This fault code 555 DTCs document is a troubleshooting procedure for crankcase pressure faults on CM2150 engines. It explains the fault reason, diagnostic conditions, likely causes, INSITE checks, crankcase ventilation inspections, blowby checks, and fault-code clearing steps.
Official fault code 555 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; crankcase ventilation and breather system |
| Publication no. | Not stated for this PDF; referenced service manuals include Bulletin 4021578, Bulletin 4021569, and operation manual Bulletin 4021579 |
| Year/Revision | Last Modified: 08-Jan-2008 and 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.
Applicable truck models
This file applies to Cummins ISB and QSB3.3 CM2150 engines and to ISC and ISL CM2150 engines covered by the fault-code path selection. The extract identifies Fault Code: 555, PID: P101, SPN: 101, FMI: 0/16, with an amber CHECK ENGINE light when crankcase pressure exceeds a calibrated value. The procedure uses INSITE electronic service tool readings, service records, crankcase ventilation filter inspection, crankcase breather checks, air intake restriction checks, and crankcase blowby measurement. See the manufacturer source at Cummins official website.
Who needs this fault code 555 DTCs manual
Workshop owners, diesel mechanics, and fleet technicians need this code 555 DTCs manual when diagnosing high crankcase pressure on CM2150 engines. It is useful when checking sensor accuracy, filter service interval, frozen or plugged hoses, oil drain tubes, check valves, oil separator restriction, high air intake restriction, and excessive crankcase gases.
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