This single-page diagnostic document addresses the CAT coolant level voltage high condition identified by fault code 0111-03 on Caterpillar heavy-duty diesel engines. It provides the troubleshooting procedure for a voltage-high signal from the coolant level sensor circuit, guiding technicians through inspection and resolution steps.
Official CAT coolant level voltage document details
| Brand | Caterpillar (CAT) |
| Model coverage | C11, C13, C15 (All Others) |
| System / Group | Diagnostic Trouble Codes (DTCs) |
| Publication no. | 0111-03 |
| Year / Revision | Unknown |
| Pages | 1 |
| File size | 0.3 MB |
| Format | PDF (compressed) |
| Language | English |
Document table of contents
- DTC 0111-03 — Coolant Level: Voltage Above Normal
- Conditions for setting the diagnostic code
- Circuit inspection and sensor signal verification
- Recommended corrective actions
Applicable truck models
This document applies to Caterpillar C11, C13, and C15 diesel engines grouped under the “All Others” classification. These engine platforms are widely installed in Class 8 on-highway trucks, vocational vehicles, and select off-highway equipment. Workshops servicing mixed CAT-powered fleets will encounter DTC 0111-03 when the coolant level sensor reports a voltage-high condition, typically indicating an open circuit or a faulty sensor. For official Caterpillar service information and parts lookup, visit Caterpillar Support.
Who needs this coolant level voltage manual
Fleet maintenance technicians and independent diesel mechanics diagnosing a voltage-high fault on the coolant level sensor circuit in CAT C11, C13, or C15 engines will benefit from this reference. Workshop owners can keep this one-page guide on hand for quick troubleshooting without navigating full-length service manuals.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download.
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