AftertreatmentCaterpillar Diesel ECM

SPN 3484 FMI 6

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 3484-6 usually indicates an aftertreatment or ARD control circuit with current above normal, commonly caused by a shorted component or shorted wiring. When this happens, the ECM may disable the output to protect the circuit, which can prevent normal regeneration. If left active, the DPF may load with soot and trigger additional aftertreatment or derate codes.

Likely Causes

Shorted ARD component; wiring short to ground; water intrusion; damaged connector; rubbed harness; failed control output; incorrect component.

What To Check First

Inspect wiring near hot exhaust areas, disconnect the controlled component for testing, check for shorts, and verify the circuit before replacing the ECM or aftertreatment parts.

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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.

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