Cummins fault code 556 is the Cummins ISX11.9 CM2250 diagnostic document for the crankcase pressure sensor circuit, logged as SPN 101, FMI 0/0 with a red lamp. The ECM illuminates the red lamp and reduces engine torque to protect the engine from excessive crankcase pressure. The crankcase pressure sensor is located near the crankcase ventilation filter; the code sets when crankcase pressure exceeds a calibrated value, indicating the crankcase breather filter requires maintenance. This DiagTechPro library page outlines what the official Cummins troubleshooting procedure contains before you download the full PDF.
Cummins fault code 556 document details
| Brand | Cummins |
| Model coverage | ISX11.9 CM2250 (2010-12), ISX12 CM2250 (2010-12) |
| System / Group | Crankcase Pressure Sensor Circuit — DTCs |
| Fault code / SPN / FMI | 556 / SPN 101 / FMI 0/0 |
| PID / Lamp | P101 / Red |
| Year / Revision | Not stated in the extract |
| Pages | 12 |
| 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
- Conditions for Clearing the Fault Code
- Shop Talk and troubleshooting steps
Applicable truck models and engines
This Cummins DTC applies to ISX11.9 CM2250 (2010-12) and ISX12 CM2250 (2010-12) engines, and the shared circuit information also references the ISB6.7, ISC8.3, ISL9 and ISX15 CM2250 platforms. Always match the crankcase pressure sensor wiring against the OEM diagram before testing, and confirm the diagnosis with the Cummins INSITE electronic service tool. Full engine specifications are published on the official Cummins website.
Who needs this Cummins fault code 556 manual
Workshop technicians, fleet maintenance teams and owner-operators diagnosing a crankcase pressure sensor concern on ISX11.9 or ISX12 CM2250 engines use this document to read the CM2250 diagnostic conditions, the action the ECM takes, and the exact steps to clear the code.
The complete PDF (12 pages) is available in the DiagTechPro manuals library; a free account is required to download it. This reference copy helps technicians prepare parts and test steps before servicing the engine.
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