This 16-page troubleshooting guide covers Fault Code 3572 DTCs, which indicates the aftertreatment diesel exhaust fluid (DEF) pressure sensor voltage is below normal or shorted to a low source. The document details circuit descriptions, diagnostic conditions, step-by-step guided troubleshooting procedures, and repair verification for CM2250-based engines.
Official Fault Code 3572 DTCs document details
| Brand | Cummins |
| Model coverage | ISB6.7 CM2250, ISC8.3 CM2250, ISL9 CM2250, ISX11.9 CM2250, ISX15 CM2250, QSB6.7 CM2250, QSL9 CM2250, GX CM2250, ISF2.8 CM2220, ISF3.8 CM2220 |
| System/Group | Aftertreatment Diesel Exhaust Fluid Pressure Sensor Circuit (SPN 4334, FMI 4) |
| Publication no. | Bulletin 4022254 (ISB6.7 CM2250) |
| Year/Revision | Last modified 14-Dec-2010 |
| Pages | 16 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview — Circuit Description and Component Location
- Fault Code 3572 Summary — Code, Reason, Effect
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes (signal voltage less than 0.25 VDC for 1 second)
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk — Possible Causes
- Associated Procedures Table (011-057, 011-058, 019-032)
- Step 1 — Check the fault codes (1A: sensor supply fault codes, 1B: inactive fault code)
- Step 2 — Check the DEF pressure sensor and circuit (2A–2D: inspect connector pins, measure supply voltage 4.75–5.25 VDC, verify sensor condition)
- Step 3 — Check supply voltage and return circuit at the 86-pin controller connector (3A-1, 3A-2, 3B-1, 3B-2)
- Step 4 — ECM calibration verification and fault code disable (4A, 4B)
Applicable truck models
This procedure applies to all Cummins CM2250-controlled engines equipped with an aftertreatment DEF dosing system, specifically the ISB6.7, ISC8.3, ISL9, ISX11.9, ISX15, QSB6.7, QSL9, and GX platforms. It also references CM2220-based ISF2.8 and ISF3.8 engines. These engines are found in medium- and heavy-duty trucks from manufacturers such as RAM, Freightliner, Kenworth, Peterbilt, and PACCAR, model years 2010–2012. Related fault codes referenced in the guided steps include 3557, 3571, 3579, 3429, 3561, 1669, 1678, 3258, 3261, 3425, and 3576. For official technical service bulletins and calibration files, visit the Cummins technical support portal.
Who needs this Fault Code 3572 DTCs manual
Diesel technicians and workshop owners diagnosing an amber CHECK ENGINE lamp caused by a DEF pressure sensor low-voltage condition will use this guide. It requires INSITE™ electronic service tool access and basic multimeter skills for connector-pin and harness voltage measurements.
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