The PACCAR MX P0703 diagnostic is a communication fault documented in the 2013 PACCAR MX Diagnostic Service Manual, covering CAN network message issues related to the EBC1 brake system module. This technical reference is published by PACCAR for mechanics and service technicians diagnosing EPA 2013–compliant heavy-duty truck engines. The document provides step-by-step diagnostic procedures, electrical schematics, and repair verification protocols specific to this fault condition.
P0703 is classified as a CAN communication issue rather than a component-specific failure, meaning the fault relates to data transmission between control units rather than a single sensor or ECU malfunction. The diagnostic runs continuously when ignition is on and requires 3 drive cycles to recover once the error is resolved.
Document details and specifications — PACCAR MX P0703
| Brand | PACCAR |
| Model coverage | MX Engines (EPA 2013) |
| System/Group | DTCs / MX Engines |
| Year/Revision | 2013 |
| Pages | 4 |
| File size | 0.6 MB |
| Format | |
| Language | English |
Table of contents
- P0703 fault code description and information
- Diagnostic condition and set/reset parameters
- Component location and electrical diagrams
- Possible causes and technical data
- Step-by-step diagnostic procedure (Steps 0703a–0703d)
- Visual inspection protocol
- Data check and component repair guidance
- Engine Support Call Center contact information
- Verification drive cycle procedure
Applies to these models
This PACCAR MX P0703 diagnostic manual applies to PACCAR MX series heavy-duty diesel engines manufactured under EPA 2013 emissions standards. It addresses CAN bus communication failures between the cabin ECU and EBS brake system modules. Technicians should consult the cabin ECU for related fault codes when diagnosing this PACCAR MX P0703 condition. PACCAR official website
Who needs this PACCAR MX P0703 diagnostic manual
Heavy-duty truck mechanics, diesel engine service technicians, and workshop owners diagnosing CAN communication faults on PACCAR MX–powered trucks require this reference. The MX P0703 diagnostic manual is essential for technicians performing electrical troubleshooting and brake system diagnostics on EPA 2013 compliant engines.
The complete MX P0703 diagnostic manual is available in the DiagTechPro manuals library. A free account is required to download the full PDF document.
Related manuals library
