Cummins fault code 1963 is documented on this DiagTechPro library page for Cummins ISM CM871 (2007-09) engines, where it flags the (ism) Aftertreatment Fuel Shutoff Valve 1 – Mechanical System Not Responding Properly or Out of Adjustment condition (PID 332, SPN 3482, FMI 7, Amber lamp). This 7-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 1963 overview
Cummins identifies this code as “(ism) Aftertreatment Fuel Shutoff Valve 1 – Mechanical System Not Responding Properly or Out of Adjustment” on the Aftertreatment Fuel Injector System. This fault code checks for system errors in the aftertreatment fuel injection system. This diagnostic can detect fuel leaks in the system, as well as failures of the aftertreatment fuel injector, aftertreatment fuel shutoff valve, and aftertreatment fuel drain valve. Every time the engine is started, a diagnostic test on the system is performed. The aftertreatment fuel drain valve opens and relieves fuel pressure in the line. The aftertreatment fuel pressure sensor must be reading atmospheric pressure at this point in the test.
According to the shop talk notes, possible causes include:
- Stuck closed aftertreatment fuel shutoff valve.
- Fuel restriction between the fuel system and the aftertreatment fuel shutoff valve assembly.
- On ISM engines, remove the aftertreatment fuel line connection from the cylinder head.
Official document details
| Brand | Cummins |
| Model coverage | Cummins ISM CM871 (2007-09); Cummins ISX CM871 (2007-09) |
| System / Group | Aftertreatment Fuel Injector System — ISM CM871 fault codes |
| Fault code | 1963 (SPN 3482, FMI 7) |
| PID | 332 |
| Warning lamp | Amber |
| Source | TruckFaultCodes.com Cummins fault code reference (© 2017) |
| Pages | 7 |
| 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 1963. Always confirm engine calibration and use a Cummins diagnostic tool such as INSITE to read live data before replacing parts. Full specifications are published on the Cummins official website.
Who needs this Cummins fault code 1963 manual
Heavy-duty truck technicians, fleet workshops and owner-operators diagnosing an electronic control module warning on ISM CM871 engines 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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