CAT C11 C13 diagnostic identifies this official workshop document.
This CAT C11 C13 C15 diagnostic codes chart is a 5-page PDF reference listing diagnostic trouble codes (DTCs) applicable to Caterpillar C11, C13, and C15 engines. It serves as a quick-lookup resource for identifying fault codes during engine troubleshooting and repair.
Official CAT C11 C13 C15 diagnostic codes chart document details
| Brand | Caterpillar (CAT) |
| Model coverage | C11, C13, C15 (All Others) |
| System / Group | DTCs — Diagnostic Trouble Codes |
| Publication no. | Not specified |
| Year / Revision | Unknown |
| Pages | 5 |
| File size | 0.5 MB |
| Format | |
| Language | English |
Document table of contents
- Page 1 — Diagnostic codes listing (opening section)
- Page 2 — Continued DTC definitions
- Page 3 — Additional fault code entries
- Page 4 — Extended code descriptions
- Page 5 — Final code entries and reference notes
Applicable truck models
This chart applies to vehicles and equipment powered by Caterpillar C11, C13, and C15 diesel engines classified under the “All Others” grouping. These engine families are widely used in on-highway Class 8 trucks, vocational trucks, and select off-highway applications. The C11 and C13 serve medium- to heavy-duty platforms, while the C15 is one of Caterpillar’s most recognized heavy-duty truck engines. Mechanics working on any chassis equipped with these powertrains — including Peterbilt, Kenworth, and Western Star models that offered CAT engine options — will find this DTC chart relevant. For official engine specifications and current parts support, visit Caterpillar Support.
Who needs this CAT C11 C13 C15 diagnostic codes chart manual
Fleet maintenance technicians, independent diesel mechanics, and workshop owners who service Caterpillar-powered trucks need this reference when reading fault codes with a diagnostic scan tool. It provides a structured list of DTCs so technicians can quickly identify the affected system, confirm the code description, and proceed with the correct repair path.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download.
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