PACCAR MX P0094 is the fault code chapter the 2013 PACCAR MX Diagnostic Service Manual publishes for “Common rail pump unit control – Incorrect”. The 11-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 | P0094 |
| Fault code information | 1 trip MIL plus 1 trip Stop Engine lamp, 3 drive cycle recovery, freeze frame type Fuel |
| Source manual | 2013 PACCAR MX Diagnostic Service Manual |
| Pages | 11 |
| File size | 0.9 MB |
| Format | |
| Language | English |
What sets PACCAR MX P0094 active
The chapter covers the control of common rail pump units 1 and 2 (L092–L093), which supply fuel to the common rail. The code reports that the control of a common rail pump unit is incorrect. A DAVIE Quick Check is run after the corrective action to confirm the trouble code has cleared.
Component and wiring checks
- Common rail pump units 1 and 2 (L092–L093) with their solenoid connectors and sealing rings
- Roller lifter and pump unit cam that drive the internal plunger
- Check valve in the outlet bore that stops fuel flowing back from the rail
Possible causes and repair notes
- Incorrect solenoid control of a common rail pump unit by the PCI ECU
- Wiring or connector faults on the pump unit solenoid circuit
- A faulty common rail pump unit
The manual explains the pump operation in detail: the internal plunger is actuated by a roller lifter on the camshaft, each pump has three pump events every two crankshaft revolutions, and the ECU briefly energises the solenoid so the internal valve closes off the fuel gallery. The earlier the solenoid is activated during the up stroke, the more fuel in milligrams per stroke reaches the rail. Company and product background is on the official PACCAR website.
Who needs this PACCAR MX P0094 chapter
Heavy-duty diesel technicians and fleet shops reach for PACCAR MX P0094 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.
Related manuals library
