This Cummins VSS fault document is a 3-page troubleshooting sheet for Fault Code 242 on the vehicle speed sensor circuit. It explains how the ECM reads vehicle speed, why the code can log, and which feature settings, wiring checks, and confirmation steps are used before clearing the fault.
Official Cummins VSS fault document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550 (1990-94) |
| System/Group | DTCs; Vehicle Speed Sensor (VSS) Circuit |
| Publication no. | Not shown |
| Year/Revision | Unknown; copywrite 2017 shown in source file |
| Pages | 3 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault Code: 242
- PID: P084
- SPN: 084
- FMI: 10
- Vehicle Speed Sensor Circuit
- Description
- Component Location
- Troubleshooting Steps
- Step 1A: Verify VSS antitampering setting
- Step 1B: Verify automatic transmission setting
- Step 1C: Verify application type setting
- Step 2A: Inspect the VSS
- Step 2B: Inspect the OEM VSS circuit
- Step 2C: Monitor vehicle speed
- Step 3A: Disable the fault code
- Step 3B: Clear inactive fault codes
Applicable truck models
This document applies to Cummins ISB CM550 (1990-94) diagnostics where Fault Code 242 is used for the Vehicle Speed Sensor (VSS) Circuit. The extract identifies the VSS as most commonly installed in the rear of the transmission and covers applications with manual or automatic transmission feature settings, OEM harness wiring, dash speedometer comparison, chassis dynamometer or road testing, and ECM vehicle speed parameters. It does not name a specific truck make or chassis model, so the coverage should be treated as engine and control-system based rather than vehicle-model specific. For current manufacturer information, visit Cummins official website.
Who needs this Cummins VSS fault manual
Mechanics, fleet technicians, and workshop owners need this Cummins VSS fault manual when Fault Code 242, SPN 084, FMI 10 is active or inactive and the vehicle speed reading, VSS antitampering feature, or OEM harness must be checked. It is useful when deciding whether the issue is incorrect ECM feature setup, driver action, VSS mounting, harness tampering, or a speed signal that is unreasonable for the present gear.
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