Cummins fault code 312 is documented on this DiagTechPro library page for Cummins ISM CM871 (2007-09) engines, where it flags a Injector Solenoid Driver Cylinder 5 Circuit – Current Above Normal Or Grounded Circuit condition (PID S005, SPN 655, FMI 6/6, Amber lamp). This 6-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 312 overview
Cummins defines this code as “INJECTOR SOLENOID DRIVER CYLINDER 5 CIRCUIT – CURRENT ABOVE NORMAL OR GROUNDED CIRCUIT” on the Injector Solenoid Driver Cylinder 5 Circuit. The injector solenoid valves are actuated by the electronic control module (ECM) to control fuel metering and timing. Each injector solenoid is connected to the ECM by a supply and a return wire. An electrical pulse is sent to the injector from the ECM on the supply wire and returns to the ECM on the return wire after actuating the solenoid. Each solenoid valve is normally open, and it is only closed by an electrical pulse from the ECM during fuel injection and metering.
According to the shop talk notes, possible causes include:
- Open circuit in the engine harness, connectors, or actuator.
- Short circuit to ground in the engine harness or injector.
- Short circuit to voltage source in the engine harness.
- Low or high resistance in the injector.
Official document details
| Brand | Cummins |
| Model coverage | Cummins ISM CM871 (2007-09); Cummins ISX CM871 (2007-09) |
| System / Group | Injector Solenoid Driver Cylinder 5 Circuit — ISM CM871 fault codes |
| Fault code | 312 (SPN 655, FMI 6/6) |
| Source | TruckFaultCodes.com Cummins fault code reference (© 2017) |
| Pages | 6 |
| 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 312. 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 312 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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