Cummins fault code 1852 is the official Cummins troubleshooting manual for the Water-in-Fuel Indicator fault on ISX11.9 CM2250 engines. This 6-page PDF documents SPN 97, FMI 16, and the amber-lamp response, and it walks through the circuit description, the guided diagnostic steps, and the exact conditions for setting and clearing the code. The water-in-fuel sensor is integrated into the bottom of the fuel filter and sends a signal to the ECM once a set volume of water has accumulated. The water-in-fuel circuit uses a ground wire and a signal wire.
Official document details
| Brand | Cummins |
| Model coverage | ISX11.9 CM2250 and ISX12 CM2250 (2010–2012) |
| System / Group | Diagnostic Trouble Codes (DTCs) — Water-in-Fuel Indicator |
| Fault code | 1852 (SPN 97, FMI 16) |
| Fault description | Water-in-Fuel Indicator — Data Valid But Above Normal Operating Range – Moderately Severe Level |
| Warning lamp | Amber |
| Reference | Cummins INSITE service tool; Procedure 019-032 (ECM Calibration Code) |
| Pages | 6 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Cummins fault code 1852 table of contents
- Overview and circuit description
- Component location
- Conditions for running the diagnostics
- Conditions for setting fault code 1852
- Action taken when the fault code is active
- Conditions for clearing the fault code
- Shop Talk service notes
- Guided troubleshooting steps and associated procedures
Applicable truck models and engines
This document applies to Cummins ISX11.9 CM2250 and ISX12 CM2250 engines from the 2010–2012 range fitted in heavy-duty on-highway trucks. The SPN 97 / FMI 16 definition and the guided steps follow the same fault-code logic Cummins publishes for its CM2250 platform, so always confirm the ECM calibration on the vehicle against the current revision using the Cummins INSITE electronic service tool. Verify engine coverage on the Cummins official website before ordering parts.
Who needs this Cummins fault code 1852 manual
Any technician or workshop owner diagnosing Cummins fault code 1852 on an ISX11.9 CM2250 engine needs this procedure to work through the fault correctly. Because water can severely damage the tight-tolerance fuel-system components, the manual instructs technicians to drain the fuel filter immediately and validate the repair with a one-minute idle. The manual ends with the associated-procedures table and the “Reset All Faults” clearing steps so the repair can be validated.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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