AftertreatmentCaterpillar Diesel ECM

SPN 3480 FMI 18

Name: ECM Performance
Address: Fort Lauderdale, FL, 33325, US
Telephone: (888) 768-2447
Price range: $$-$$$

DPF, DEF, SCR, and NOx-reduction system faults.

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System

Caterpillar Aftertreatment

Caterpillar ECM Service

Diagnostic Overview

CAT fault code 3480-18 generally indicates an aftertreatment or ARD fuel-pressure condition below normal at a moderate severity level. The ARD may still operate, but it may not generate sufficient heat for a complete regeneration. Repeated failed regenerations can eventually lead to DPF restriction and derate. The technician should confirm whether the pressure issue is real by testing fuel delivery and comparing live pressure readings.

Likely Causes

Marginal ARD fuel pressure; restricted supply; weak pump; contaminated fuel; plugged filter; faulty pressure sensor; fuel aeration; wiring or connector problem.

What To Check First

Check ARD fuel pressure during a service test, inspect filters and lines, verify fuel quality, and compare pressure readings to specification.

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Related Aftertreatment Fault Codes

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SPN 1761 FMI 17

CAT fault code 1761-17 commonly relates to diesel exhaust fluid level or a DEF level signal that is below the expected range.

SPN 3360 / SPN 3820

CAT codes listed as 3360/3820 generally point toward the DEF supply, DEF quality, DEF tank, or SCR dosing system depending on the exact FMI shown in Cat ET.

SPN 3361 / SPN 3821

CAT codes listed as 3361/3821 commonly belong to the DEF dosing or SCR control side of the aftertreatment system.

SPN 3474 FMI 31

CAT fault code 3474-31 is typically associated with aftertreatment regeneration or ARD-related operation.

SPN 3701 FMI 15

CAT fault code 3701-15 commonly indicates an aftertreatment condition that is above normal but at a least-severe level, often connected with DPF soot load, regeneration need, or aftertreatment restriction.

SPN 3701 FMI 16

CAT fault code 3701-16 usually represents a more serious aftertreatment condition than 3701-15, with the measured or calculated value above normal at a moderate severity level.

View All Aftertreatment Codes →