This document is a C15 coolant warning DTCs troubleshooting guide that covers diagnostic code 0111-14 (Low Coolant Level Warning) for the Caterpillar C15 on-highway truck engine. It provides step-by-step diagnostic procedures for identifying and resolving low coolant level conditions detected by the Engine Control Module (ECM).
Official C15 coolant warning DTCs document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (C15 On-Highway Truck MXS00001-UP) |
| System/Group | Cooling System — DTC 0111-14 (PID 0111 FMI 14, SMCS 1439-038-CLT) |
| Publication no. | RENR5088-10 |
| Year/Revision | Published 01/02/2009, Updated 25/02/2009 |
| Pages | 3 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- Conditions Which Generate This Code
- System Response
- Possible Performance Effect
- Troubleshooting — Test Step 1: Check the Coolant Level
- Troubleshooting — Test Step 2: Check for Leaks in the Cooling System
Applicable truck models
This C15 coolant warning DTCs procedure applies specifically to the Caterpillar C15 on-highway truck engine, configuration MXS00001-UP. The diagnostic code 0111-14 is triggered when the coolant level sensor — programmed to either “4 Pin” or “2-wire Float Sensor” — detects a low coolant condition during the first six hours of engine operation. The ECM displays “Low” and “DIAG” next to the “Engine Coolant Level” status in Caterpillar Electronic Technician (ET). Both the check engine lamp and the warning lamp illuminate while the code is active; if a dedicated low coolant level lamp is installed, it activates instead of the warning lamp. The troubleshooting sequence begins with verifying coolant level and sensor installation, then proceeds to inspecting for external leaks and checking for coolant contamination in the engine oil. No passwords are required to clear this diagnostic code. For additional Caterpillar technical resources, visit Caterpillar’s official support page.
Who needs this coolant warning DTCs manual
Diesel mechanics, fleet maintenance technicians, and workshop owners servicing Caterpillar C15 on-highway engines will find this guide essential when diagnosing a 0111-14 low coolant level warning. It is particularly relevant during initial engine commissioning or after cooling system service work.
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