This 1-page PDF is a CAT C15 coolant level DTC reference document covering fault code 0111-02, “Coolant Level Signal Invalid,” for Caterpillar C11, C13, and C15 diesel engines. It provides the diagnostic trouble code definition, conditions for triggering the fault, and the recommended troubleshooting steps for resolving an invalid coolant level sensor signal.
Official CAT C15 coolant level DTC document details
| Brand | Caterpillar (CAT) |
| Model coverage | C11, C13, C15 (All Others) |
| System / Group | Diagnostic Trouble Codes (DTCs) |
| Publication no. | 0111-02 |
| Year / Revision | Unknown |
| Pages | 1 |
| File size | 0.3 MB |
| Format | PDF (compressed) |
| Language | English |
Document table of contents
- Fault Code 0111-02 — Coolant Level Signal Invalid
- Conditions for setting the DTC
- Diagnostic and troubleshooting procedure
- Coolant level sensor circuit inspection
Applicable truck models
This document applies to vehicles and equipment powered by Caterpillar C11, C13, and C15 diesel engines classified under the “All Others” group. These engines are widely used in Class 8 on-highway trucks, vocational trucks, and select off-highway applications. The fault code 0111-02 addresses an invalid signal from the coolant level sensor, a condition that can appear across multiple chassis platforms sharing these powertrains. For official Caterpillar parts lookup and additional service literature, visit Caterpillar Support and Service Resources.
Who needs this C15 coolant level DTC manual
Fleet mechanics, independent diesel technicians, and workshop owners servicing Caterpillar-powered trucks will find this reference essential when diagnosing a coolant level signal invalid fault. It is particularly useful for anyone performing electrical troubleshooting on the coolant level sensor circuit of C11, C13, or C15 engines.
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