This document is a PACCAR U1785A CAN message diagnostic trouble code reference for MX Europe engines compliant with EPA 2004 emissions standards. Published by PACCAR via their Rapido technical portal, it provides mechanics and workshop technicians with complete diagnostic procedures, set conditions, and repair verification steps for DTC U1785A.
The U1785A code addresses CAN (Controller Area Network) communication failures in PACCAR MX-series diesel engines used in European heavy trucks.
Document details and specifications — PACCAR U1785A CAN
| Brand | PACCAR |
| Model coverage | MX Europe engines (EPA 2004) |
| System/Group | DTCs / MX Europe Engines |
| Publication number | M033451 |
| Year/Revision | 18 August 2017 |
| Pages | 2 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Table of contents
- Set conditions
- Diagnostic condition
- Corresponding OBD readiness monitor
- Reset condition
- Repair verification
- Possible cause
- Additional information
Applies to these models
This PACCAR U1785A CAN message code reference applies exclusively to PACCAR MX-series engines meeting EPA 2004 emissions standards (MX_EPA04 and MX_EPA13 variants). The diagnostic is valid only for the specific chassis number and engine configuration documented at the time of publication. For current applicability, consult PACCAR’s official technical portal. PACCAR Dealernet technical portal
Who needs this U1785A CAN message manual
Heavy truck mechanics, workshop technicians, and fleet diagnostic specialists working on PACCAR MX-series engines require this U1785A CAN message guide to accurately diagnose and resolve CAN communication errors. The structured repair verification procedure ensures systematic troubleshooting of wiring, component defects, and software configuration issues.
The complete U1785A CAN message diagnostic procedure in PDF format is available in the DiagTechPro manuals library. A free account is required to download the full 2-page technical document.
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Using this document effectively
Use PACCAR U1785A CAN message diagnostic code — MX Europe EPA 2004 as a reference alongside the exact machine identification, engine family, control module, and publication revision shown on the equipment. Confirm that the model and production range match before following any table, connector view, test sequence, or specification. Record the original fault code and operating conditions before clearing codes or disconnecting components.
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