This Fault Code 125 DTCs troubleshooting guide documents the complete diagnostic and repair procedure for DTC 125 — Intake Manifold 1 Pressure, Data Valid But Below Normal Operating Range, Moderately Severe Level — on ISX CM2250 engines. The 10-page PDF covers circuit description, fault conditions, step-by-step troubleshooting, and ECM calibration verification.
Official Fault Code 125 DTCs document details
| Brand | Cummins |
| Model coverage | ISX15 CM2250, ISX11.9 CM2250, ISB6.7 CM2250 (2010-12) |
| System/Group | Diagnostic Trouble Codes (DTCs) — Intake Manifold 1 Pressure/Temperature Sensor Circuit |
| Publication no. | Bulletin 4022250 (ISX15); Bulletin 2883445 (ISX11.9) |
| Year/Revision | Last Modified 07-Jan-2011 |
| Pages | 10 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview and Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- Fault Code 125 Summary (PID 102, SPN 102, FMI 18)
- Conditions for Setting the Fault Code
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk — Possible Causes
- Associated Procedures Table (Charge-Air Cooler 010-027, Intake Manifold Pressure/Temperature Sensor 019-159, ECM Calibration Code 019-032)
- Guided Step 1 — Check Fault Codes (1A, 1B)
- Guided Step 2 — Check Air Intake System for Leaks (2A Charge-Air Cooler, 2B Restricted Cooler, 2C EGR System)
- Guided Step 3 — Check Intake Manifold Pressure Sensor (3A)
- Guided Step 4 — Check ECM Calibration and Clear Fault Codes (4A, 4B)
Applicable truck models
This document applies to Cummins ISX15 CM2250, ISX11.9 CM2250, and ISB6.7 CM2250 (2010–2012) engine platforms. The ECM provides a 5-volt supply to the intake manifold pressure sensor; when detected charge flow falls below the minimum limit, DTC 125 is logged with an amber CHECK ENGINE lamp and engine power derate. Related fault codes referenced in the troubleshooting tree include 122, 123, 221, 222, 295, and 687. The procedure requires INSITE™ electronic service tool for data monitoring and fault clearing. For official engine support resources, visit Cummins Support.
Who needs this Fault Code 125 DTCs manual
Diesel mechanics and workshop owners diagnosing low boost or intake manifold pressure issues on CM2250-equipped trucks need this guide. It provides the exact decision tree — from checking related DTCs and charge-air cooler leaks to verifying EGR system integrity, sensor accuracy within 17 kPa (2.5 psi), and ECM calibration revision status.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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