This 1-page diagnostic guide addresses the CAT C13 speed sensor DTC 0064-08, covering the Secondary Engine Speed Loss of Signal fault on Caterpillar heavy-duty diesel engines. It provides technicians with the troubleshooting steps and circuit checks needed to resolve this specific diagnostic trouble code.
Official CAT C13 speed sensor DTC document details
| Brand | Caterpillar (CAT) |
| Model coverage | C11, C13, C15 (All Others) |
| System / Group | DTCs — Diagnostic Trouble Codes |
| Publication no. | 0064-08 |
| Year / Revision | Unknown |
| Pages | 1 |
| File size | 0.4 MB |
| Format | |
| Language | English |
Document table of contents
- DTC 0064-08 — Secondary Engine Speed Loss of Signal
- Conditions for setting the fault code
- Circuit and connector inspection procedures
- Secondary engine speed sensor testing
- Recommended repair actions and verification
Applicable truck models
This document applies to Caterpillar C11, C13, and C15 diesel engines grouped under the “All Others” classification. These engines are widely installed in Class 8 on-highway trucks from manufacturers such as Peterbilt, Kenworth, and Freightliner, as well as various vocational and off-highway applications. The secondary engine speed sensor is a critical input for the Electronic Control Module (ECM), and loss of its signal can affect engine timing, power delivery, and overall drivability. Workshops servicing any CAT-powered truck equipped with a C11, C13, or C15 engine should keep this bulletin accessible. For additional technical resources and parts information, visit the Caterpillar official support page.
Who needs this C13 speed sensor DTC manual
Diesel mechanics, fleet maintenance technicians, and independent workshop owners diagnosing a C13 speed sensor DTC will find this guide essential. It is particularly useful when a truck’s ECM logs fault code 0064-08 and the technician needs a structured, manufacturer-referenced procedure to isolate the secondary engine speed sensor circuit fault quickly.
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