Code 143 DTCs identifies this official workshop document.
This 6-page Cummins document is the official diagnostic procedure for Fault Code 143, covering engine oil rifle pressure conditions on CM2250-series engines. It details the circuit description, fault-setting conditions, ECM responses, and a guided troubleshooting sequence to resolve low oil pressure faults. The file is provided in PDF format at 0.2 MB.
Official Code 143 DTCs document details
| Brand | Cummins |
| Model coverage | ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, ISM11 CM876, ISL8.9 CM2150, ISZ13 CM2150, QSL9 CM2250, QSB6.7 CM2250 |
| System / Group | DTCs — Engine Oil Rifle Pressure (SPN 100, FMI 18) |
| Publication no. | — |
| Year / Revision | Last modified 30-Dec-2010 |
| Pages | 6 |
| 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 — ECM Calibration Code (Procedure 019-032)
- Troubleshooting Steps: Step 1 — Check the Fault Codes; Step 1A — Check for Fault Code 143
- Guided Step 2 — Check ECM Calibration and Clear Fault Codes; Step 2A — Check if an ECM Calibration Update Is Available
- Guided Step 2B — Disable the Fault Code
Applicable truck models
Code 143 DTCs applies across multiple engine platforms using the CM2250 and CM2150 control modules. Engines explicitly listed include ISB6.7 CM2250 (bulletin 4022254), ISC8.3 and ISL9 CM2250 (bulletin 4022257), ISX15 CM2250 (bulletin 4022250), ISX11.9 CM2250 (bulletin 2883445), ISM11 CM876 (bulletin 4022196), ISL8.9 CM2150 (bulletin 4022190), ISZ13 CM2150 (bulletin 4022133), QSL9 CM2250 (bulletin 4022256), and QSB6.7 CM2250 (bulletin 4022255). These powertrains serve medium- and heavy-duty truck, bus, and industrial applications. The ECM monitors the engine oil pressure sensor via a 5-volt supply on the sensor supply circuit and triggers the amber CHECK ENGINE lamp with a torque derate when pressure drops below protection limits for more than 5 seconds. Troubleshooting references the INSITE™ electronic service tool and Procedure 019-032 for calibration updates. For additional technical resources, visit the Cummins official website.
Who needs this Code 143 DTCs manual
Diesel mechanics, fleet maintenance technicians, and workshop owners working on Cummins CM2250 or CM2150 engines will use this procedure whenever Fault Code 143 appears. The guided steps walk through verifying active or inactive fault status, checking ECM calibration revisions, and clearing the code once oil pressure returns to normal range.
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