This Cummins 2373 fault code document is a troubleshooting PDF for the exhaust gas pressure sensor circuit on Cummins ISB6.7 CM2150 engines. It covers SPN 1209 FMI 3/3, high signal voltage above 4.75 VDC, amber CHECK ENGINE lamp behavior, INSITE checks, connector inspection, harness testing, ECM response checks, and fault clearing steps.
Official Cummins 2373 fault code document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISB, ISC, and ISL exhaust gas pressure circuit |
| System/Group | DTCs; exhaust gas pressure sensor circuit |
| Year/Revision | Last Modified: 20-Jul-2010; model years 2007-09 shown in file information |
| Pages | 14 |
| File size | 0.3 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 – Check the exhaust gas pressure sensor and circuit.
- Guided Step 3 – Check the ECM and engine harness.
- Step 4 – Clear the fault code.
Applicable truck models
This file applies to Cummins ISB6.7 CM2150 engines in the 2007-09 coverage stated in the library record, and the diagnostic text identifies the ISB, ISC, and ISL exhaust gas pressure circuit. The procedure is written around the exhaust gas pressure sensor above the front section of the exhaust manifold, its 5 volt supply, sensor return, signal circuit, engine harness, ECM connector, and INSITE electronic service tool workflow. For official manufacturer information, visit Cummins.
Who needs this Cummins 2373 fault code manual
Workshop owners, diesel mechanics, and fleet technicians need this Cummins 2373 fault code manual when a truck logs Fault Code 2373, PID P131, SPN 1209, FMI 3/3 with high exhaust gas pressure signal voltage. It helps separate a failed sensor or connector issue from an open return circuit, signal wire short to supply or battery voltage, engine harness fault, or ECM-related condition.
The diagnostic sequence checks for Fault Code 227 first, then confirms whether Fault Code 2373 is active or inactive. It directs inspection for loose connectors, corroded pins, bent or broken pins, pushed back or expanded pins, moisture, damaged seals, dirt, wire insulation damage, broken connector shells, and damaged locking tabs. The circuit response test expects Fault Code 2374 active and Fault Code 2373 inactive when the sensor is disconnected, then the supply-to-return voltage check looks for 4.75 to 5.25 VDC at the sensor connector or ECM connector.
The closing steps reconnect all components, start the engine, idle for 1 minute, verify the fault is inactive with INSITE, and clear inactive fault codes. Full PDF available in the DiagTechPro manuals library, free account required to download.
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