This 11-page PDF is a Cummins ISB6.7 fault 3576 troubleshooting guide covering the aftertreatment diesel exhaust fluid (DEF) tank heater control valve circuit. It documents Fault Code 3576 — Current Below Normal or Open Circuit (SPN 3363, FMI 5) — and provides step-by-step diagnostic and repair procedures for mechanics working on CM2250-controlled engines.
Official Cummins ISB6.7 fault 3576 document details
| Brand | Cummins |
| Model coverage | ISB6.7 CM2250, ISC8.3 CM2250, ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250 |
| System / Group | Aftertreatment Diesel Exhaust Fluid Tank Heater Control Valve Circuit — DTCs |
| Publication no. | Bulletin 4022254 (ISB6.7), 4022257 (ISC8.3/ISL9), 4022250 (ISX15), 2883445 (ISX11.9) |
| Year / Revision | Last modified 31-Dec-2010 / 11-Jun-2010 |
| Pages | 11 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview — Circuit Description and Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Code (SPN 3363, FMI 5)
- Action Taken When the Fault Code is Active (amber CHECK ENGINE lamp, torque reduction, speed limitation)
- Conditions for Clearing the Fault Code
- Shop Talk — Possible Causes
- Step 1 — Check the Fault Codes (Step 1A: inactive fault code check)
- Step 2 — Check the DEF Tank Heater Control Valve and Circuit (Steps 2A–2C: connector inspection, circuit response with jumper wire, valve condition verification)
- Step 3 — Check the Aftertreatment DEF Controller and Harness (Steps 3A–3B: 86-pin connector inspection, open circuit resistance measurement — greater than 100k ohms threshold)
- Step 4 — Check ECM Calibration and Clear Fault Codes (Steps 4A–4B: calibration update check via INSITE™, disable and clear fault code)
Applicable truck models
This guide applies to vehicles equipped with the Cummins ISB6.7 CM2250 engine as well as ISC8.3/ISL9 CM2250, ISX15 CM2250, and ISX11.9 CM2250 platforms produced in the 2010–2012 period. The DEF tank heater control valve location varies by OEM chassis installation. Associated service procedures include Aftertreatment Diesel Exhaust Fluid Controller replacement (Procedure 011-057) and ECM Calibration Code verification (Procedure 019-032). For official support and service locator, visit Cummins official website.
Who needs this Cummins ISB6.7 fault 3576 manual
Diesel technicians and workshop owners diagnosing an amber CHECK ENGINE lamp triggered by Fault Code 3576 on CM2250-equipped trucks need this document. It is essential for cold-climate operations where DEF tank freezing causes disabled tank heating, progressive torque reduction, and eventual vehicle speed limitation to 8 km/h (5 mph).
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