Cummins ISX Fault Codes:
A complete list of all fault codes for the Cummins ISX engine (before 2002).

Here are all the Cummins ISX fault codes available for the Cummins ECM. These Cummins trouble codes pertain to ISX engines built without the EGR system (before 2002).




ISX Fault Code List
111 Electronic Control Module (ECM Microprocessor

115 Camshaft Engine Position Sensor Circuit

121 Crankshaft Engine Position Sensor Circuit

122 Intake Manifold Pressure Sensor Circuit

123 Intake Manifold Pressure Sensor Circuit

131 Accelerator Position Sensor Circuit

132 Accelerator Position Sensor Circuit

133 Remote Throttle Position Sensor Circuit

134 Remote Throttle Position Sensor Circuit

135 Oil Pressure Sensor Circuit

141 Oil Pressure Sensor Circuit

143 Oil Pressure Sensor Circuit

144 Coolant Temperature Sensor Circuit

145 Coolant Temperature Sensor Circuit

147 Frequency Throttle Circuit

148 Frequency Throttle Circuit

153 Intake Manifold Temperature Sensor Circuit

154 Intake Manifold Temperature Sensor Circuit

187 Sensor Voltage Supply

198 ICON™ Lamp Circuit

199 ICON™ Lamp Circuit

212 Oil Temperature Sensor Circuit

213 Oil Temperature Sensor Circuit

216 Wet Tank Pressure Sensor Circuit

217 Wet Tank Pressure Sensor Circuit

218 Wet Tank Pressure Sensor Circuit

221 Ambient Air Pressure Sensor Circuit

222 Ambient Air Pressure Sensor Circuit

223 Burn Valve Solenoid

227 Sensor Voltage Supply

234 Engine Overspeed

235 Engine Coolant Level - Engine Protection

241 Vehicle Speed Sensor Circuit

242 Vehicle Speed Sensor Circuit

245 Engine Fan Clutch Supply Circuit

249 Ambient Air Temperature Sensor Circuit

254 Fuel Shutoff Valve Solenoid Supply Circuit

255 Fuel Shutoff Valve Solenoid Supply Circuit

256 Ambient Air Temperature Sensor Circuit

259 Fuel Shutoff Valve

284 Sensor Supply Voltage

285 J1939 Datalink Multiplexing

286 J1939 Datalink Multiplexing

293 OEM Temperature Sensor Circuit

294 OEM Temperature Sensor Circuit

295 Ambient Air Pressure Sensor

297 OEM Pressure Sensor Circuit

298 OEM Pressure Sensor Circuit

319 Real-Time Clock Power Circuit

338 Idle Shutdown Vehicle Accessory/Ignition Bus Relay Circuit

339 Idle Shutdown Vehicle Accessory/Ignition Bus Relay Circuit

341 Unswitched Battery Supply Circuit

343 Electronic Control Module (ECM

349 Auxiliary Speed Governor

352 Sensor Voltage Supply

359 ICON™ Idle Control System

378 Actuator Circuit

379 Actuator Circuit

386 Sensor Voltage Supply

387 Throttle Voltage Supply

388 Engine Brake Supply Circuit

392 Engine Brake Supply Circuit

393 Engine Brake Supply Circuit

394 Actuator Circuit

395 Actuator Circuit

396 Actuator Circuit

397 Actuator Circuit

398 Actuator Circuit

399 Actuator Circuit

415 Actuator Circuit

419 Intake Manifold Pressure Sensor

422 Coolant Level Sensor Circuit

426 J1939 Datalink Communication

428 Water-In-Fuel (WIF Sensor Circuit

429 Water-In-Fuel (WIF Sensor Circuit

431 Idle Validation Switch Choice

431iss Idle Validation Switch Circuit

431niss Idle Validation Switch Circuit

431sss Idle Validation Switch Circuit

432 Accelerator Pedal Circuit

433 Intake Manifold Pressure Circuit

434 Unswitched Battery Supply Circuit

435 Oil Pressure Sensor

441 Unswitched Battery Supply Circuit

442 Unswitched Battery Supply Circuit

443 Throttle Voltage Supply

449 High Fuel Pressure

451 Front Rail Pressure Sensor Circuit

452 Front Rail Pressure Sensor Circuit

465 Wastegate Actuator Number 1 Circuit

466 Wastegate Actuator Number 1 Circuit

469 ICON™ Cab Thermostat Circuit

472 Crankcase Oil Level Sensor Circuit

474 Starter Solenoid Lockout Relay Driver Circuit

475 Electronic Air Compressor Governor Circuit

476 Electronic Air Compressor Governor Circuit

482 Low Fuel Pressure

483 Rear Rail Pressure Sensor Circuit

484 Rear Rail Pressure Sensor Circuit

485 Rear Rail Pressure Sensor Circuit

486 Fuel System Underfueling

489 Auxiliary Speed Input Error

491 Wastegate Actuator Number 2 Circuit

492 Wastegate Actuator Number 2 Circuit

496 Sensor Supply Voltage

527 Switched Output A Error

528 Switched Output B Error

529 Switched Output B Error

536 Autoshift Low Gear Actuator (Lockout Solenoid Circuit

537 Autoshift High Gear Actuator (Shift Solenoid Circuit

538 Autoshift Neutral Actuator

541 ICON™ Starter Relay/Interlock Circuit

544 Top 2 Transmission Circuit - Mechanical System Failure

546 Fuel Pressure Sensor Circuit

547 Fuel Pressure Sensor Circuit

551 Idle Validation Switch Choice

551iss Idle Validation Switch Circuit

551ivs Idle Validation Switch Circuit

551sss Idle Validation Switch Circuit

553 Fuel System Overfueling

559 Fuel System Underfueling

581 Fuel Inlet Restriction Sensor Circuit

582 Fuel Inlet Restriction Sensor Circuit

583 Fuel Inlet Restriction Sensor Circuit

588 Engine Start Alarm Circuit

589 Engine Start Alarm Circuit

595 Turbocharger Speed High (Calculated

596 Voltage Monitor - High Voltage

597 Voltage Monitor - Low Voltage

598 Voltage Monitor - Very Low Voltage

731 Engine Speed Sensor and Camshaft Position Sensor - Mechanical Misalignment Between Camshaft and Crankshaft Sensors

753 Engine Speed Sensor Circuit

755 Fuel Injector

758 Fuel Injector

784 Adaptive Cruise Control Circuit

951 Cylinder Power Imbalance


For Cummins ISX fault codes on later models (2003 & up), use ISX Fault Codes (2003 & Later)


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