This fault code 556 DTCs document is a troubleshooting procedure for crankcase pressure faults on CM2150 engines. It explains the circuit, fault conditions, derate action, likely causes, INSITE checks, crankcase ventilation inspections, blowby measurement, and final clearing steps.
Official fault code 556 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB and QSB3.3 CM2150; ISC and ISL CM2150 |
| System/Group | ISB6.7 CM2150 (2007-09) / DTCs; crankcase pressure sensor circuit and crankcase ventilation system |
| Publication no. | Fault Code 08-fc556; references ISB CM2150 Service Manual Bulletin 4021578, ISC and ISL CM2150 Service Manual Bulletin 4021569, and ISC and ISL CM2150 Operation and Maintenance Manual Bulletin 4021579 |
| Year/Revision | Last Modified: 03-Jan-2008; procedure sections revised 20-Jul-2010 |
| Pages | 22 |
| File size | 0.5 MB |
| Format | |
| Language | English |
Document table of contents
- Fault Code Path Selection
- 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 – Check air intake restriction.
- Guided Step 4 – Measure the crankcase blowby.
- Guided Step 5 – Clear the fault code and check for progressive damage.
Applicable truck models
This file applies to Cummins ISB, QSB3.3, ISC, and ISL CM2150 engines where Fault Code: 556, PID: P101, SPN: 101, FMI: 0/0 is logged for crankcase pressure data valid but above normal operational range. The extract identifies ISB and QSB3.3 CM2150 crankcase pressure sensor circuit coverage, plus separate ISC and ISL CM2150 procedures for breather filter, oil separator, drain tube, check valve, breather tube, blowby measurement, and progressive damage inspection. It does not name truck makes or chassis models. See the manufacturer source at Cummins official website.
Who needs this fault code 556 DTCs manual
Workshop owners, diesel mechanics, and fleet technicians need this manual when a red STOP ENGINE lamp, engine power derate, or repeated high crankcase pressure complaint appears on a CM2150 engine. The checks focus on the crankcase pressure sensor, crankcase ventilation filter, closed crankcase ventilation hose, oil drain tubes, check valves, oil separator, air intake restriction, and crankcase blowby.
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