This 14-page Fault Code 3582 DTCs troubleshooting guide provides the complete diagnostic procedure for resolving low SCR catalyst conversion efficiency on CM2250-controlled engines. It covers fault code identification, conditions for setting and clearing the code, associated service procedures, and a structured troubleshooting tree that walks technicians from initial fault verification through DEF system inspection, exhaust leak checks, and final ECM calibration validation.
Official Fault Code 3582 DTCs document details
| Brand | Cummins |
| Model coverage | ISB6.7 CM2250, ISC8.3 CM2250, ISL9 CM2250, ISX11.9 CM2250, ISX15 CM2250 |
| System/Group | Aftertreatment SCR Catalyst Conversion Efficiency — DTC 3582 (SPN 4364 / FMI 18) |
| Publication no. | Bulletins 4022250, 4022254, 4022257, 2883445 |
| Year/Revision | Last Modified 12-Jul-2010 |
| Pages | 14 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview — Circuit Description and Component Location
- Fault Code 3582 Summary — Code Reason, Effect, Lamp Status (Amber CHECK ENGINE / MIL)
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Code
- Action Taken When the Fault Code is Active — Torque Derate
- Conditions for Clearing the Fault Code — Reset All Faults via INSITE™
- Shop Talk — Possible Causes
- Associated Procedures Table (011-036, 011-056, 011-058, 011-060, 011-062, 011-063, 019-032)
- Step 1 — Check Active Fault Codes (3582, 1694, 3228, 3748, 3749, DEF dosing codes)
- Step 2 — Inspect DEF System: External Leaks, DEF Quality (Refractometer 4919554), Dosing Unit Override Test
- Step 3 — Check Aftertreatment System: Exhaust Leaks, Decomposition Tube Deposits
- Step 4 — Stationary Regeneration and Post-Regen Fault Check (1694, 3751, 3755)
- Step 5 — ECM Calibration Verification and Fault Code Clearing
Applicable truck models
This document applies to all vehicles equipped with Cummins ISB6.7, ISC8.3, ISL9, ISX11.9, and ISX15 engines using the CM2250 ECM platform (2010–2012 model years). These engines are found in medium- and heavy-duty trucks from manufacturers such as Freightliner, Kenworth, Peterbilt, International, and RAM. The SCR aftertreatment system covered here sits downstream of the diesel particulate filter and decomposition tube. For official Cummins technical resources, visit Cummins official website.
Who needs this Fault Code 3582 DTCs manual
Fleet mechanics, independent diesel technicians, and workshop owners diagnosing an amber CHECK ENGINE lamp caused by low NOx conversion efficiency across the SCR catalyst will find this guide essential. It requires access to the INSITE™ electronic service tool for fault code reading, stationary regeneration, dosing unit override testing, and final fault clearing.
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