This MX CAN communication fault diagnostic manual covers fault code U0103, which indicates a CAN communication issue with low message rate from the transmission system (ETC2). Published by PACCAR for 2013 MX diesel engines compliant with EPA 2013 emissions standards, this 4-page technical document provides step-by-step troubleshooting procedures for mechanics and workshop technicians diagnosing CAN network communication failures.
Document details and specifications — MX CAN communication
| Brand | PACCAR |
| Model coverage | PACCAR MX engines (EPA 2013) |
| System/Group | DTCs / MX Engines (EPA 2013) |
| Publication number | Not listed |
| Year/Revision | 2013 |
| Pages | 4 |
| File size | 0.6 MB |
| Format | |
| Language | English |
Table of contents
- Fault code U0103 description and diagnostic condition
- Fault code information and readiness group classification
- Component description and location (CAN network communication)
- Set and reset conditions for the diagnostic trouble code
- Electrical diagrams
- Technical data and possible causes
- Diagnostic step-by-step troubleshooting procedure (Steps 1–4)
- Verification drive cycle validation method
Applies to these models
This MX CAN communication fault manual applies to 2013 PACCAR MX diesel engines equipped with EPA 2013 emissions control systems. The fault code U0103 relates to CAN network communication failures between the engine control module and transmission system, affecting vehicles that use DAVIE diagnostic software for fault retrieval and testing. For official PACCAR technical support and parts information, visit PACCAR official.
Who needs this CAN communication fault manual
Diesel mechanics, truck technicians, and workshop owners diagnosing PACCAR MX engine faults need this CAN communication fault guide. The document is essential for those troubleshooting code U0103 in EPA 2013-compliant vehicles, particularly when performing electrical diagnostics using DAVIE software and breakout harnesses.
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