This code 556 DTCs document is a troubleshooting manual for crankcase pressure diagnostics on CM2250 engines. It explains the circuit, fault logic, active-code effects, clearing conditions, related service procedures, and guided diagnostic steps using INSITE™.
Official code 556 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, with associated coverage listed for ISC8.3 and ISL9 CM2250, ISM11 CM876 SN, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250 |
| System/Group | DTCs; Crankcase Pressure Sensor Circuit; Crankcase Pressure – Data Valid but Above Normal Operational Range – Most Severe Level |
| Publication no. | 4022254 for ISB6.7 CM2250 associated procedures; other bulletin numbers listed include 4022257, 4022196, 4022250, 2883445, 4022256, and 4022255 |
| Year/Revision | Last Modified: 11-Jun-2010 and 18-Jan-2011 |
| Pages | 12 |
| 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 – Inspect the crankcase ventilation system.
- Guided Step 3 – Measure the Crankcase Blowby.
- Guided Step 4 – Check for progressive damage.
- Guided Step 5 – Check ECM calibration and clear fault codes.
Applicable truck models
The extract identifies Cummins ISB6.7 CM2250 as the listed file coverage and also shows associated procedures for ISC8.3 and ISL9 CM2250, ISM11 CM876 SN, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250 engines. The fault applies to a crankcase pressure sensor circuit where the ECM detects pressure above a calibrated value, illuminates the red CHECK ENGINE lamp, and reduces engine torque to protect the engine from excessive crankcase pressure. See the manufacturer at Cummins official website.
Who needs this code 556 DTCs manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this code 556 DTCs manual when a red lamp, high crankcase pressure reading, or repeated breather restriction fault requires a structured test path. The procedure helps confirm sensor accuracy, inspect breather parts, measure blowby, check for seal or gasket damage, review ECM calibration, and clear the code with INSITE™.
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