Cummins fault code 295 is documented on this DiagTechPro library page for Cummins ISM CM871 (2007-09) engines, where it flags a Barometric Pressure – Data Erratic, Intermittent, Or Incorrect condition (PID P108, SPN 108, FMI 2/2, Amber lamp). This 4-page PDF reproduces the manufacturer description, shop talk, component location and step-by-step troubleshooting so technicians can confirm and clear the code.
Cummins fault code 295 overview
Cummins defines this code as “BAROMETRIC PRESSURE – DATA ERRATIC, INTERMITTENT, OR INCORRECT” on the Barometric Pressure Circuit. The ambient air pressure sensor responds to pressure changes in the atmospheric pressure. The pressure changes occur based on elevation where the engine is currently operating. The ambient air pressure sensor has a 5 volt supply circuit, a sensor signal voltage, and a return circuit. The electronic control module (ECM) provides a 5 VDC supply to the ambient air pressure sensor on the sensor supply 1 circuit. The ECM also provides a ground on the sensor return circuit. The ambient air pressure sensor provides a signal to the ECM on the ambient air pressure sensor signal circuit.
Shop talk notes: Verify the electronic control module (ECM) calibration is correct. If necessary, recalibrate the ECM. At key-on, before the engine starts, the sensor readings for intake manifold pressure, exhaust gas pressure, and engine oil pressure are compared with the barometric pressure.
Official document details
| Brand | Cummins |
| Model coverage | Cummins ISM CM871 (2007-09); Cummins ISX CM871 (2007-09) |
| System / Group | Barometric Pressure Circuit — ISM CM871 fault codes |
| Fault code | 295 (SPN 108, FMI 2/2) |
| Source | TruckFaultCodes.com Cummins fault code reference (© 2017) |
| Pages | 4 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification (PID, SPN, FMI, lamp)
- Description
- Shop Talk
- 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 295. 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 Cummins fault code 295 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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