AftertreatmentCaterpillar Diesel ECM

SPN 3701 FMI 16

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 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. In practical use, this often means the DPF or aftertreatment system requires immediate diagnosis before the machine progresses into stronger derate or shutdown protection. The code may be caused by a true DPF restriction or by inaccurate sensor information, so the pressure sensor system must be verified before condemning the filter.

Likely Causes

DPF soot or ash loading; failed or incomplete regen; DPF pressure sensor fault; plugged pressure tubes; exhaust restriction; bad temperature sensor; excessive soot from EGR, turbo, injector, or air system problem.

What To Check First

Confirm soot and ash estimates, compare DPF differential pressure to expected values, inspect sensor tubes, and determine whether a service regen or DPF cleaning is required.

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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 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 3719 FMI 0

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

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