This document is a code 2764 DTCs troubleshooting PDF for ISB6.7 CM2250 exhaust gas pressure diagnostics. It explains the circuit, fault conditions, service-tool checks, exhaust restriction testing, aftertreatment testing, ECM calibration review, and fault clearing steps.
Official code 2764 DTCs document details
| Brand | Cummins |
| Model coverage | ISB6.7 CM2250; associated coverage also lists ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250 |
| System/Group | DTCs / Exhaust Gas Pressure Sensor Circuit |
| Publication no. | 4022254 listed for ISB6.7 CM2250 associated procedures |
| Year/Revision | Last modified 11-Jun-2010 and 30-Dec-2010 |
| Pages | 9 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- 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 – Check the fault codes.
- Guided Step 2 – Perform the stationary regeneration procedure.
- Guided Step 3 – Check ECM calibration and clear fault codes.
Applicable truck models
This file applies to Cummins CM2250 engine diagnostics where Fault Code 2764, PID P131, SPN 1209, FMI 16 is used for “Exhaust Gas Pressure – Data Valid but Above Normal Operating Range – Moderately Severe Level.” The main file classification is ISB6.7 CM2250, while the associated procedure table also names ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250. For manufacturer information, visit Cummins official website.
Who needs this code 2764 DTCs manual
Workshop owners, diesel technicians, and fleet mechanics need this manual when a CM2250 engine logs high exhaust gas pressure and activates an amber CHECK ENGINE lamp with an engine derate. The procedure supports checks with INSITE™ electronic service tool, VGT and EGR related fault code review, exhaust restriction measurement, aftertreatment diesel particulate filter testing, and ECM calibration comparison.
The document describes the exhaust gas pressure sensor above the front section of the exhaust manifold and explains how the ECM uses a 5 VDC supply, sensor return, and signal circuit to monitor manifold pressure. It lists possible causes including a malfunctioning variable geometry turbocharger, a damaged in-range exhaust gas pressure sensor, a plugged or restricted aftertreatment diesel particulate filter, and a plugged or restricted EGR cooler. The guided checks include whether exhaust restriction is greater than 41 kPa [6 psi], whether related intake manifold pressure sensor or EGR differential pressure sensor faults are active, and whether fault codes appear during stationary regeneration.
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