The Cummins fault code 2973 troubleshooting document is a 6-page factory diagnostic reference for the Cummins ISM and ISX CM871 (2007-09) engine platform, covering intake manifold pressure sensor (SPN 102, FMI 2/2). This fault code is logged when the intake manifold pressure signal is erratic, intermittent, or incorrect. 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 Circuit |
| Fault identifiers | SPN 102 · Lamp AMBER · FMI 2/2 |
| Source | TruckFaultCodes.com (© 2017) |
| Pages | 6 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Cummins fault code 2973 overview
This fault code is logged when the intake manifold pressure signal is erratic, intermittent, or incorrect. The ECM supplies 5 volts and a ground to the sensor and reads a signal that changes with manifold pressure; the value is checked at key-on and while running against turbocharger speed. Verify the ECM calibration is correct.
The document lists possible causes including:
- A malfunctioning intake manifold pressure or barometric pressure sensor
- Leaks between the turbocharger and intake manifold
- A restriction in the charge-air cooler
- A malfunctioning turbocharger speed sensor
- A plugged or restricted exhaust system or air filter restriction
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 pressure/temperature sensor is located in the air intake horn. 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 2973 manual
Fleet technicians and workshop owners diagnosing an erratic intake manifold pressure signal on ISM or ISX CM871 engines use this reference to follow the factory step order instead of guessing at the intake manifold pressure circuit. The full PDF is available in the DiagTechPro manuals library, and a free account is required to download.
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