Cummins fault code 2412 is documented on this DiagTechPro library page for Cummins ISM CM871 (2007-09) engines, where it flags a Fan Speed condition (PID P026, SPN 1639, FMI 2/2, Amber lamp). This 5-page PDF reproduces the manufacturer description, shop talk, component location and step-by-step troubleshooting so technicians can confirm and clear the code.
Cummins fault code 2412 overview
Cummins defines this code as “FAN SPEED – DATA ERRATIC, INTERMITTENT, OR INCORRECT” on the Fan Speed Sensor. The fan speed sensor is a variable reluctance speed sensor. It consists of a coil of wire and an iron core. The target on the fan hub shaft is a ground flat in the center of the shaft. The electronic control module (ECM) interprets this signal and converts it to a fan speed reading.
Official document details
| Brand | Cummins |
| Model coverage | Cummins ISM CM871 (2007-09); Cummins ISX CM871 (2007-09) |
| System / Group | Fan Speed Sensor — ISM CM871 fault codes |
| Fault code | 2412 (SPN 1639, FMI 2/2) |
| Source | TruckFaultCodes.com Cummins fault code reference (© 2017) |
| Pages | 5 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification (PID, SPN, FMI, lamp)
- Description
- Shop Talk
- Component Location
- Troubleshooting Steps
Applicable truck models and engines
This document applies to Cummins ISM CM871 (2007-09); Cummins ISX CM871 (2007-09) equipped diesel engines that log Fault Code 2412. Always confirm engine calibration and use a Cummins diagnostic tool such as INSITE to read live data before starting repairs. Full specifications are published on the Cummins official website.
Who needs this fault code 2412 manual
Heavy-duty truck technicians, fleet workshops and owner-operators diagnosing an electronic control module warning on ISM CM871 engines will use this sheet to verify the fault before parts are replaced.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download.
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