Caterpillar Diesel Fault Codes
34 Caterpillar 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 (11)
- Guide C15-Regen — Caterpillar C15 ACERT DPF Regeneration
- SPN 1761 FMI 17 — DEF Tank Level Sensor
- SPN 3246 FMI 3 — Aftertreatment #1 DPF Outlet Gas Temperature Sensor
- SPN 3246 FMI 16 — DPF Outlet Gas Temperature Sensor
- SPN 3363 FMI 1 — DEF Pump Pressure Sensor
- SPN 3364 FMI 9 — DEF Quality Sensor
- SPN 4094 FMI 1 — DPF Soot Load Percent
- SPN 4094 FMI 16 — DPF Soot Load
- SPN 4358 FMI 1 — SCR Catalyst Exhaust Differential Pressure
- SPN 4358 FMI 2 — SCR Differential Pressure Sensor
- SPN 4766 FMI 16 — DOC Outlet Gas Temperature Sensor
Fuel (5)
Air/Turbo (3)
Coolant (2)
Sensors/Other (13)
- SPN 27 FMI 3 — EGR Valve Position Sensor Circuit
- SPN 92 FMI 16 — Engine Percent Load
- SPN 100 FMI 1 — Engine Oil Pressure Sensor
- SPN 101 FMI 3 — Engine Crankcase Pressure Sensor / Blow-By Circuit
- SPN 101 FMI 16 — Engine Crankcase Pressure
- SPN 168 FMI 1 — Battery / ECU Power Supply Voltage
- SPN 176 FMI 4 — Turbocharger Oil Temperature Sensor
- SPN 190 FMI 0 — Engine Speed Sensor Circuit
- SPN 190 FMI 2 — Crankshaft Position Sensor
- SPN 190 FMI 8 — Engine Speed (Crankshaft Position)
- SPN 637 FMI 2 — Camshaft/Timing Reference Sensor
- SPN 646 FMI 3 — Wastegate Drive
- SPN 723 FMI 9 — Camshaft Position Sensor