PACCAR MX U1816 diagnostic identifies this official workshop document.
This document is the official 2013 PACCAR MX diagnostic service manual entry for trouble code U1816, a CAN communication fault related to the EBC2 brake system message. Published by PACCAR for service technicians, it provides step-by-step diagnostic procedures, electrical diagrams, and repair guidance for resolving this network communication issue on PACCAR MX-series engines meeting EPA 2013 emissions standards.
The U1816 code indicates that the relative speed signal from the right front wheel brake system has fallen out of acceptable range on the controller area network (CAN). This is a communication-related diagnostic trouble code rather than a component-specific fault, meaning the issue lies in data transmission between the transmission ECU and brake system modules.
Document details and specifications — PACCAR MX U1816
| Brand | PACCAR |
| Model coverage | PACCAR MX Engines |
| System/Group | DTCs / MX Engines (EPA 2013) |
| Year/Revision | 2013 |
| Pages | 4 |
| File size | 0.6 MB |
| Format | |
| Language | English |
Table of contents
- Fault code description and DTC information
- Component description and location
- Diagnostic conditions and set/reset criteria
- Electrical diagrams
- Technical data and possible causes
- Step-by-step diagnostic procedure (Steps 1–4)
- Verification drive cycle instructions
Applies to these models
This PACCAR MX U1816 diagnostic manual applies to PACCAR MX-series engines equipped with EBC2 electronic brake control systems manufactured for EPA 2013 compliance. It covers diagnostic troubleshooting for CAN network communication faults affecting front axle right wheel brake speed signals. For complete engine and vehicle specifications, consult PACCAR’s official website.
Who needs this MX U1816 diagnostic manual
Heavy-duty truck mechanics and workshop owners diagnosing brake system communication faults on PACCAR MX engines will rely on this MX U1816 diagnostic reference. Service technicians troubleshooting CAN network issues, transmission ECU faults, or brake system electrical problems require this manual for accurate fault isolation and repair procedures.
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