Cummins fault code 1923 is the Cummins Aftertreatment Fuel Shutoff Valve 1 Circuit – Voltage Above Normal or Shorted to High Source document for the ISX11.9 CM2250 (2010-12) engine platform, a 11-page PDF that reproduces the official fault code write-up read with Cummins INSITE. The aftertreatment fuel shutoff valve disables the fuel supply to the aftertreatment system and sits in the aftertreatment shutoff valve assembly, driven by a pulse-width-modulated signal from the ECM.
Official document details
| Brand | Cummins |
| Model coverage | Cummins ISX11.9 CM2250 and ISX15 CM2250 |
| System / group | ISX11.9 CM2250 (2010-12) / DTCs |
| Fault code | 1923 — PID S334, SPN 3482, FMI 3/3 |
| Warning lamp | Amber |
| Publication reference | Cummins troubleshooting bulletin 2883445; procedures 011-052 and 019-031 |
| Pages | 11 |
| File size | 0.2 MB |
| Format | |
| Language | English |
What Cummins fault code 1923 means
It sets when the fuel shutoff valve PWM signal is detected at system voltage while the PWM output is commanded on. Active aftertreatment diesel particulate filter regeneration is disabled until the next key cycle, and engine torque is reduced after extended operation. The document walks a technician through the summary and the guided troubleshooting steps needed to confirm and clear the code.
Document table of contents
- Overview and circuit description
- Component location
- Conditions for running the diagnostics
- Conditions for setting the fault code
- Action taken when the fault code is active
- Conditions for clearing the fault code
- Shop Talk and possible causes
- Associated procedures and guided troubleshooting steps
Applicable truck models
This troubleshooting document covers Cummins ISX11.9 CM2250 and ISX15 CM2250 engines in Class 6 to 8 trucks. It is filed under the ISX11.9 CM2250 (2010-12) / DTCs group and also applies to ISX12 CM2250 installations, so confirm the engine dataplate before ordering parts. Cross-reference the calibration revision with Cummins official engine support before clearing the code.
Who needs this Cummins fault code 1923 manual
Heavy-duty diesel technicians, fleet maintenance teams and workshop owners diagnosing a high-side aftertreatment fuel shutoff valve circuit use this reference to read SPN 3482 / FMI 3/3 correctly and to follow the guided steps in INSITE. The possible causes it lists include:
- a fuel shutoff valve signal wire shorted to a voltage source in the harness
- a damaged aftertreatment fuel shutoff valve
The full 11-page PDF for aftertreatment fuel shutoff valve fault code 1923 is available in the DiagTechPro manuals library; a free account is required to download.
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