This PACCAR P1872 DTC troubleshooting guide provides mechanics and workshop owners with comprehensive diagnostic procedures for resolving fault code P1872 on PACCAR trucks equipped with EPA 2004 MX Europe engines. Published by PACCAR, this technical document covers humidity sensor inspection, electrical testing, and complete repair verification cycles using DAVIE diagnostics software. The guide assumes proper PCI power supply and ground functionality and outlines a structured approach to isolate multiple failure modes.
The PACCAR P1872 manual is essential for accurate fault diagnosis on affected diesel truck engines and includes detailed pin-out references, voltage specifications, and step-by-step component testing procedures.
Document details and specifications — PACCAR P1872 DTC
| Brand | PACCAR |
| Model coverage | MX Europe Engines (EPA 2004) |
| System/Group | DTCs / Emissions Control |
| Publication number | M051720 |
| Year/Revision | 17-Aug-2017 (01.29.2016) |
| Pages | 5 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Table of contents
- P1872 Troubleshooting information
- Step-by-step troubleshooting
- Step 1 – Humidity sensor (F852) checks
- Step 1A – Visual inspection, connections and wiring
- Step 1B – Electrical checks, supply voltage
- Step 1C – Electrical checks, circuit response
- Step 1D – Electrical checks, isolation of short circuit
- Step 2 – Intake pressure and temperature checks
- Step 2A – DAVIE monitor, intake pressure and temperature sensors
- Step 3 – Repair verification
- Step 3A – Repair verification cycles
- Step 3B – DAVIE diagnostics, quick check, OBD readiness monitors
Applies to these models
This PACCAR P1872 DTC document applies exclusively to PACCAR trucks equipped with MX Europe engines meeting EPA 2004 emissions standards. The troubleshooting procedures reference humidity sensor F852, PCI ECU connectors, EAS-3 ECUs, and engine harness assemblies specific to this engine family. Procedures must be performed using DAVIE diagnostic software for accurate fault code clearing and OBD monitor verification. Consult PACCAR’s Rapido technical database for model-specific pin-out locations and current electrical specifications. PACCAR official website
Who needs this PACCAR P1872 DTC manual
Heavy-duty diesel truck mechanics and workshop owners diagnosing fault code P1872 on PACCAR vehicles require this PACCAR P1872 guide. The manual provides step-by-step procedures for humidity sensor inspection, electrical circuit testing, and short-circuit isolation—essential knowledge for efficiently resolving emissions-related faults on MX Europe engines.
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