Cummins fault code 346 is the Cummins ISM CM871 (2007-09) diagnostic reference for Engine Control Module Calibration Memory Software – Bad Intelligent Device or Component, reported as PID 253, SPN 630, FMI 12 with an Amber lamp. This 3-page workshop PDF covers the Engine Control Module (ECM), giving the fault description, shop-talk notes, component location and the step-by-step troubleshooting tree. It is compiled from the TruckFaultCodes.com fault-code library (Copyright © 2017).
Official document details — Cummins fault code
| Brand | Cummins |
| Model coverage | ISM and ISX CM871 (2007-09) engines |
| System / Group | Engine Control Module (ECM) / DTCs |
| Fault identifiers | PID 253, SPN 630, FMI 12, Amber lamp |
| Source | TruckFaultCodes.com fault-code library (© 2017) |
| Pages | 3 |
| File size | 0.08 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code header (PID, SPN, FMI, lamp)
- Description
- Shop Talk
- Component Location
- Troubleshooting Steps
Reading Cummins fault code 346
Many ECM outputs and switched inputs — the accelerator interlock, powertrain protection torque limit, clutch pedal position, engine protection shutdown override, idle shutdown accessory relay and engine brake lamp — share a common wire on the OEM harness; this code logs when two features that share a common wire are enabled at once.
The Cummins Shop Talk section advises confirming the ECM calibration is correct and recalibrating if necessary. Documented possible causes include:
- two features that share a common OEM wire enabled simultaneously in the ECM
Component location manual information
The affected outputs or switched inputs are found in the OEM harness.
Applicable truck models
This document applies to Cummins ISM CM871 (2007-09) engines, and the same circuit description is shared with the ISX CM871 platform where noted in the extract. These engines power many Class 8 highway tractors and vocational trucks built by North American OEMs. Confirm the exact ECM calibration and OEM wiring against the manufacturer records; full engine support is published by Cummins official engine support.
Who needs this Cummins fault code 346 manual
Fleet technicians, independent diesel mechanics and workshop owners diagnosing an active ECM calibration memory fault condition will use this sheet to follow the correct troubleshooting order instead of replacing parts on guesswork.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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