AftertreatmentCaterpillar Diesel ECM

SPN 3719 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.

Call Now Request a Quote Create Service Ticket

System

Caterpillar Aftertreatment

Caterpillar ECM Service

Diagnostic Overview

CAT fault code 3719-16 generally indicates an aftertreatment soot-load or DPF restriction condition above normal at a moderate severity level. It is more serious than an early warning and can progress to stronger derate if ignored. The root cause may be a physically loaded DPF, failed regeneration, inaccurate differential pressure reading, or an engine problem creating excessive soot. The diagnostic path should verify sensor accuracy before deciding whether the filter needs cleaning.

Likely Causes

High DPF soot load; failed regeneration; ash-loaded DPF; plugged pressure tubes; faulty DPF pressure sensor; exhaust leak; EGR/turbo/injector issue causing soot.

What To Check First

Review soot and ash load, inspect DPF pressure tubes, compare live pressure data, check regen history, and inspect upstream systems that can overproduce soot.

⏵ Truck down? Fleet stalled?

Caterpillar Code SPN 3719 FMI 16? Get An Honest Diagnosis.

Send us your fault codes and operational context. Same-day quote, remote diagnostic available, ship-in service nationwide.

Create Service Ticket

Internal Linking

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 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 →