Cummins Diesel Fault Codes
60 Cummins diagnostic pages, grouped by the system the code belongs to. Each page covers symptoms, the tests to run in order, tools needed, and realistic parts and labor cost ranges.
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Aftertreatment (23)
- Guide INSITE-AT — Cummins INSITE Aftertreatment Diagnostics
- Guide X15-TSB — Cummins X15 Aftertreatment System
- SPN 1761 FMI 1 — DEF Tank Level Sensor
- SPN 2659 FMI 18 — DEF Dosing Unit
- SPN 3216 FMI 0 — SCR Intake NOx Sensor
- SPN 3226 FMI 0 — SCR Outlet NOx Sensor
- SPN 3251 FMI 0 — DPF Differential Pressure
- SPN 3251 FMI 16 — DPF Differential Pressure
- SPN 3361 FMI 9 — DEF Tank Level
- SPN 3362 FMI 9 — DEF Tank Temperature
- SPN 3364 FMI 9 — DEF Dosing Unit
- SPN 3480 FMI 1 — HC Doser Fuel Supply Pressure
- SPN 3719 FMI 0 — DPF Ash Load
- SPN 3719 FMI 16 — DPF Ash Load
- SPN 4334 FMI 31 — SCR Catalyst Reagent Quality/Efficiency
- SPN 4364 FMI 1 — SCR NOx Efficiency
- SPN 4364 FMI 18 — SCR NOx Conversion Efficiency
- SPN 4766 FMI 10 — DOC Outlet Gas Temperature
- SPN 4766 FMI 16 — DOC Outlet Gas Temperature
- SPN 5246 FMI 0 — SCR Inducement
- SPN 5246 FMI 15 — SCR Inducement
- SPN 5246 FMI 16 — SCR Inducement
- SPN 520372 FMI 16 — DEF Dosing System
Fuel (10)
- SPN 94 FMI 3 — Fuel Delivery Pressure Sensor Circuit
- SPN 157 FMI 2 — Fuel Rail Pressure
- SPN 157 FMI 16 — Engine Fuel Rail Pressure
- SPN 164 FMI 1 — Injector Metering Rail 1 Pressure
- SPN 651 FMI 5 — Injector Solenoid Driver Circuit - Cylinder #1
- SPN 653 FMI 5 — Fuel Injector Cylinder 3
- SPN 654 FMI 5 — Injector Cylinder 4
- SPN 1381 FMI 4 — Fuel Supply Pump Inlet Pressure Sensor
- SPN 1381 FMI 18 — Fuel Supply Pump Inlet Pressure Sensor
- SPN 1382 FMI 16 — Fuel Filter Differential Pressure
Air/Turbo (4)
Coolant (3)
Sensors/Other (20)
- SPN 27 FMI 7 — EGR Valve
- SPN 84 FMI 2 — Wheel-Based Vehicle Speed Sensor
- SPN 91 FMI 3 — Accelerator Pedal Position
- SPN 98 FMI 1 — Engine Oil Level Sensor / Oil Level Circuit
- SPN 100 FMI 1 — Engine Oil Pressure Sensor / Oil Pressure Circuit
- SPN 100 FMI 17 — Engine Oil Pressure
- SPN 100 FMI 18 — Engine Oil Pressure Sensor
- SPN 168 FMI 2 — Battery / ECU Power Supply Circuit
- SPN 172 FMI 3 — Engine Air Inlet Temperature Sensor
- SPN 190 FMI 0 — Engine Speed Sensor Circuit
- SPN 190 FMI 2 — Engine Speed Sensor
- SPN 512 FMI 2 — Driver's Demand Engine Percent Torque
- SPN 629 FMI 12 — Electronic Control Module (ECM)
- SPN 636 FMI 2 — Crankshaft Position Sensor
- SPN 723 FMI 2 — Transmission Output Speed
- SPN 1209 FMI 0 — Exhaust Gas Pressure Sensor (Exhaust Backpressure)
- SPN 1569 FMI 31 — Engine Protection Shutdown
- SPN 3031 FMI 10 — EGR Valve
- SPN 3363 FMI 9 — EGR System
- SPN 3509 FMI 4 — 5-Volt Sensor Supply Voltage 1