The Cummins fault code 2964 troubleshooting document is a 2-page factory diagnostic reference for the Cummins ISM and ISX CM871 (2007-09) engine platform, covering intake manifold temperature high (SPN 105, FMI 0/15). This fault code indicates the intake manifold 1 temperature has exceeded the maximum engine-protection limit at the least severe level. This page summarises what the manual contains so a technician can confirm it matches the code before downloading.
Official document details
| Brand | Cummins |
| Model coverage | ISM & ISX CM871 (2007-09) |
| System / group | ISM CM871 (2007-09) / DTCs |
| Circuit | ISX and ISM Intake Manifold 1 Pressure/Temperature Sensor |
| Fault identifiers | SPN 105 · FMI 0/15 |
| Source | TruckFaultCodes.com (© 2017) |
| Pages | 2 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Cummins fault code 2964 overview
This fault code indicates the intake manifold 1 temperature has exceeded the maximum engine-protection limit at the least severe level. The variable-resistor sensor measures the temperature of the charge-air entering the manifold, and the ECM reads the resistance change as a signal voltage. When the intake air is warm the sensor resistance is low and the ECM senses a high temperature. Verify the ECM calibration is correct and compare the reading to a mechanical gauge.
The document lists possible causes including:
- Plugged charge-air cooler fins
- Restricted airflow through the charge-air cooler
- An undersized charge-air cooler
- High turbocharger compressor outlet temperature
Document table of contents
- Description
- Shop Talk
- Component Location
- Troubleshooting Steps
Applicable truck models covered
This procedure applies to Cummins ISM and ISX engines built on the CM871 (2007-09) electronic control platform, as fitted by truck makers using this Cummins driveline. The intake manifold 1 temperature sensor is located in the air intake manifold. For wiring, connector, and CPL detail, refer to the Cummins official engine support site or the OEM service manual.
Who needs this Cummins fault code 2964 manual
Fleet technicians and workshop owners diagnosing high intake manifold temperature on ISM or ISX CM871 engines use this reference to follow the factory step order instead of guessing at the intake manifold temperature circuit. The full PDF is available in the DiagTechPro manuals library, and a free account is required to download.
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