Cummins fault code 319 is the Cummins ISM CM871 (2007-09) diagnostic reference for Real-Time Clock Power Interrupt – Data Erratic, Intermittent or Incorrect, reported as PID P251, SPN 251, FMI 2/2 with an Amber (Maintenance Flashout) lamp. This 5-page workshop PDF covers the Real-Time Clock Power Circuit (ISX and ISM), 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 | Real-Time Clock Power Circuit (ISX and ISM) / DTCs |
| Fault identifiers | PID P251, SPN 251, FMI 2/2, Amber (Maintenance Flashout) lamp |
| Source | TruckFaultCodes.com fault-code library (© 2017) |
| Pages | 5 |
| File size | 0.32 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 319
Under normal conditions the real-time clock in the ECM is powered by the vehicle batteries, and if battery power to the ECM is lost it runs on a battery in the engine harness where fitted; this code indicates the real-time clock lost power.
The Cummins Shop Talk section advises confirming the ECM calibration is correct and recalibrating if necessary. Documented possible causes include:
- a weak or failed real-time clock battery
- failed wiring or connectors between the battery and ECM
- an engine with no real-time clock battery whose vehicle battery power to the ECM was lost
Component location manual information
The real-time clock battery is secured to the engine harness near the ECM.
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 319 manual
Fleet technicians, independent diesel mechanics and workshop owners diagnosing an active real-time clock power 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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