This Cummins fault code 145 document is an 8-page troubleshooting PDF for the Engine Coolant Temperature 1 Sensor Circuit on ISB6.7 CM2350 engines. It explains the low-voltage or short-to-low-source fault, the lamp response, clearing conditions, and the diagnostic path used with a service tool.
Official Cummins fault code 145 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2350, 2013-17 |
| System/Group | DTCs; Engine Coolant Temperature 1 Sensor Circuit |
| Publication no. | Not shown in the extract |
| Year/Revision | Unknown; copyright 2017 shown in file extract |
| Pages | 8 |
| File size | 0.4 MB |
| Format | |
| Language | English |
Document table of contents
- Fault Code: 145
- PID: P110
- SPN: 110
- FMI: 4/4
- Lamp: Amber
- Engine Coolant Temperature 1 Sensor Circuit – Voltage Below Normal or Shorted to Low Source
- Circuit Description
- Component Location
- Reasons
- Effect
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Troubleshooting Steps
- Step 1A) Check for an inactive fault code.
- Step 2A) Inspect the engine coolant temperature sensor and connector pins.
- Step 2B) Check the circuit response.
- Step 2C) Check the fault codes and verify sensor condition.
- Step 3A) Inspect the ECM and engine harness connector pins.
- Step 3B) Check the ECM response.
- Step 3C) Check for a pin-to-pin short circuit in the engine harness.
- Step 3D) Check for a pin-to-ground short circuit.
- Step 3E) Check for an inactive fault code.
- Step 4A) Check if an ECM calibration update is available.
- Step 4B) Disable the fault code.
Applicable truck models
This file applies to Cummins ISB6.7 CM2350 engines in the 2013-17 coverage group. The extract identifies the engine coolant temperature sensor on the thermostat housing and describes ECM monitoring of the 5-volt signal circuit, but it does not list specific truck makes or chassis models. For manufacturer information, visit the official Cummins website.
Who needs this Cummins fault code 145 manual
This manual is for mechanics, diagnostic technicians, and workshop owners diagnosing an active or intermittent coolant temperature sensor circuit fault. It is useful when the fan stays on, the amber CHECK ENGINE lamp or MIL is illuminated, or a diagnostic tool reports low signal voltage below 0.5 VDC for more than 1 second.
The procedures cover connector inspection, sensor response checks, ECM connector inspection, pin-to-pin short testing, pin-to-ground short testing, calibration revision review, and fault clearing validation. The troubleshooting also notes that shared return wires in the engine harness can set multiple fault codes, so technicians should check for other active faults before starting Cummins fault code 145 diagnostics.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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