PACCAR MX P0087 is the fault code chapter the 2013 PACCAR MX Diagnostic Service Manual publishes for “Fuel pressure – Data valid but too low, most severe”. The 15-page PDF is PACCAR’s own troubleshooting write-up for EPA2013 MX engines, reproduced exactly as the factory issued it.
Document details and coverage
| Brand | PACCAR |
|---|---|
| Group | DTCs / MX Engines (EPA2013) |
| Fault code | P0087 |
| Fault code information | 1 trip Stop Engine lamp, 3 drive cycle recovery, freeze frame type Fuel |
| Source manual | 2013 PACCAR MX Diagnostic Service Manual |
| Pages | 15 |
| File size | 1.0 MB |
| Format | |
| Language | English |
What sets PACCAR MX P0087 active
The document covers the low-pressure fuel supply side of the MX engine, measured at the end of the low-pressure fuel supply gallery. The code reports a fuel pressure that is valid but too low in its most severe band, which limits engine torque. Each corrective action is followed by a DAVIE Quick Check to confirm the trouble code has cleared.
Component and wiring checks
- Fuel pressure sensor (F801) at the end of the low-pressure fuel supply gallery
- Fuel temperature sensor (F803) in the gallery between the common rail pump units
- Fuel filtration module (L097) with its hydraulic overviews for MX-11 and MX-13
Possible causes and repair notes
- Low fuel pressure in the low-pressure supply gallery
- Restriction or air entry in the fuel filtration module (L097)
- A faulty fuel pressure sensor (F801) or its wiring
At fifteen pages this is one of the longest fault code chapters in the manual. It documents how low fuel pressure limits engine torque, how a very low fuel temperature blocks automatic fuel module water draining because any water present may be frozen, and how a high fuel temperature also limits torque. Unresolved cases go to the PACCAR Engine Support Center. Company and product background is on the official PACCAR website.
Who needs this PACCAR MX P0087 chapter
Heavy-duty diesel technicians and fleet shops reach for PACCAR MX P0087 when the code lands on a DAVIE scan and the repair has to follow the factory sequence instead of guesswork.
The complete PDF sits in the DiagTechPro manuals library; a free account is required to download it.
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