This document is a Cummins fault 2468 troubleshooting file for CM2250 engines, covering an engine crankshaft speed/position fault that is valid but above the normal operating range. It explains the air shutoff valve response, overspeed conditions, INSITE™ checks, ECM calibration review, and steps for clearing the fault after repair.
Official Cummins fault 2468 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; ISC8.3 and ISL9 CM2250; ISX15 CM2250; GX CM2250; ISX11.9 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Engine Crankshaft Speed/Position Sensor Circuit |
| Publication no. | Not stated; associated bulletin numbers include 4022254, 4022257, 4022250, and 2883445 |
| Year/Revision | Last modified 11-Jun-2010 and 29-Dec-2010 |
| Pages | 8 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- Fault Code 2468
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Identify the reason for the overspeed
- Guided Step 2 – Check ECM calibration and clear fault codes
Applicable truck models
The procedure applies to Cummins CM2250 engine platforms listed in the extract: ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, and ISX11.9 CM2250. The document states that the air shutoff valve is an OEM-installed component usually located on the air intake connection, so vehicle-specific placement must be checked in the OEM service manual. The fault is set when the ECM detects engine speed above 2500 RPM for 0.25 seconds, or when the operator manually trips the engine air shutoff valve. When active, the ECM illuminates the amber CHECK ENGINE lamp, closes the air shutoff valve, sets engine fueling to zero, and locks out the starter where equipped. For official brand information, visit Cummins official website.
Who needs this Cummins fault 2468 manual
Workshop owners, diesel technicians, fleet maintenance teams, and field mechanics need this Cummins fault 2468 manual when diagnosing overspeed shutdown events, air shutoff valve activation, or suspected crankshaft and camshaft speed sensor issues. It is also useful when using INSITE™ electronic service tool to compare RPM readings, review ECM calibration revisions, clear faults, and confirm that the fault code becomes inactive after the engine idles under the clearing conditions.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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