This single-page CAT C13 throttle position diagnostic document covers DTC 0091-13 (Throttle Position Out of Calibration) for Caterpillar heavy-duty diesel engines. It provides the fault code definition, conditions for activation, and the recommended troubleshooting steps to restore correct throttle sensor calibration.
Official CAT C13 throttle position document details
| Brand | Caterpillar (CAT) |
| Model coverage | C11, C13, C15 diesel engines |
| System / Group | Diagnostic Trouble Codes (DTCs) — Throttle Position Sensor |
| Publication no. | Not specified |
| Year / Revision | Unknown |
| Pages | 1 |
| File size | 0.3 MB |
| Format | PDF (compressed) |
| Language | English |
Document table of contents
- DTC 0091-13 — Throttle Position Out of Calibration
- Conditions for code activation
- Throttle position sensor inspection
- Calibration verification and adjustment procedure
- Expected sensor voltage ranges
- Clearing the diagnostic trouble code
Applicable truck models
This document applies to Caterpillar C11, C13, and C15 diesel engines used across a wide range of on-highway Class 8 trucks and vocational vehicles. These engine platforms are commonly found in models from manufacturers such as Peterbilt, Kenworth, and Western Star. The DTC 0091-13 fault relates specifically to the throttle position sensor circuit and its calibration state within the electronic control module (ECM). Technicians working on any chassis equipped with these CAT engine families should reference this material when the out-of-calibration code is logged. For additional technical resources and service bulletins, visit Caterpillar’s official support page.
Who needs this C13 throttle position manual
Diesel technicians and workshop owners diagnosing drivability complaints or check-engine lights on Caterpillar-powered trucks will find this document essential. It is particularly useful when Cat Electronic Technician (Cat ET) reports DTC 0091-13, indicating the throttle position sensor signal is outside its expected calibration window.
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