Cummins ISM code 1117 is the Cummins ISM CM871 (2007-09) diagnostic reference for fault code 1117, the ECM power supply circuit DTC that is set active when ECM power is lost with the ignition on. This 6-page PDF from the Cummins ISX and ISM Troubleshooting and Repair documentation lists the fault identifiers, component description, and step-by-step checks. It carries PID S251, SPN 627, FMI 2/2, and lights a warning lamp.
Official document details
| Brand | Cummins |
| Model coverage | ISM CM871 (2007-09) and ISX CM871 engines |
| System / group | ISM CM871 (2007-09) / DTCs |
| Fault code | 1117 — SPN 627, FMI 2/2, PID S251 |
| Warning lamp | Not listed |
| Pages | 6 |
| File size | 0.4 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification (PID, SPN, FMI, warning lamp)
- Description
- Shop Talk
- Component location
- Troubleshooting steps
Cummins ISM code 1117 diagnosis
Fault code 1117 is set active when ECM power is lost with the ignition on. The ECM draws constant voltage from the batteries through unswitched battery wires and a switched input through the key switch. The code sets active if the ECM battery supply voltage drops below 6.2 VDC while the key switch is ON, and an active code can prevent aftertreatment soot load information from being saved. According to the Cummins Shop Talk guidance, technicians should first verify that the ECM calibration is correct and recalibrate if necessary before component replacement. Possible causes listed in the document include:
- Unswitched power routed from the starter instead of directly from the battery.
- Resistance in the ECM battery supply positive or negative circuits.
Applicable truck models and engines
This document applies to Cummins ISM CM871 (2007-09) engines and the closely related ISX CM871 platform used in on-highway trucks, so it suits heavy-duty tractors and vocational trucks fitted with these engines and their aftertreatment systems. Always confirm the engine dataplate and refer to the OEM troubleshooting and repair manual for chassis-specific pin numbers. Full specifications are published on the Cummins official website.
Who needs this Cummins ISM code 1117 manual
Diesel technicians, fleet mechanics, and workshop owners diagnosing the ECM power supply circuit on ISM CM871 engines will use this reference to read the fault identifiers correctly and follow the factory test sequence for code 1117.
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