISX Codes: 

Here are all the Cummins ISX codes available for the Cummins ECM.
These Cummins trouble codes pertain to ISX engines built with the EGR system, but pre-DPF (2002 - 2006).

Cummins ISX 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


For Cummins ISX codes on earlier models (before 2002), use: Cummins ISX Codes (before 2002).



Go to All Cummins Fault Codes 
Leave Cummins ISX Codes and return to Home Page