PACCAR MX P0266 is the fault-code chapter of the 2013 PACCAR MX Diagnostic Service Manual covering a decrease in combustion in cylinder 2 relative to the other cylinders, without causing complete failure. It is a reference entry rather than a troubleshooting tree, printed on a single page of the manual. Each field on that page, from diagnostic condition through to verification drive cycle, is answered by the same line: contact the Engine Support Center.
Document details at a glance
| Brand | PACCAR |
|---|---|
| Model coverage | PACCAR MX engines, EPA 2013 emissions level |
| System group | DTCs, MX Engines EPA2013 |
| Source publication | 2013 PACCAR MX Diagnostic Service Manual, page 225 |
| Pages | 1 |
| File size | 0.3 MB |
| Format | |
| Language | English |
What the PACCAR MX P0266 chapter covers
- The wording PACCAR uses for the code, which is what you match against a DAVIE readout
- Its position in the cylinder contribution run of codes covering all six cylinders
- Confirmation that no set or reset condition is published for it
- Confirmation that no wiring diagram or technical data table is printed
- Confirmation that no possible-cause list or numbered procedure exists
- The single published instruction: contact the Engine Support Center
Diagnostic step sequence and verification
Inside PACCAR MX P0266 the procedure runs as follows. No numbered sequence is printed, so the practical route runs through the neighbouring chapters instead. The cylinder unbalance code P0315 in the same manual explains that misfire detection is based on piston acceleration converted to crankshaft acceleration, and it names fuel injector failure and mechanical engine failure as the causes to weigh. The injector solenoid chapters give the electrical checks for the same cylinder.
Trucks and engines it applies to
The entry belongs to the EPA 2013 PACCAR MX fault code set used on Kenworth and Peterbilt trucks, and it is read with DAVIE like every other code in that group. Model programmes and dealer support for these engines are listed on the PACCAR corporate site.
Who needs the PACCAR MX P0266 chapter
Technicians who pull this code from a truck need the page to confirm they are not missing a hidden procedure, and library builders need it to complete the cylinder contribution series.
The complete PDF of the PACCAR MX P0266 chapter is filed in the DiagTechPro manuals library, where a free account is required to download it alongside the rest of the MX Engines EPA2013 fault-code set.
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