The Cummins fault code 2789 troubleshooting document is a 2-page factory diagnostic reference for the Cummins ISM and ISX CM871 (2007-09) engine platform, covering engine coolant temperature low (SPN 110, FMI 1/18). This fault code indicates engine coolant temperature is below the calibrated limit at a moderately 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 Coolant Temperature Sensor Circuit |
| Fault identifiers | SPN 110 · FMI 1/18 |
| Source | TruckFaultCodes.com (© 2017) |
| Pages | 2 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Cummins fault code 2789 overview
This fault code indicates engine coolant temperature is below the calibrated limit at a moderately severe level. The variable-resistor coolant temperature sensor measures engine coolant temperature and the ECM reads the resistance change on a 5-volt signal circuit. Verify the ECM calibration is correct and compare the reading to a known value.
The document lists possible causes including:
- Coolant temperature below the calibrated limit stored in the ECM
- A coolant temperature sensor reading that does not correlate to a mechanical gauge
- A damaged engine coolant temperature sensor
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 engine coolant temperature sensor is on the exhaust side of the engine near the thermostat housing. 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 2789 manual
Fleet technicians and workshop owners diagnosing low engine coolant temperature on ISM or ISX CM871 engines use this reference to follow the factory step order instead of guessing at the coolant temperature sensor circuit. The full PDF is available in the DiagTechPro manuals library, and a free account is required to download.
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