This document is a Cummins fault code 471 troubleshooting manual for the ISB6.7 CM2150 engine oil level diagnostic. It explains the oil level sensor circuit, fault conditions, warning lamp behavior, likely causes, and INSITE™ service-tool steps for reading and clearing the code.
Official Cummins fault code 471 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISB, ISC, and ISL with CM2150 |
| System/Group | DTCs; Engine Oil Level Sensor |
| Publication no. | Not shown in extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 5 |
| 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 1A – Read the fault codes
- Guided Step 2 – Clear the fault codes
- Guided Step 2A – Disable the fault codes.
- Guided Step 2B – Clear the inactive fault codes.
Applicable truck models
This file applies to Cummins ISB6.7 CM2150 engines listed for 2007-09 in the document library entry. The extracted text also identifies ISB, ISC, and ISL with CM2150 as engines using the engine oil level sensor logic described here. The oil level sensor is located on the engine oil dipstick on the left side of the engine, and the diagnostic runs with the keyswitch ON and engine speed at 0 rpm. For manufacturer information, visit Cummins official website.
Who needs this Cummins fault code 471 manual
Workshop owners, diesel technicians, and fleet maintenance staff need this Cummins fault code 471 manual when a truck logs Engine Oil Level – Data Valid But Below Normal Operational Range – Least Severe Level. It is useful when checking whether the code is active, verifying oil level on level ground, adding lubricating oil, and using INSITE™ electronic service tool to confirm the fault becomes inactive.
The manual notes that low oil level at key-on can trigger the amber CHECK ENGINE light to flash for 30 seconds and may lead to derate, low oil pressure, or severe engine damage. Shop Talk also lists possible causes such as improper oil fill after service, external oil leaks, internal oil leaks into fuel or cooling systems, and high oil consumption or power cylinder failure with abnormal blowby under load. The full PDF is available in the DiagTechPro manuals library, free account required to download.
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