This 19-page CAT C15 111-11 troubleshooting document provides step-by-step diagnostic procedures for resolving very low coolant level fault code 0111-11 and related sensor circuit issues on Caterpillar C15 on-highway truck engines (MXS configuration). It details ECM responses, derate conditions, sensor wiring schematics, and voltage verification tests for both 4-pin and 2-wire float coolant level sensors.
Official CAT C15 111-11 troubleshooting document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (MXS00001-UP) |
| System/Group | Cooling System — Coolant Level Sensor Circuit (SMCS 1439-038-CLT) |
| Publication no. | RENR5088-10 |
| Year/Revision | Published 01/02/2009, updated 25/02/2009 |
| Pages | 19 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- 0111-11 Very Low Coolant Level (62) — Conditions, system response, and derate description
- Test Step 1: Check the Coolant Level
- Test Step 2: Check for Leaks in the Cooling System
- Coolant Level Sensor Circuit — Test (covers DTC 111-2, 111-3, 111-4)
- System Operation Description — 4-pin sensor and 2-wire float sensor types
- Engine Monitoring Lamps parameter configuration (P1-29, P1-30 terminals)
- 4-Pin Sensor wiring and terminal locations (P1-2, P1-5, P1-49, P1-54)
- Electrical connector inspection and 45 N pull test
- Voltage verification at ECM connector (4.5–5.5 VDC)
- 2-Wire Float Sensor schematic and terminal locations (P1-5, P1-26)
- Diagnostic code generation test using jumper wires
- ECM replacement procedure when sensor and harness are confirmed operational
Applicable truck models
This document applies to the Caterpillar C15 On-Highway Truck Engine, configuration MXS00001-UP. The procedures address the Engine Control Module (ECM) and its interaction with OEM-installed coolant level sensors. Workshops servicing Class 8 trucks equipped with C15 MXS, NKS, or RKS engines will find these diagnostics relevant. When the ECM detects a very low coolant level for more than 30 seconds, it derates engine power by 35 percent and limits vehicle speed to 72 km/h (45 mph). If Engine Monitoring is programmed to Shutdown, the engine shuts down after 30 seconds of active fault. Factory passwords are required to clear the diagnostic code. For official Caterpillar parts and service resources, visit Caterpillar’s official website.
Who needs this CAT C15 111-11 troubleshooting manual
Diesel mechanics, fleet maintenance technicians, and workshop owners working on CAT C15-powered trucks need this manual to diagnose coolant level sensor faults, verify ECM connector wiring integrity, and restore full engine power after derate events. Caterpillar Electronic Technician (Cat ET) software is required to execute several test steps described in this document.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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