This Cummins fault code 124 document is a troubleshooting manual for intake manifold pressure readings above the normal operational range. It explains the ECM logic, sensor circuit, fault effects, clearing conditions, and guided diagnostic steps using INSITE™ electronic service tool and mechanical pressure checks.
Official Cummins fault code 124 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250 (2010-12); associated procedure table also lists ISX15 CM2250, GX CM2250, ISX11.9 CM2250, and QSL9 CM2250 |
| System/Group | DTCs; Intake Manifold 1 Pressure/Temperature Circuit |
| Year/Revision | Last Modified: 11-Jun-2010; troubleshooting section Last Modified: 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 – Check the sensor accuracy.
- Guided Step 3 – Check ECM calibration and clear fault codes.
Applicable truck models
The file is indexed under Cummins ISB6.7 CM2250 (2010-12) DTCs. The extracted procedure text identifies the intake manifold 1 pressure/temperature sensor in the air intake horn and references the ISX11.9 CM2250/ISX15 CM2250 intake manifold pressure/temperature circuit. The associated procedures table also lists ISX15 CM2250, GX CM2250, ISX11.9 CM2250, and QSL9 CM2250 for turbocharger Procedure 010-033, ECM Calibration Procedure 019-032, and Intake Manifold Pressure/Temperature Sensor Procedure 019-159. For manufacturer information, visit Cummins official website.
Who needs this Cummins fault code 124 manual
Workshop owners, diesel technicians, and fleet mechanics need this Cummins fault code 124 manual when a truck has an amber CHECK ENGINE lamp, MIL activity on OBD engines, or intake manifold pressure above the maximum operating limit. It is useful when checking active or inactive counts of Fault Codes 122, 123, 221, 222, or 295 and when separating sensor error from turbocharger, EGR valve, fuel system, or tampering causes.
The diagnostic sequence starts with fault-code review in INSITE™ electronic service tool, then verifies sensor accuracy with key ON and engine not running. If intake manifold pressure is not less than 203 mm-Hg [8 in-Hg], the document directs replacement of the intake manifold pressure sensor. A second check compares the service tool monitor value with a mechanical intake manifold pressure gauge; the acceptable comparison shown is within 127 mm-Hg [5 in-Hg]. Later checks cover oil in the intake manifold, turbocharger damage, variable geometry turbocharger tampering, fuel system tampering, fuel system add-on electronic devices, ECM calibration revision history, and clearing the code after repair.
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