AftertreatmentMaxxForce Diesel ECM

SPN 3720

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

MaxxForce Aftertreatment

MaxxForce ECM Service

Diagnostic Overview

MaxxForce fault code SPN 3720 is commonly related to DPF ash load, regeneration status, or aftertreatment service requirement. The ECM may be indicating that the DPF has reached a monitored service limit or that aftertreatment performance is no longer within the expected range. This code should be diagnosed with DPF differential pressure, regen history, ash-load information, and any companion aftertreatment codes.

Likely Causes

Ash-loaded DPF, repeated incomplete regeneration, failed DPF differential pressure sensor, plugged pressure tubes, incorrect DPF reset history, or upstream engine condition causing high soot production.

What To Check First

Review DPF ash and soot data, inspect pressure tubes and sensors, confirm whether the DPF has been cleaned or replaced, and perform the appropriate reset only after the physical condition is verified.

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Related Aftertreatment Fault Codes

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SPN 1761

MaxxForce fault code SPN 1761 is commonly associated with the diesel exhaust fluid system, especially DEF level or DEF tank monitoring.

SPN 2637

MaxxForce fault code SPN 2637 generally belongs in the aftertreatment monitoring group and may relate to DPF regeneration, exhaust temperature control, or aftertreatment system performance depending on the engine and calibration.

SPN 3251

MaxxForce fault code SPN 3251 is commonly associated with diesel particulate filter differential pressure.

SPN 3361

MaxxForce fault code SPN 3361 is typically associated with DEF dosing or aftertreatment fluid delivery.

SPN 3362

MaxxForce fault code SPN 3362 usually points to DEF dosing system operation, DEF pressure, or DEF delivery control depending on the calibration.

SPN 3363

MaxxForce fault code SPN 3363 is commonly associated with DEF quality, DEF dosing performance, or SCR system response.

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