This single-page diagnostic document is a CAT throttle position DTC reference covering fault code 0091-08 (Throttle Position Invalid) for Caterpillar heavy-duty diesel engines. It provides the conditions for generating the code, expected system responses, and recommended troubleshooting steps for technicians working on affected equipment.
Official CAT throttle position DTC document details
| Brand | Caterpillar (CAT) |
| Model coverage | C11, C13, C15 engines (All Others) |
| System / Group | Diagnostic Trouble Codes (DTCs) |
| Publication no. | 0091-08 |
| Year / Revision | Unknown |
| Pages | 1 |
| File size | 0.3 MB |
| Format | PDF (compressed) |
| Language | English |
Document table of contents
- DTC 0091-08 — Throttle Position Invalid
- Conditions for generating the diagnostic code
- System response and engine derate behavior
- Recommended troubleshooting and inspection steps
Applicable truck models
This guide applies to Caterpillar C11, C13, and C15 diesel engines classified under the “All Others” group. These powertrains are widely installed in on-highway Class 8 trucks, vocational vehicles, and select off-highway applications. The throttle position DTC information here is relevant to any chassis equipped with these engine platforms where fault code 0091-08 is logged. Technicians should verify the specific engine serial number prefix to confirm applicability. For additional product support literature and serial number lookup, visit Caterpillar’s official support page.
Who needs this throttle position DTC manual
Fleet mechanics, independent diesel technicians, and workshop owners diagnosing a Throttle Position Invalid fault on CAT C11, C13, or C15 engines will benefit from this document. It serves as a quick-reference sheet for understanding code 0091-08 trigger conditions and clearing the fault after repairs are completed.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download.
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