fault code 2638 DTCs is the Cummins ISX11.9 CM2250 troubleshooting document for Aftertreatment Diesel Oxidation Catalyst Conversion Efficiency – Data Valid But Below Normal Operating (SPN 5298, FMI 17). This 10-page factory guide explains the circuit, the conditions that set the code, and the guided repair steps used with the INSITE electronic service tool. The aftertreatment system is monitored by three temperature sensors that are located in the exhaust system.
Official document details
| Brand | Cummins |
| Model coverage | ISX11.9 CM2250/ISX15 CM2250 |
| System / group | ISX11.9 CM2250 (2010-12) / DTCs |
| Fault code | 2638 (PID S380) |
| SPN / FMI | 5298 / 17 |
| Warning lamp | None |
| Bulletin number | 2883445 |
| Revision | Last modified 15-Sep-2010 |
| Pages | 10 |
| File size | 0.2 MB |
| Format | |
| Language | English |
fault code 2638 DTCs 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 table
- Guided troubleshooting steps
Applicable truck models
This troubleshooting procedure applies to Cummins ISX11.9 CM2250/ISX15 CM2250 engines. The aftertreatment diesel oxidation catalyst is located in the exhaust system. The location of the catalyst can vary depending on the original equipment manufacturer. The document states the code is set when ecm detects that the temperature differential across the aftertreatment diesel oxidation catalyst during active regeneration is not matching the expected temperature increase. When the code is active, no dashboard warning lamp is commanded on for this information fault code. Full specifications and procedure references are published by Cummins on the Cummins official website.
Who needs this fault code 2638 DTCs manual
Diesel technicians and workshop owners diagnosing Data Valid But Below Normal Operating on ISX11.9 CM2250 engines need this reference. Possible causes documented in the Shop Talk section include soot plugging the front face of the aftertreatment diesel, engine oil or fuel contamination of the aftertreatment diesel, cracked or contaminated aftertreatment diesel oxidation catalyst, damage in the aftertreatment fuel injection system. The guide walks through each guided step and the INSITE electronic service tool tests required to validate the repair and clear the code.
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