Cummins fault code 2637 is documented on this DiagTechPro library page for Cummins ISM CM871 (2007-09) engines, where it flags a Catalyst Face Plugged condition (PID SPN, SPN 5018, FMI 11/11). This 3-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 2637 overview
Cummins defines this code as “CATALYST FACE PLUGGED – ROOT CAUSE NOT KNOWN” on the Aftertreatment System. This fault code is set when the inlet face of the diesel oxidation catalyst is detected to be plugged with soot. The aftertreatment system is monitored by three temperature sensors that are located in the exhaust system. The temperature sensors around the aftertreatment diesel oxidation catalyst are used to monitor the temperature differential across the catalyst during active regeneration of the aftertreatment system.
According to the shop talk notes, possible causes include:
- Engine oil or fuel plugging the front face of the aftertreatment diesel oxidation catalyst.
Official document details
| Brand | Cummins |
| Model coverage | Cummins ISM CM871 (2007-09); Cummins ISX CM871 (2007-09) |
| System / Group | Aftertreatment System — ISM CM871 fault codes |
| Fault code | 2637 (SPN 5018, FMI 11/11) |
| Source | TruckFaultCodes.com Cummins fault code reference (© 2017) |
| Pages | 3 |
| 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 2637. Always confirm engine calibration and use a Cummins diagnostic tool such as INSITE to read live data before starting repairs. Full specifications are published on the Cummins official website.
Who needs this Cummins fault code 2637 manual
Heavy-duty truck technicians, fleet workshops and owner-operators diagnosing an electronic control module warning on ISM CM871 engines will 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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