This Fault Code 1981 DTCs document is a troubleshooting procedure for aftertreatment particulate filter differential pressure on ISB, ISC, and ISL engines. It explains the circuit description, fault conditions, ECM actions, DPF inspection, sensor checks, calibration review, and fault-code clearing steps. The file is a 23-page English PDF for workshop use.
Official Fault Code 1981 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISB, ISC, and ISL |
| System/Group | DTCs; aftertreatment diesel particulate filter differential pressure |
| Publication no. | Not shown in extract |
| Year/Revision | Last Modified: 07-Jan-2011; overview section shows 20-Jul-2010 |
| Pages | 23 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Aftertreatment Particulate Filter Differential Pressure – Data Valid But Above Normal Operating Range – Least Severe Level
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check the fault codes
- Guided Step 2 – Inspect the aftertreatment diesel particulate filter differential pressure sensor
- Guided Step 3B – Inspect the aftertreatment wiring harness connectors for correct pin installation
- Guided Step 5 – Check if an ECM calibration update is available for Fault Code 1981
- Guided Step 7 – Inspect the exhaust
- Guided Step 8B – Disable the fault code
Applicable truck models
This procedure applies to Cummins ISB6.7 CM2150 engines from the 2007-09 file group, with the extract also naming ISB, ISC, and ISL aftertreatment differential pressure diagnostics. The aftertreatment diesel particulate filter is located in the exhaust system and installed by the OEM, so component location must be checked in the OEM service manual. For official brand information, visit Cummins official website.
Who needs this Fault Code 1981 DTCs manual
Mechanics, fleet technicians, and workshop owners need this manual when an amber CHECK ENGINE light is linked to SPN 3936 FMI 0/15, high DPF differential pressure, disabled EGR operation, or disabled active and stationary regeneration. It supports decisions on INSITE™ checks, DPF cleaning or replacement, temperature sensor connector verification, exhaust smoke inspection, turbocharger sector gear inspection, and ECM calibration updates.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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