This 18-page coolant level DTCs troubleshooting document provides the official Caterpillar diagnostic procedure for fault code 0111-03 (Coolant Level Voltage High). It covers the complete sensor circuit test sequence for C15 on-highway truck engines with MXS, NKS, or RKS configurations, guiding technicians from initial code verification through supply voltage checks, connector inspections, and ECM validation.
Official coolant level DTCs troubleshooting document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (MXS00001-UP) |
| System / Group | Engine Coolant Level Sensor Circuit — SMCS 1439-038-CLT |
| Publication no. | RENR5088-10 |
| Year / Revision | Published 01/02/2009, updated 25/02/2009 |
| Pages | 18 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- 0111-03 Coolant Level Voltage High (12) — Conditions Which Generate This Code
- System Response and ECM Default Behavior
- Coolant Level Sensor Circuit — Test (System Operation Description)
- 4-Pin Sensor Wiring and Terminal Identification (P1-2, P1-54, P1-49, P1-5)
- 2-Wire Float Sensor Wiring and Terminal Identification (P1-26, P1-5)
- Test Step 1: Check for Active Diagnostic Codes (111-2, 111-3, 111-4)
- Test Step 4: Check the Supply Voltage at the Sensor (4.5–5.5 VDC)
- Test Step 5: Create a Short at the Sensor Connector
- Test Step 7: Check for Proper Operation of the ECM
- Test Step 9: ECM Connector and Harness Inspection (45 N Pull Test)
- Test Step 11: Check for the Correct Voltage at the ECM Connector
- Test Step 12: ECM Replacement Procedure
Applicable truck models
This document applies to Caterpillar C15 on-highway truck engines in the MXS configuration (serial numbers MXS00001 and up). The file header also references NKS and RKS configurations within the C15 DTC group. The coolant level sensor and its wiring harness are OEM-installed, so procedures involve coordination with the vehicle manufacturer’s connector and harness layout. The document references Caterpillar Electronic Technician (Cat ET) software for diagnostics, including reading active codes and verifying sensor status. Two sensor types are addressed: the 4-pin sensor with terminals at P1-2, P1-54, P1-49, and P1-5, and the 2-wire float sensor using terminals P1-26 and P1-5. For additional product support and software updates, visit the Caterpillar official support page.
Who needs this coolant level DTCs troubleshooting manual
Heavy-duty truck mechanics and workshop owners diagnosing a persistent 0111-03 diagnostic code on C15 engines will find every required test step, expected voltage range, and repair decision tree in this document. It is also essential for technicians verifying the “Coolant Level Sensor” programmable parameter setting or performing ECM swap tests.
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