This 2-page troubleshooting document is a CAT C15 coolant warning diagnostic guide covering DTC 0111-01 Low Coolant Level Warning (62) for C15 On-Highway Truck Engines (MXS configuration). It details the conditions that generate the code, the Engine Control Module (ECM) system response, and a step-by-step repair procedure for resolving low coolant level faults.
Official CAT C15 coolant warning document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (C15 On-Highway Truck MXS00001-UP) |
| System / Group | Cooling System — SMCS 1439-038-CLT |
| Publication no. | RENR5088-10 |
| Year / Revision | Published 01/02/2009, Updated 25/02/2009 |
| Pages | 2 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- 0111-01 Low Coolant Level Warning (62) — Overview
- Conditions Which Generate This Code
- System Response (ECM behavior, warning lamps, Caterpillar Electronic Technician status)
- Test Step 1: Check the Coolant Level
- Test Step 2: Check for Leaks in the Cooling System
Applicable truck models
This troubleshooting document applies to the Caterpillar C15 On-Highway Truck Engine in the MXS configuration (serial prefix MXS00001-UP). The C15 is a 15.2-liter inline six-cylinder diesel engine widely used in Class 8 highway trucks. The product line designation in the document is “Truck Engine,” and the DTC group also references NKS and RKS serial prefixes for other C15 variants. For official Caterpillar parts lookup, technical bulletins, and service information, visit Caterpillar Support and Service.
Who needs this CAT C15 coolant warning manual
Fleet mechanics, independent diesel technicians, and workshop owners servicing Caterpillar C15-powered trucks will find this document essential when diagnosing an active 0111-01 fault code. It is also valuable for anyone using Caterpillar Electronic Technician (ET) software who sees a “Low” and “DIAG” status next to Engine Coolant Level and needs the factory-specified diagnostic path.
The document explains that the ECM triggers this code when the coolant level sensor reads low for more than ten seconds, the sensor parameter is programmed to “4-pin” or “2-wire Float Sensor,” and the engine has been running for at least 30 seconds. The check engine lamp and warning lamp illuminate while the code is active; if a dedicated low coolant level lamp is installed, it activates instead of the warning lamp. Factory passwords are required to clear the code after repair. Test Step 1 directs the technician to verify the coolant level and confirm proper sensor installation. Test Step 2 covers inspecting for external leaks and checking for coolant contamination in the engine oil, with instructions to repair any leaks found and verify the fix.
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