This is the PACCAR MX P1024 fault diagnostic and troubleshooting manual, a comprehensive 8-page technical reference for identifying and repairing back pressure valve actuator power supply faults in 2013 PACCAR MX engines certified for EPA 2013 emissions standards. Published by PACCAR as part of their official 2013 MX Diagnostic Service Manual, this document equips technicians with electrical diagrams, wiring check procedures, and systematic diagnostic steps to resolve actuator power supply failures.
The PACCAR MX P1024 fault is triggered when the BPV actuator detects an incorrect power supply voltage—either below 7.5 volts or above 35 volts. This diagnostic runs continuously whenever the ignition is keyed on and sets a 1-trip MIL (malfunction indicator lamp) with a 3 drive cycle recovery window. Understanding the PACCAR MX P1024 condition is essential because the back pressure valve controls exhaust gas flow, heat generation in the EAS (Emissions Aftertreatment System), turbo boost pressure, and engine braking functions.
Document details and specifications — PACCAR MX P1024
| Brand | PACCAR |
| Model coverage | MX Engines (2013) |
| System/Group | DTCs / MX Engines (EPA 2013) |
| Publication number | P1024 |
| Year/Revision | 2013 |
| Pages | 8 |
| File size | 0.5 MB |
| Format | |
| Language | English |
Table of contents
- Fault code description and diagnostic information
- Component description – BPV actuator (L096) and internal components
- Control strategy and fail-safe operation
- Diagnostic condition and set/reset criteria
- Electrical diagrams and pin assignments
- Technical data and component checks
- Wiring check procedures with measurement values
- Possible causes and additional information
- Diagnostic step-by-step troubleshooting tree
- Verification and repair cycles
Applies to these models
This PACCAR MX P1024 manual covers back pressure valve actuator diagnostics on 2013 PACCAR MX series diesel engines with EPA 2013 emissions aftertreatment systems. The BPV actuator (part L096) communicates via E-CAN with the PCI ECU and is a smart actuator with integrated diagnostics for power supply voltage, motor position, current draw, output shaft position, and ECU temperature. Consult the PACCAR official website for engine specifications and related service bulletins.
Who needs this PACCAR MX P1024 diagnostic manual
Diesel mechanics and workshop owners servicing PACCAR MX engines need the PACCAR MX P1024 manual to diagnose and resolve back pressure valve actuator power supply faults efficiently. This guide provides the exact wiring check values, electrical diagrams, and troubleshooting steps required to differentiate between vehicle power system failures and actuator malfunctions, enabling faster repairs and reduced diagnostic labor time.
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