PACCAR MX P104B is the diagnostic trouble code documented on this 8 pages extract from the 2013 PACCAR MX Diagnostic Service Manual, published by PACCAR for EPA2013 MX engines. PACCAR prints the fault as “Boost pressure – Data valid but too high”, in the manual’s standard fault code layout.
Document details for PACCAR MX P104B
| Brand | PACCAR |
|---|---|
| Model coverage | PACCAR MX engines, EPA2013 emissions level |
| System / group | DTCs / MX Engines (EPA2013) |
| Source publication | 2013 PACCAR MX Diagnostic Service Manual |
| Fault code | P104B — Boost pressure – Data valid but too high |
| Pages | 8 |
| File size | 0.6 MB |
| Format | |
| Language | English |
Fault code summary and monitor data
The manual lists 2 trip MIL with 3 drive cycle recovery, no readiness group and a crankcase freeze frame type. The diagnostic runs at steady load, above 50 C coolant and between minus 15 and 40 C ambient.
- Code number
- Fault code description
- Fault code information
- Description of component(s)
- Set condition of fault code
- Reset condition of fault code
- Possible causes
- Diagnostic Step-by-Step
- Verification Drive Cycle
Component and system background
Boost pressure is measured in the inlet manifold near cylinder 1 by sensor F802. The value determines the smoke limit, feeds the soot and NOx emission calculations, and is used to calculate exhaust gas mass flow for DEF dosing estimation by the EAS-3 system as well as the temperatures after the compressor and before the turbine.
Set and reset conditions for PACCAR MX P104B
The code is set when the PCI ECU (D420) detects that the measured boost pressure is more than 0.5 bar (7.3 psi) higher than the expected boost pressure for more than 50 seconds, and it goes inactive when the fault is no longer detected. Listed causes are boost pressure sensor deviation and turbocharger failure. The step-by-step procedure opens by investigating related trouble codes before any component is condemned, which matters because the same sensor feeds several emission calculations.
Applies to EPA2013 MX engines
The PACCAR MX P104B entry sits in the DTCs / MX Engines (EPA2013) section, so it applies to PACCAR MX engines built to that emissions level. Manufacturer product information is published on the PACCAR corporate website.
Who needs the PACCAR MX P104B fault code page
Technicians reading a live code, foremen writing an estimate and fleet managers deciding whether a truck stays in service all need the manufacturer wording rather than a generic code list.
The full PDF for MX P104B is in the DiagTechPro manuals library; a free account is required to download it.
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