Cummins fault code 3256 is a diagnostic trouble code for the Cummins ISX11.9 CM2250 (2010-12) engine that documents the aftertreatment diesel particulate filter outlet temperature. This 14-page troubleshooting manual explains what sets the code, the amber warning lamp it activates, and the guided repair steps a technician performs with the Cummins INSITE electronic service tool. It corresponds to SPN 3246 and FMI 15.
Official document details
| Brand | Cummins |
| Model coverage | ISX11.9 CM2250 (2010-12), ISX12 CM2250 (2010-12) |
| System / Group | DTCs – Aftertreatment Diesel Particulate Filter Outlet Temperature |
| Reference codes | SPN 3246, FMI 15, Amber lamp |
| Revision | Last modified 11-Jun-2010 |
| Pages | 14 |
| File size | 0.22 MB |
| Format | |
| Language | English |
Document table of contents
- Overview and circuit description
- Fault code information (SPN 3246, FMI 15, Amber lamp)
- Conditions for running the diagnostics
- Conditions for setting the fault code
- Action taken when the fault code is active
- Conditions for clearing the fault code
- Shop talk and possible causes
- Associated procedures and guided troubleshooting steps
Trucks affected by Cummins fault code 3256
The procedure applies to Cummins ISX11.9 CM2250 (2010-12) engines and the related ISX11.9 CM2250 (2010-12), ISX12 CM2250 (2010-12) platforms fitted to Class 8 on-highway trucks. The steps rely on the Cummins INSITE electronic service tool to read the fault code, monitor the aftertreatment diesel particulate filter outlet temperature, and validate the repair. For engine and emissions specifications, consult the Cummins official website.
Who needs this Cummins fault code 3256 manual
Diesel technicians and fleet workshop owners diagnosing DPF outlet temperature high on ISX11.9 CM2250 engines use this manual to follow the factory-correct sequence instead of guessing at parts. Working from the documented running and setting conditions shortens diagnosis time and helps avoid unnecessary aftertreatment component replacement before the true root cause is confirmed.
Cummins lists the documented causes a technician should rule out, including:
- Excessive engine oil or diesel fuel being introduced into the exhaust system from the engine
- A damaged engine fuel injector causing unburned diesel fuel to enter the exhaust system
- The aftertreatment diesel particulate filter outlet temperature sensor malfunctioned inrange
- A face plugged aftertreatment diesel oxidation catalyst
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