AftertreatmentCaterpillar Diesel ECM

SPN 3701 FMI 15

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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Caterpillar Aftertreatment

Caterpillar ECM Service

Diagnostic Overview

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. The ECM is warning that the aftertreatment system is approaching a limit, but the condition may still be recoverable if addressed promptly. This code should not be treated as the root cause by itself; technicians should determine why the DPF or aftertreatment system reached the warning threshold.

Likely Causes

High soot loading; interrupted regenerations; excessive idle time; failed regen enable condition; faulty DPF differential pressure sensor; plugged sensor tubes; upstream engine fault creating soot.

What To Check First

Check soot load, active/inactive regen history, DPF differential pressure, exhaust temperature sensor data, and related ARD or engine performance codes.

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Related Aftertreatment Fault Codes

View All Aftertreatment Codes

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 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.

SPN 3719 FMI 0

CAT fault code 3719-0 is generally an aftertreatment soot-load or DPF restriction code at a high-severity level.

View All Aftertreatment Codes →