The Cummins fault code 125 troubleshooting manual is the official Cummins procedure for diagnosing Intake Manifold 1 Pressure – Data Valid But Below Normal Operating Range – Moderately Severe Level. The electronic control module (ECM) provides a 5 volt supply to the intake manifold pressure sensor on the sensor supply circuit. The ECM also provides a ground on the sensor return circuit. The intake manifold pressure sensor provides a signal to the ECM on the intake manifold pressure sensor signal circuit. This sensor signal voltage changes, based on the pressure in the intake manifold. If the ECM detects that the necessary charge flow into the engine is below the minimum limit for a period of time, this fault code is logged. The amber warning lamp behaviour, the exact conditions that set and clear the code, and the guided steps that isolate the Intake Manifold 1 Pressure are documented in order.
Cummins fault code 125 document details
| Brand | Cummins |
|---|---|
| Model coverage | Cummins ISX11.9 CM2250 (2010-12), ISX12 CM2250 (2010-12) engines |
| System / Group | ISX11.9 CM2250 (2010-12) / DTCs |
| Fault code | 125 — SPN 102, FMI 18 |
| PID | 102 |
| Warning lamp | Amber |
| Year / Revision | 2010-12 (CM2250) |
| 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
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code is Active
- Associated Procedures and Troubleshooting Steps
- Guided circuit-response and connector checks
- Conditions for Clearing the Fault Code
Applicable truck models covered
This document applies to Cummins ISX11.9 CM2250 (2010-12), ISX12 CM2250 (2010-12) engines, within the shared Cummins CM2250 platform diagnostics. The guided steps rely on the Cummins INSITE electronic service tool to read active fault codes, monitor sensor data and confirm the repair once the Intake Manifold 1 Pressure has been serviced. Always confirm engine and calibration coverage against the official Cummins engine support site before ordering parts.
Who needs this Cummins fault code 125 manual
Diesel technicians and workshop owners servicing Cummins CM2250 platform engines use this file to work SPN 102, FMI 18 in the correct order instead of guessing at parts. It lists every conditions block, associated procedure and guided circuit-response check, with the connector and harness inspection points and the specification each step expects. Following the troubleshooting steps in sequence keeps the repair accountable and lets the technician confirm the fault is inactive once verified with the Cummins INSITE electronic service tool.
The full PDF, including the complete guided troubleshooting tree and specifications, is available in the DiagTechPro manuals library; a free account is required to download it.
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