Cummins fault code 2738 is documented on this DiagTechPro library page for Cummins ISM CM871 (2007-09) engines, where it flags a Start Enable Device 1 Circuit (Ether Injection) – Voltage Above Normal Or Shorted To High Source condition (PID S237, SPN 626, FMI 3/3, Amber lamp). This 5-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 2738 overview
Cummins defines this code as “START ENABLE DEVICE 1 CIRCUIT (ETHER INJECTION) – VOLTAGE ABOVE NORMAL OR SHORTED TO HIGH SOURCE” on the Ether Injection Start Circuit. The ether injection circuit is a device used by the engine to control the ether injection operation. The ether injection circuit utilizes a pulse width modulated (PWM) signal. A PWM signal is a pulsed voltage signal between 0 VDC and system voltage. The frequency of the pulsed voltage signal is dependent on the application requirement.
According to the shop talk notes, possible causes include:
- include:
- An open circuit in the engine harness or ether injection solenoid.
- A short circuit to voltage source in the OEM harness.
- A malfunctioning ECM.
Official document details
| Brand | Cummins |
| Model coverage | Cummins ISM CM871 (2007-09); Cummins ISX CM871 (2007-09) |
| System / Group | Ether Injection Start Circuit — ISM CM871 fault codes |
| Fault code | 2738 (SPN 626, FMI 3/3) |
| Source | TruckFaultCodes.com Cummins fault code reference (© 2017) |
| Pages | 5 |
| File size | 0.3 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 2738. 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 2738 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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