Cummins ISL & ISC Fault Codes:
A complete list of all fault codes for Cummins engines with CAPS fuel system.

Here are all the ISL and ISC fault codes available for the Cummins ECM. These Cummins trouble codes pertain to both models equipped with the CAPS fuel system.


ISC Fault Codes # 111-500
111 Electronic Control Module (ECM Microprocessor

115 Engine Speed Sensor (ESS Circuit

121 Engine Position Sensor Circuit

122 Intake Manifold Pressure Sensor Circuit

123 Intake Manifold Pressure Sensor Circuit

124 Intake Manifold Pressure - Engine Protection

131 Accelerator Position Sensor Circuit

132 Accelerator Position Sensor Circuit

133 Remote Throttle Position Sensor

134 Remote Throttle Position Sensor

135 Oil Pressure Sensor Circuit

141 Oil Pressure Sensor/Switch Circuit Choice

141sn Oil Pressure Sensor Circuit

141sw Oil Pressure Switch Circuit

143 Oil Pressure Sensor/Switch Circuit Choice

143sn Oil Pressure Sensor Circuit

143sw Oil Pressure Switch Circuit

144 Coolant Temperature Sensor Circuit

145 Coolant Temperature Sensor Circuit

146 Coolant Temperature - Engine Protection

147 Frequency Throttle Circuit

148 Frequency Throttle Circuit

151 Coolant Temperature - Engine Protection

153 Intake Manifold Air Temperature Sensor Circuit

154 Intake Manifold Air Temperature Sensor Circuit

184 OEM Pressure - Engine Protection

191 Air Conditioner Clutch Supply Circuit

221 Ambient Air Pressure Sensor Circuit

222 Ambient Air Pressure Sensor Circuit

234 Engine Overspeed Circuit

235 Engine Coolant Level - Engine Protection

241 Vehicle Speed Sensor Circuit

242 Vehicle Speed Sensor (VSS Circuit

243 Engine Brake Supply Choice

243isc Engine Brake Supply Circuit

243isl Engine Brake Supply Circuit

245 Engine Fan Clutch Supply Circuit

263 Fuel Temperature Sensor Circuit

265 Fuel Temperature Sensor Circuit

268 Fuel Pressure Sensor Circuit

271 Front Pumping Valve Circuit

272 Front Pumping Valve Circuit

273 Rear Pumping Valve Circuit

274 Rear Pumping Valve Circuit

275 Front Pumping Element

276 Injection Control Valve Stator Circuit

277 Injection Control Valve Stator Circuit

278 Lift Pump Circuit

279 Injection Control Valve Stator Circuit

281 Pumping Element

282 Pumping Element

283 Engine Speed Sensor

284 Engine Speed Sensor

285 J1939 Datalink Multiplexing

286 J1939 Datalink Multiplexing

296 OEM Pressure - Engine Protection

297 OEM Pressure Sensor Circuit

298 OEM Pressure Sensor Circuit

328 Rear Pumping Element

329 Fuel Injection Pump

349 Auxiliary Speed or Auxiliary Pressure Input Error

352 Sensor Supply Circuit

381 Intake Air Heater Relay Circuit

382 Intake Air Heater Relay Circuit

385 Remote Accelerator Control Circuit

387 Accelerator Position Sensor Circuit

415 Oil Pressure Sensor/Switch Circuit Choice

415sn Oil Pressure Sensor Circuit

415sw Oil Pressure Switch Circuit

418 Water-In-Fuel (WIF Sensor Circuit

422 Coolant Level Sensor Circuit

429 Water-In-Fuel (WIF Sensor Circuit

431 Idle Validation Switch (IVS Circuit

432 Accelerator Pedal Circuit (ISS

433 Intake Manifold Pressure Sensor Circuit

434 Unswitched Battery Supply Circuit

441 Unswitched Battery Supply Circuit

442 Unswitched Battery Supply Circuit

443 Accelerator Position Sensor Circuit

444 Remote Accelerator Control Circuit

449 Fuel Pressure Sensor Circuit

451 Fuel Pressure Sensor Circuit

452 Fuel Pressure Sensor Circuit

456 Fuel Pressure Sensor Circuit

488 Intake Manifold Air Temperature Sensor - Engine Protection Circuit

489 Auxiliary Speed or Auxiliary Pressure Input Error

493 Injection Control Valve Identifier Circuit

497 Primary/Secondary ECM Identification Error

ISC Fault Codes #515-2195

515 Coolant Level Sensor Circuit

516 Coolant Level Sensor Circuit

524 Switched Droop Selection Circuit

527 Dual Output Driver A

528 Alternate (Switched Torque Curve Switch Circuit

529 Dual Output Driver B

539 Transient Suppressor Circuit

768 Output Device Driver (Transmission Shift Modulator

779 OEM Input - Engine Protection

2194 Multiple Unit Synchronization Switch Error

2195 OEM Switch - Engine Protection


For Cummins trouble codes on later ISC and ISL models (2003 & up), use HPCR Fault Codes


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