AftertreatmentCaterpillar Diesel ECM

SPN 3715 FMI 31

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 3715-31 commonly relates to regeneration being needed, inhibited, or not completed under required conditions. It may appear when the ECM determines that soot load is high or that the aftertreatment system needs operator or service intervention. This code should be handled together with soot load, regeneration history, inhibit status, and any ARD or sensor faults that may have prevented successful regeneration.

Likely Causes

Regeneration needed; regen inhibited; repeated interrupted regens; high soot load; ARD fault; DPF pressure sensor issue; exhaust temperature sensor issue; excessive idle time.

What To Check First

Check soot load and regen status in Cat ET, verify regen is not inhibited, inspect related ARD and temperature codes, and perform the proper regen procedure only when allowed.

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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 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 →