Cummins fault code 1879 is the Cummins Aftertreatment Diesel Particulate Filter Differential Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source document for the ISX11.9 CM2250 (2010-12) engine platform, a 15-page PDF that reproduces the official fault code write-up read with Cummins INSITE. The ECM supplies 5 volts and a ground to the aftertreatment diesel particulate filter differential pressure sensor, a combination sensor that reads both filter differential pressure and outlet pressure.
Official document details
| Brand | Cummins |
| Model coverage | Cummins ISX11.9, ISX15, ISB6.7, ISC8.3 and ISL9 CM2250 |
| System / group | ISX11.9 CM2250 (2010-12) / DTCs |
| Fault code | 1879 — PID S324, SPN 3251, FMI 3/3 |
| Warning lamp | Amber |
| Publication reference | Cummins troubleshooting bulletin 2883445 (aftertreatment differential pressure sensor circuit) |
| Pages | 15 |
| File size | 0.2 MB |
| Format | |
| Language | English |
What Cummins fault code 1879 means
It sets when the differential pressure signal voltage is greater than 4.75 VDC for more than 2 seconds. A default differential pressure value is used, diesel exhaust fluid injection and both active and stationary regeneration are disabled, and the EGR valve closes. The document walks a technician through the summary and the guided troubleshooting steps needed to confirm and clear the code.
Document table of contents
- Overview and circuit description
- Component location
- 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
Applicable truck models
This troubleshooting document covers Cummins ISX11.9, ISX15, ISB6.7, ISC8.3 and ISL9 CM2250 engines in Class 6 to 8 trucks. It is filed under the ISX11.9 CM2250 (2010-12) / DTCs group and also applies to ISX12 CM2250 installations, so confirm the engine dataplate before ordering parts. Cross-reference the calibration revision with Cummins official engine support before clearing the code.
Who needs this Cummins fault code 1879 manual
Heavy-duty diesel technicians, fleet maintenance teams and workshop owners diagnosing a high-voltage DPF differential pressure sensor circuit use this reference to read SPN 3251 / FMI 3/3 correctly and to follow the guided steps in INSITE. The possible causes it lists include:
- an open return circuit
- a signal wire shorted to a voltage source
- a failed differential pressure sensor
The full 15-page PDF for diesel particulate filter fault code 1879 is available in the DiagTechPro manuals library; a free account is required to download.
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