The Cummins fault code 2739 troubleshooting document is a 5-page factory diagnostic reference for the Cummins ISM and ISX CM871 (2007-09) engine platform, covering ether injection start enable (SPN 626, FMI 4/4). This fault code is logged when the ECM commands 12 VDC to the ether injection solenoid but the signal-circuit voltage is below 12 VDC, indicating voltage below normal or shorted to a low source. This page summarises what the manual contains so a technician can confirm it matches the code before downloading.
Official document details
| Brand | Cummins |
| Model coverage | ISM & ISX CM871 (2007-09) |
| System / group | ISM CM871 (2007-09) / DTCs |
| Circuit | ISX and ISM Ether Injection Circuit |
| Fault identifiers | SPN 626 · Lamp AMBER · FMI 4/4 |
| Source | TruckFaultCodes.com (© 2017) |
| Pages | 5 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Cummins fault code 2739 overview
This fault code is logged when the ECM commands 12 VDC to the ether injection solenoid but the signal-circuit voltage is below 12 VDC, indicating voltage below normal or shorted to a low source. The start enable device 1 circuit uses a pulse-width-modulated signal between 0 VDC and system voltage. Verify the ECM calibration is correct.
The document lists possible causes including:
- A short circuit to ground in the OEM harness or the ether injection solenoid
- Low internal resistance of the ether injection solenoid
- Dirty or damaged connector pins at the solenoid or ECM connector
Document table of contents
- Description
- Shop Talk
- Component Location
- Troubleshooting Steps
Applicable truck models covered
This procedure applies to Cummins ISM and ISX engines built on the CM871 (2007-09) electronic control platform, as fitted by truck makers using this Cummins driveline. The ether injection control solenoid location varies by OEM; refer to the OEM manual. For wiring, connector, and CPL detail, refer to the Cummins official engine support site or the OEM service manual.
Who needs this Cummins fault code 2739 manual
Fleet technicians and workshop owners diagnosing a low ether injection signal voltage on ISM or ISX CM871 engines use this reference to follow the factory step order instead of guessing at the ether injection circuit. The full PDF is available in the DiagTechPro manuals library, and a free account is required to download.
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