Cummins fault code 1974 is documented on this DiagTechPro library page for Cummins ISM CM871 (2007-09) engines, where it flags the Maintenance Crankcase Pressure – Data Valid but Above Normal Operational Range – Least Severe Level condition (PID P101, SPN 101, FMI 0/15). This 2-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 1974 overview
Cummins identifies this code as “Maintenance Crankcase Pressure – Data Valid but Above Normal Operational Range – Least Severe Level” on the Crankcase Pressure Sensor. The crankcase pressure sensor is used to monitor the pressure inside the crankcase. The electronic control module (ECM) supplies the crankcase pressure sensor a 5 volt reference voltage. When the crankcase pressure is low, the sensor signal voltage is low. When the crankcase pressure is high, the sensor signal voltage is near the 5 volt reference voltage. The ECM monitors the crankcase pressure signal circuit voltage to calculate the pressure of the air within the crankcase.
According to the shop talk notes, possible causes include:
- Crankcase breather filter needs to be replaced.
Official document details
| Brand | Cummins |
| Model coverage | Cummins ISM CM871 (2007-09); Cummins ISX CM871 (2007-09) |
| System / Group | Crankcase Pressure Sensor — ISM CM871 fault codes |
| Fault code | 1974 (SPN 101, FMI 0/15) |
| PID | P101 |
| Source | TruckFaultCodes.com Cummins fault code reference (© 2017) |
| Pages | 2 |
| File size | 0.1 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 1974. Always confirm engine calibration and use a Cummins diagnostic tool such as INSITE to read live data before replacing parts. Full specifications are published on the Cummins official website.
Who needs this Cummins fault code 1974 manual
Heavy-duty truck technicians, fleet workshops and owner-operators diagnosing an electronic control module warning on ISM CM871 engines 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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