Cummins ISM Code 241 documents the Vehicle Speed Sensor Circuit Noise diagnostic and troubleshooting procedure for the Cummins ISM CM570 (1999-02) engine platform. This 6-page fault code sheet from TruckFaultCodes.com (Copyright 2017) covers fault code 241 (PID P084, SPN 84, FMI 2/2, YELLOW lamp) and the checks used to confirm and clear it.
Official document details
| Brand | Cummins |
|---|---|
| Model coverage | ISM CM570, ISX CM570, Signature CM570 (1999-02) |
| System / Group | Diagnostic Trouble Codes (DTCs) |
| Fault code | 241 — PID P084, SPN 84, FMI 2/2 |
| Warning lamp | YELLOW |
| Pages | 6 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Circuit description
- Component location
- Shop talk
- Troubleshooting steps
- Fault code verification and clearing
Cummins ISM Code 241 diagnostic steps
Diagnosis focuses on electrical noise and open circuits in the vehicle speed sensor wiring at the rear of the transmission. Technicians disconnect the OEM speedometer or trip-recorder connection to see whether the fault goes inactive, verify the OEM harness uses twisted pairs, and inspect the connector pins. Continuity and short-circuit checks then confirm whether the harness or sensor needs repair before the code is cleared with a diagnostic tool.
Applicable truck models
This sheet applies to Cummins ISM CM570, ISX CM570, and Signature CM570 (1999-02) engines built around the CM570 ECM and the vehicle speed sensor. The vehicle speed sensor is installed in the rear of the transmission. The document is laid out with a circuit description, a component location note, shop-talk tips, and a step-by-step troubleshooting chart whose go-to branches route the technician through each measurement. Refer to the official Cummins engine support site for wiring diagrams and component part numbers.
Who needs this Cummins ISM Code 241 manual
Heavy-duty diesel technicians, fleet service teams, and owner-operators diagnosing a yellow-lamp vehicle speed sensor fault will use this sheet to follow the factory decision tree, confirm the reading, and repair the harness, connector, or component instead of replacing parts on guesswork. It spells out each measurement threshold and its pass or fail branch, so the fault can be verified active, the repair validated, and the inactive code cleared with the diagnostic tool.
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