This document is a fault code 146 DTCs troubleshooting sheet for the ISB6.7 CM2350 engine DTC related to high engine coolant temperature. It explains the circuit description, component location, fault reason, engine effect, diagnostic conditions, clearing conditions, and step-by-step checks. The file is intended for diagnostic tool use alongside the applicable Cummins engine service manual.
Official fault code 146 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2350, 2013-17 |
| System/Group | DTCs; engine coolant temperature |
| Publication no. | Not specified in extract |
| Year/Revision | Unknown; copyright © 2017 shown in file extract |
| Pages | 4 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE: 146
- PID: P110
- SPN: 110
- FMI: 0/16
- LAMP: AMBER
- ENGINE COOLANT TEMPERATURE – DATA VALID BUT ABOVE NORMAL OPERATIONAL RANGE – MODERATELY SEVERE LEVEL
- CIRCUIT DESCRIPTION
- COMPONENT LOCATION
- REASON
- 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) Monitor coolant temperature reading.
- Step 2A) Check if an ECM calibration update is available.
- Step 2B) Disable the fault code.
Applicable truck models
This PDF applies to Cummins ISB6.7 CM2350 engines in the 2013-17 group shown in the file information. The extract identifies the engine coolant temperature sensor on the thermostat housing and covers DTC handling when the ECM detects coolant temperature greater than 108°C [226°F] for more than 5 seconds. For brand information, visit the Cummins official website.
Who needs this fault code 146 DTCs manual
Workshop owners, diesel mechanics, and fleet technicians need this fault code 146 DTCs manual when an amber CHECK ENGINE lamp appears with SPN 110, PID P110, and FMI 0/16. It helps confirm whether the diagnostic tool coolant temperature value correlates with a mechanical gauge or known value before replacing the coolant temperature sensor or checking ECM calibration revision history.
The procedure states that the ECM supplies 5 volts to the coolant temperature signal circuit and monitors voltage changes caused by sensor resistance. When active, the ECM illuminates the amber CHECK ENGINE lamp immediately and reduces engine torque output. The effect section also notes progressive power and/or speed derate, with shutdown possible if the Engine Protection Shutdown feature is enabled. Clearing guidance includes performing a key cycle, starting the engine, idling for 1 minute, and using the diagnostic tool Reset All Faults command where applicable.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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