This fault code 3366 DTCs document is a troubleshooting PDF for a very low engine coolant level fault detected by the ECM. It explains the coolant level sensor circuit, fault logic, INSITE™ checks, ECM calibration review, and fault clearing steps for CM2250 engines. The file is useful when a truck logs SPN 111 FMI 18 with coolant level data valid but below normal operating range.
Official fault code 3366 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250 (2010-12) group listing; extract references ISX11.9 CM2250, ISX15 CM2250, GX CM2250, QSL9 CM2250, and QSB6.7 CM2250 associated procedures. |
| System/Group | DTCs; Engine Coolant Level Sensor Circuit; Cooling System; ECM Calibration Code |
| Publication no. | Not specified in the file extract. Associated bulletin numbers shown include 4022250, 2883445, 4022256, and 4022255. |
| Year/Revision | Last Modified: 11-Jun-2010 and 08-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
- FAULT CODE 3366 – Coolant Level – Data Valid But Below Normal Operating Range – Moderately Severe Level
- 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 – Check for Fault Code 3336.
- Guided Step 2 – Check ECM calibration and clear fault codes.
- Guided Step 2A – Check if an ECM calibration update is available.
- Guided Step 2B – Disable the fault code.
Applicable truck models
The document applies to Cummins CM2250 engine diagnostics where the ECM monitors the engine coolant level sensor in the radiator top tank or surge tank. The associated procedure table names ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250 engine models, with cooling system Procedure 008-018 and ECM Calibration Code Procedure 019-032 used during diagnosis. The file information places it in the Cummins ISB6.7 CM2250 (2010-12) DTC group, while the extracted pages also identify the ISX11.9 CM2250/ISX15 CM2250 engine coolant level sensor circuit. For OEM-specific sensor location, the document directs technicians to the original equipment manufacturer service manual. See the manufacturer website at Cummins official site.
Who needs this fault code 3366 DTCs manual
Workshop owners, diesel mechanics, and fleet technicians need this fault code 3366 DTCs manual when INSITE™ reports SPN 111 FMI 18 or active/inactive counts related to coolant level faults. The procedure supports coolant refill verification, Fault Code 3336 checks, ECM calibration comparison, and confirmation that the fault code becomes inactive after the clearing conditions run and pass.
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