This Cummins 3568 DEF dosing troubleshooting document provides the complete diagnostic and repair procedure for Fault Code 3568 — Aftertreatment Diesel Exhaust Fluid Dosing Valve, Mechanical System Not Responding or Out of Adjustment. It applies to Cummins CM2250 engine platforms and walks technicians through circuit checks, valve inspection, ECM calibration verification, and fault clearing using INSITE™ electronic service tool.
Official Cummins 3568 DEF dosing document details
| Brand | Cummins |
| Model coverage | ISB6.7 CM2250, ISC8.3 CM2250, ISL9 CM2250, ISX11.9 CM2250, ISX15 CM2250, ISF2.8 CM2220, ISF3.8 CM2220, GX CM2250 |
| System / Group | Aftertreatment — Diesel Exhaust Fluid Dosing Valve Circuit (DTC 3568, SPN 5394, FMI 7) |
| Publication no. | Bulletin 4022254 (ISB6.7 CM2250) |
| Year / Revision | Last modified 07-Dec-2010 |
| Pages | 9 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview — Circuit Description and Component Location
- Fault Code 3568 Summary — Code, Reason, Effect (Amber Lamp, SPN 5394, FMI 7)
- Conditions for Running the Diagnostics / Setting the Fault Code
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Associated Procedures Table (Procedures 011-059, 011-063, 019-032)
- Step 1 — Check the Fault Codes (INSITE™)
- Step 2 — Check the DEF Dosing Valve Circuit (pin-to-pin short, greater than 100k ohms)
- Step 3 — Check the Aftertreatment DEF Dosing Valve (stuck closed / low flow test)
- Step 4 — Check ECM Calibration and Clear Fault Codes
Applicable truck models
Fault Code 3568 troubleshooting applies to vehicles equipped with Cummins ISB6.7 CM2250 (2010–2012), ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, ISX15 CM2250, ISF2.8 CM2220, ISF3.8 CM2220 AN, and GX CM2250 engines fitted with a Selective Catalytic Reduction (SCR) aftertreatment system. Installation position of the dosing valve varies by OEM chassis. For engine specifications and current service bulletins, visit Cummins official website.
Who needs this Cummins 3568 DEF dosing manual
Diesel technicians and workshop owners diagnosing an amber CHECK ENGINE or MIL lamp triggered by DTC 3568 on CM2250-controlled engines will need this guide. It is essential for anyone performing DEF dosing valve replacement, harness continuity checks, or ECM calibration updates via INSITE™.
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