Cummins ISX11.9 code 146 is the Cummins troubleshooting document for the Engine Coolant Temperature – Data Valid But Above Normal Operational Range – Moderately Severe Level fault (PID P110, SPN 110, FMI 0/16). The engine coolant temperature sensor is a variable-resistor sensor mounted on the thermostat housing, and the ECM uses the coolant temperature value for the engine protection system and emissions control. It sets an amber warning lamp and lists the exact conditions, causes, and step-by-step checks a technician follows.
Official document details
| Brand | Cummins |
|---|---|
| Model coverage | ISX11.9 CM2250, ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, and ISX15 CM2250 |
| System / Group | ISX11.9 CM2250 (2010-12) / DTCs |
| Fault identifiers | PID P110, SPN 110, FMI 0/16 |
| Warning lamp | Amber |
| Pages | 7 |
| Format | |
| Language | English |
Document table of contents
- Overview and circuit description
- Component location
- Conditions for running the diagnostics
- Conditions for setting the fault code
- Action taken when the fault code is active
- Conditions for clearing the fault code
- Shop Talk and possible causes
- Associated procedures and troubleshooting steps
Trucks covered by Cummins ISX11.9 code 146
This procedure applies to ISX11.9 CM2250, ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, and ISX15 CM2250. This is an official Cummins fault-code troubleshooting procedure, cleared and verified with the Cummins INSITE electronic service tool. It is set by a coolant temperature above 108 C (226 F) for more than 5 seconds, and typical effects include a power derate, disabled EGR valve operation, and possible engine shutdown if the Engine Protection Shutdown feature is enabled. For engine specifications and dealer support, see the official Cummins website.
Who needs this Cummins ISX11.9 code 146 manual
Heavy-truck technicians, fleet maintenance teams, and workshop owners diagnosing this fault use it to confirm the code before replacing parts. During diagnosis the fault indicates coolant temperature has exceeded the engine protection warning limit, and the repair is validated with the Cummins INSITE electronic service tool. The diagnostic runs continuously with the keyswitch in the ON position, and the repair is validated by returning the code to inactive status.
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