Cummins fault code 2351 is documented on this DiagTechPro library page for Cummins ISM CM871 (2007-09) engines, where it flags a EGR Valve Control Circuit – Voltage Below Normal, Or Shorted To Low Source condition (PID S146, SPN 2791, FMI 4/4, Amber lamp). 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 2351 overview
Cummins defines this code as “EGR VALVE CONTROL CIRCUIT – VOLTAGE BELOW NORMAL, OR SHORTED TO LOW SOURCE” on the EGR Valve Control Circuit. The exhaust gas recirculation (EGR) valve is a smart device and receives commands from the engine electronic control module (ECM) via the J1939 datalink. The EGR valve performs its own internal diagnostics and reports failures back to the primary engine ECM using the J1939 datalink. The EGR valve is opened by a motor located on top of the EGR valve. A motor shaft extends from the motor and contacts the dual-poppet valve to open the EGR valve. The EGR valve motor does not actually retract the EGR valve. The motor current is reduced and the spring pushes the EGR valve closed.
The document’s shop talk section highlights the following:
- Motor terminal short to ground internal to the EGR valve.
- Motor terminal short to battery internal to the EGR valve.
Official document details
| Brand | Cummins |
| Model coverage | Cummins ISM CM871 (2007-09); Cummins ISX CM871 (2007-09) |
| System / Group | EGR Valve Control Circuit — ISM CM871 fault codes |
| Fault code | 2351 (SPN 2791, FMI 4/4) |
| Source | TruckFaultCodes.com Cummins fault code reference (© 2017) |
| Pages | 3 |
| File size | 0.1 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 2351 on the EGR Valve Control Circuit. Always confirm engine calibration and use a Cummins diagnostic tool such as INSITE to read live data before starting repairs. Full engine specifications and service information are published on the Cummins official website.
Who needs this Cummins fault code 2351 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 SPN 2791 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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