All Brands Diesel Fault Codes
49 All Brands 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 (27)
- Guide Ash-Load — Diesel Particulate Filter
- Guide Ash-Soot — DPF Ash and Soot Load Models
- Guide AT-Injector — DEF / SCR Dosing Injector
- Guide DEF-Alt — SCR / DEF System
- Guide DEF-Freeze — DEF Supply Lines and Doser
- Guide DEF-Heater — DEF Tank and Line Heaters
- Guide DEF-Limp — DEF Inducement 5 MPH Limp Mode
- Guide DEF-SCR — DEF Quality and SCR Catalyst Health
- Guide DEF-Test — Diesel Exhaust Fluid Quality
- Guide Delta-P — DPF Differential Pressure Sensor
- Guide DPF-DOC — DPF Inlet Face / Diesel Oxidation Catalyst
- Guide DPF-Regen — Diesel Particulate Filter Regeneration
- Guide Fleet-History — Fleet Fault Code History and Trend Tracking
- Guide Fuel-Contam — Aftertreatment System
- Guide NOx-MM — NOx Sensor
- Guide NOx-Sensors — SCR NOx Sensors
- Guide Regen-Safe — DPF Manual / Parked Regeneration
- Guide Regen-Type — DPF Regeneration System
- Guide Roadside-AT — Roadside Aftertreatment Triage
- Guide SCR-Derate — SCR Inducement Derate
- Guide SCR-PIDs — SCR Aftertreatment System
- Guide Tow-vs-Limp — SCR Inducement and Derate Decision Guide
- Guide Warranty-Emissions — Emissions System Warranty Coverage
- SPN 3710 FMI 0 — Diesel Oxidation Catalyst
- SPN 3712 FMI 2 — DPF Regeneration Inhibit Switch
- SPN 3719 FMI 16 — DPF Soot Load
- SPN 5571 FMI 7 — SCR DEF Dosing Valve
Fuel (6)
Air/Turbo (5)
Sensors/Other (11)
- Guide Code-Clear — ECM Fault Code Management
- Guide Code-Order — ECM Diagnostic Strategy
- Guide Code-Status — ECM Fault Code Memory
- Guide Code-Types — Diesel Fault Code Types
- Guide FMI-3 FMI 3 — Failure Mode Identifier 3
- Guide FMI-18 FMI 18 — Failure Mode Identifier 18
- Guide Freeze-Frame — ECM Snapshot / Freeze Frame Data
- Guide J1939-Reading — J1939 Diagnostic Protocol
- Guide JPRO-Workflow — Noregon JPRO Fleet Diagnostic Workflow
- Guide MIL-Type — Malfunction Indicator Lamp (MIL)
- SPN 1267 FMI 3 — Glow Plug Control Circuit