The MX EPA 2013 U1579 diagnostic code manual is a technical service document published by PACCAR for truck mechanics and workshop technicians. This 5-page guide covers the U1579 fault code, which relates to BPV actuator position data that is erratic, intermittent, or incorrect on PACCAR MX engines built to EPA 2013 emission standards. The manual provides step-by-step diagnostic procedures, electrical diagrams, and troubleshooting guidance for resolving this communication-related diagnostic trouble code.
Document details and specifications — MX EPA 2013
| Brand | PACCAR |
| Model coverage | PACCAR MX Engines (EPA 2013) |
| System/Group | DTCs / MX Engines |
| Publication number | Not specified |
| Year/Revision | 2013 |
| Pages | 5 |
| File size | 0.4 MB |
| Format | |
| Language | English |
Table of contents
- Code U1579 – Fault code number and description
- Fault code information – MIL activation and recovery cycles
- Description of components and communication issue details
- Diagnostic conditions and set/reset conditions
- Electrical diagrams
- Technical data overview
- Possible causes: E-CAN communication and faulty BPV actuator
- Additional information on BPV actuator smart electronics
- Diagnostic step-by-step procedures (Steps 1–4)
- Visual inspection and data check protocols
- Component repair or replacement guidance
- Engine Support Call Center contact information
- Verification drive cycle validation procedure
Applies to these models
The MX EPA 2013 U1579 diagnostic code manual applies to PACCAR MX diesel engines manufactured to EPA 2013 emission standards. It covers the BPV (backpressure valve) actuator communication system controlled via E-CAN by the PCI ECU (D420). This document is essential for technicians working on light-, medium-, and heavy-duty trucks equipped with PACCAR MX powerplants that display U1579 fault codes. For official PACCAR engine specifications and service resources, visit the PACCAR official website.
Who needs this MX EPA 2013 U1579 manual
Diesel truck mechanics, fleet maintenance technicians, and workshop owners requiring authoritative diagnostic guidance on the EPA 2013 U1579 code will benefit from this service manual. The step-by-step troubleshooting procedures address both electrical harness inspection and smart actuator diagnostics, making it indispensable for shops servicing PACCAR-equipped trucks.
The complete EPA 2013 U1579 diagnostic service manual is available in the DiagTechPro manuals library. A free account is required to download the full PDF and access additional PACCAR service documentation.
Related manuals library
