Mack Diesel Fault Codes
41 Mack 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 (18)
- Guide MP8-Derate — Mack MP8 Aftertreatment Derate System
- SPN 3216 FMI 0 — SCR Intake NOx Sensor
- SPN 3226 FMI 0 — Outlet NOx Sensor
- SPN 3242 FMI 3 — DPF Intake Gas Temperature Sensor
- SPN 3246 FMI 16 — DPF Outlet Gas Temperature
- SPN 3363 FMI 3 — DEF Tank Heater
- SPN 3363 FMI 16 — DEF Pump Pressure
- SPN 3364 FMI 9 — DEF Quality
- SPN 3480 FMI 16 — HC Doser Fuel Supply Pressure
- SPN 3719 FMI 0 — DPF Ash Load
- SPN 3719 FMI 16 — DPF Ash Load
- SPN 4094 FMI 16 — DPF Soot Load
- SPN 4360 FMI 3 — Aftertreatment #1 SCR Catalyst Intake Gas Temperature Sensor
- SPN 4363 FMI 1 — SCR Outlet Gas Temperature Sensor
- SPN 4363 FMI 3 — SCR Outlet Gas Temperature Sensor
- SPN 4364 FMI 18 — SCR NOx Efficiency
- SPN 5246 FMI 0 — SCR Operator Inducement
- SPN 5394 FMI 3 — DEF Tank Heater Circuit
Fuel (4)
Air/Turbo (5)
Coolant (3)
Sensors/Other (11)
- SPN 91 FMI 9 — Accelerator Pedal Position
- SPN 98 FMI 17 — Engine Oil Level Sensor
- SPN 100 FMI 18 — Engine Oil Pressure Sensor / Oil Pressure Circuit
- SPN 168 FMI 1 — Battery / Charging System Circuit
- SPN 175 FMI 16 — Engine Oil Temperature 1
- SPN 190 FMI 0 — Engine Speed Sensor Circuit
- SPN 190 FMI 8 — Engine Speed Sensor (Crankshaft)
- SPN 636 FMI 2 — Crankshaft Position Sensor
- SPN 646 FMI 5 — Turbocharger 1 Wastegate Drive
- SPN 1569 FMI 31 — Engine Protection Torque Derate
- SPN 3509 FMI 4 — Sensor Supply Voltage 1