This document is the PACCAR MX P3796 DPF diagnostic service manual for 2013 PACCAR MX engines under EPA 2013 emissions standards. Published by PACCAR, it provides mechanics and workshop technicians with complete fault identification, set conditions, reset procedures, and step-by-step troubleshooting for DPF soot level code P3796.
The manual covers the “Diesel particulate filter (DPF) – Soot level most severe” fault, which triggers a MIL lamp and red fault lamp after one trip, requiring three drive cycles for recovery.
Document details and specifications — PACCAR MX P3796
| Brand | PACCAR |
| Model coverage | MX Engines (2013) |
| System/Group | DTCs / MX Engines (EPA2013) |
| Publication no. | P3796 |
| Year/Revision | 2013 |
| Pages | 3 |
| File size | 0.4 MB |
| Format | |
| Language | English |
Table of contents
- Fault code description and information
- Diagnostic condition and set/reset conditions
- Possible causes
- Additional information
- Diagnostic step-by-step procedure (Steps 1–6)
- Verification drive cycle instructions
Applies to these models
This PACCAR MX P3796 DPF manual applies to 2013 PACCAR MX diesel engines equipped with aftertreatment diesel particulate filter systems and EAS-3 ECU engine control units. For official technical resources, visit PACCAR official site.
Who needs this PACCAR MX P3796 DPF manual
Diesel engine mechanics, workshop owners, and technicians diagnosing PACCAR MX engine fault codes need this guide. The MX P3796 DPF manual is essential for understanding soot load diagnostics and performing DPF regeneration tests using DAVIE diagnostic software.
The diagnostic procedure covers inspection, fault code checking, DPF regeneration testing, fault code clearing, and a verification drive cycle taking up to 45 minutes to one hour. Key troubleshooting points include identifying light-load operating conditions, base engine malfunctions causing excessive soot, inhibit switch activation preventing active regeneration, and low exhaust temperatures exiting the turbocharger.
The manual emphasizes that engine protection derate is enabled when soot load exceeds limits, reducing engine torque output. Active DPF regeneration requires adequate duty cycle operation and sufficiently high exhaust temperatures; the MX P3796 DPF indicates these conditions are not being met. If all troubleshooting steps are completed without resolution, technicians are directed to contact the Engine Support Call Center at 1-800-477-0251 for further assistance.
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