fault code 242 DTCs is documented on this DiagTechPro library page for Cummins ISM CM871 (2007-09) engines, where it flags a Wheel-Based Vehicle Speed Sensor Circuit Tampering Has Been Detected – Abnormal Rate Of Change condition (PID P084, SPN 84, FMI 10/10, 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.
fault code 242 DTCs overview
Cummins defines this code as “WHEEL-BASED VEHICLE SPEED SENSOR CIRCUIT TAMPERING HAS BEEN DETECTED – ABNORMAL RATE OF CHANGE” on the Vehicle Speed Sensor Circuit. The vehicle speed sensor senses the speed of the tailshaft gear on the vehicle’s transmission. This speed signal is then transmitted to the engine electronic control module (ECM) and converted into a vehicle speed. Component location: The vehicle speed sensor is located in the rear of the vehicle transmission. Read the code with a diagnostic tool, confirm it is active, and follow the numbered troubleshooting steps before replacing any component.
Shop talk notes: Verify the electronic control module (ECM) calibration is correct. If necessary, recalibrate the ECM. Verify that the feature settings for the vehicle speed sensor anti-tampering (Fault Code 242), application type and automatic transmission are set correctly.
Official document details
| Brand | Cummins |
| Model coverage | Cummins ISM CM871 (2007-09); Cummins ISX CM871 (2007-09) |
| System / Group | Vehicle Speed Sensor Circuit — ISM CM871 fault codes |
| Fault code | 242 (SPN 84, FMI 10/10) |
| 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 242. 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 242 DTCs 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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