This document is a CAT 0111-02 coolant level troubleshooting guide covering fault code 0111-02 (Coolant Level signal invalid) for Caterpillar 3406E, C-10, and C-12 on-highway truck engines. It describes the conditions that generate the diagnostic trouble code, the ECM system response, and the required test procedure to resolve the fault.
Official CAT 0111-02 coolant level document details
| Brand | Caterpillar (CAT) |
| Model coverage | 3406E, C-10, C-12 Truck Engines (8YS, 9NS, 5DS, 1LW prefixes) |
| System/Group | Diagnostic Trouble Codes — SMCS 5574-038-CLT |
| Publication no. | RENR1328-08 |
| Year/Revision | Published 01/10/2008, Updated 16/10/2008 |
| Pages | 1 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- 0111-02 Coolant Level signal invalid (12) — Fault code overview
- Conditions Which Generate This Code — ECM detection criteria
- System Response — ECM default behavior and electronic service tool display
- Test Step 1: Coolant Level Sensor Circuit — Test and results
Applicable truck models
This troubleshooting document 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 procedure also covers engine serial prefix groups 8YS, 5DS, and 1LW. These engines are commonly installed in Class 8 heavy-duty trucks used for long-haul and vocational applications. For additional product support and parts information, visit Caterpillar’s official support page.
Who needs this CAT 0111-02 coolant level manual
Diesel mechanics and workshop owners diagnosing a coolant level sensor fault on 3406E, C-10, or C-12 engines need this document. It is essential for anyone who sees DTC 0111-02 logged on an electronic service tool and needs the factory-prescribed sensor circuit test procedure.
According to the document, the ECM generates fault code 0111-02 when the coolant level sensor sends an invalid signal for more than ten seconds and the “Coolant Level Sensor” parameter is programmed to “Yes.” When the code is active, the ECM defaults the engine coolant level status to OK, and the electronic service tool displays “DIAG” next to the “Engine Coolant Level” status. The single test step directs the technician to perform the Coolant Level Sensor Circuit test; if the result is OK, no further action is required.
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