This document is the PACCAR MX Engine P1023 diagnostic service manual, a technical resource for diagnosing back pressure valve actuator temperature faults on 2013 EPA-compliant PACCAR MX engines. Published by PACCAR, Inc., this 8-page guide provides mechanics and workshop technicians with step-by-step troubleshooting procedures, electrical diagrams, and component specifications for fault code P1023 (BPV actuator temperature—data valid but too high).
The manual covers the complete architecture of the BPV actuator system, including the electromotor, output shaft position sensor, and integrated temperature sensor monitoring the ECU printed circuit board. Understanding the PACCAR MX Engine P1023 is essential for identifying whether the fault originates from a malfunctioning cooling system, blocked coolant pipes, or a defective actuator unit.
Document details and specifications — PACCAR MX Engine
| Brand | PACCAR |
| Model coverage | MX Engines (EPA 2013) |
| System/Group | DTCs / MX Engines |
| Publication number | P1023 |
| Year/Revision | 2013 |
| Pages | 8 |
| File size | 0.6 MB |
| Format | |
| Language | English |
Table of contents
- Fault code description and information
- Description of components (BPV actuator L096, electromotor, output shaft, position sensors)
- Control system overview and E-CAN communication
- Unpowered and fail-safe position operation
- System effects and engine functions
- Diagnostic conditions and set/reset criteria
- Electrical diagram and connector pinouts (D420 PCI ECU to L096 BPV valve)
- Technical data and component check procedures
- Wiring check specifications
- Possible causes and additional information
- Diagnostic step-by-step troubleshooting tree
- Verification and drive cycle procedures
Applies to these models
This PACCAR MX Engine P1023 manual applies to PACCAR MX diesel engines compliant with EPA 2013 emissions standards. The troubleshooting procedures and technical specifications cover the back pressure valve (BPV) actuator assembly (component L096) and its integration with the PCI ECU via E-CAN bus communication. The diagnostic procedures are specific to identifying temperature sensor faults, cooling system failures, and defective actuator electronics on MX-powered heavy-duty trucks. For additional technical resources and engine specifications, visit the PACCAR official website.
Who needs this PACCAR MX Engine P1023 manual
Heavy-duty truck mechanics, diesel engine technicians, and workshop service managers require this guide when diagnosing and resolving active fault code P1023 on PACCAR MX-powered vehicles. The MX Engine P1023 manual is indispensable for systematically checking coolant levels, inspecting actuator cooling circuits, performing wiring tests, and determining whether component replacement is necessary before contacting PACCAR Engine Support.
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