This CAT 0111-11 coolant level troubleshooting document provides the official diagnostic procedure for fault code 0111-11 (Very Low Coolant Level, FMI 62) on Caterpillar 3406E, C-10, and C-12 on-highway truck engines. It details the conditions that generate the code, the ECM system response, and a two-step test sequence for resolving the issue.
Official CAT 0111-11 coolant level document details
| Brand | Caterpillar (CAT) |
| Model coverage | 3406E, C-10, C-12 Truck Engines (8YS, 9NS, 5DS, 1LW prefixes) |
| System/Group | Cooling System — Diagnostic Trouble Codes (SMCS 5574-038-CLT) |
| Publication no. | RENR1328-08 |
| Year/Revision | Published 01/10/2008, Updated 16/10/2008 |
| Pages | 2 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- 0111-11 Very Low Coolant Level (62) — Conditions Which Generate This Code
- System Response (derate, speed limit, engine monitoring/shutdown behavior)
- Test Step 1: Check the Coolant Level
- Test Step 2: Check for Leaks in the Cooling System
Applicable truck models
This procedure applies to Caterpillar on-highway truck engines in the 3406E, C-10, and C-12 families. The specific configuration referenced is the C-12 Truck Engine 9NS00001-UP, but the document also covers serial-number prefixes 8YS, 5DS, and 1LW. These engines are found in Class 8 trucks from multiple OEMs. The “Coolant Level Sensor” parameter must be programmed to “Yes” in the ECM for this code to be active. For official product support and parts information, visit Caterpillar Support.
Who needs this CAT 0111-11 coolant level manual
Fleet mechanics and independent workshop technicians servicing Caterpillar-powered trucks will need this document when the check engine lamp illuminates for fault code 0111-11. It is essential for anyone diagnosing a 35-percent power derate and a 72 km/h (45 mph) speed limitation caused by very low coolant level detection.
The Engine Control Module logs this diagnostic code and triggers a snapshot when the coolant level remains very low for more than 30 seconds. If “Engine Monitoring” is programmed to Shutdown, the engine will shut down 30 seconds after the code becomes active. Factory passwords are required to clear this code from the ECM, so technicians must have access to Caterpillar Electronic Technician (Cat ET) with appropriate authorization.
Test Step 1 instructs the technician to verify the physical coolant level. If the level is normal, the coolant level sensor installation must be inspected. If the level is low, coolant is added and the procedure advances to Test Step 2. Test Step 2 checks for external coolant leaks and for coolant contamination in the engine oil. When no leaks are found, the engine is run to operating temperature, cooled, and the level is rechecked. When leaks or oil contamination are confirmed, repairs are performed and verified.
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