Cummins fault code 1981 is documented on this DiagTechPro library page for Cummins ISM CM871 (2007-09) engines, where it flags the Aftertreatment Particulate Filter Differential Pressure – Data Valid but Above Normal Operational Range – Least Severe Level condition (PID S324, SPN 3251, FMI 0/15, Amber lamp). This 5-page PDF reproduces the manufacturer description, shop talk, component location and step-by-step troubleshooting so technicians can confirm and clear the code.
Cummins fault code 1981 overview
Cummins identifies this code as “Aftertreatment Particulate Filter Differential Pressure – Data Valid but Above Normal Operational Range – Least Severe Level” on the Aftertreatment Differential Pressure. The engine aftertreatment system monitors the soot load in the aftertreatment diesel particulate filter.
According to the shop talk notes, possible causes include:
- The aftertreatment diesel particulate filter can be plugged with soot. The engine has been operating in light load conditions that prevent exhaust temperatures from being high enough to actively regenerate the aftertreatment particulate filter.
- The aftertreatment wiring harness connectors could be connected to the wrong aftertreatment exhaust gas temperature sensor.
- The aftertreatment wiring harness or aftertreatment exhaust gas temperature sensor connector pin installation could be incorrect.
- The aftertreatment diesel particulate filter differential pressure sensor has malfunctioned.
Official document details
| Brand | Cummins |
| Model coverage | Cummins ISM CM871 (2007-09); Cummins ISX CM871 (2007-09) |
| System / Group | Aftertreatment Differential Pressure — ISM CM871 fault codes |
| Fault code | 1981 (SPN 3251, FMI 0/15) |
| PID | S324 |
| Warning lamp | Amber |
| Source | TruckFaultCodes.com Cummins fault code reference (© 2017) |
| Pages | 5 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification (PID, SPN, FMI, lamp)
- Description
- Shop Talk
- Component Location
- Troubleshooting Steps
Applicable truck models and engines
This document applies to Cummins ISM CM871 (2007-09); Cummins ISX CM871 (2007-09) equipped diesel engines that log Fault Code 1981. Always confirm engine calibration and use a Cummins diagnostic tool such as INSITE to read live data before replacing parts. Full specifications are published on the Cummins official website.
Who needs this Cummins fault code 1981 manual
Heavy-duty truck technicians, fleet workshops and owner-operators diagnosing an electronic control module warning on ISM CM871 engines use this sheet to verify the fault before parts are replaced.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download.
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