2012 pete paccar mx13 epa 10 low power

I would start with a thorough engine management cleaning. EGR cooler flush and sensor/ tube cleaning. Make sure the EGR and BPV valve calibrations are completed. Adjust the overhead. Are all common areas of concern for low power complaints.

 

Absolute is true reading, relative is a "gauge" reading that has barometric pressure already figured in. Fuel pressure is a little low, regulator is on back of cylinder block, square manifold. You can order just valve, they are usually fractured.
If you have the Texa, does it monitor fueling state to see what is limiting fueling if anything. As @Goodysnap posted, air management cleaning, EGR cooler and overhead usually cures 90% of driveability issues.

 

Here you go, report findings.

 

The split low side regulator will most certainly log low fuel pressure under load. Haven’t seen one bad in ages. That updated part has been out for years.

If you looking for a smoking gun, monitor boost while under load or wing a new sensor in it (if you can get one). Plugged sensors are very common.

 

If in derate would have a P1496 or P1495. Never used Texa, but what you arelooking for in monitor the quality fuel requested mg/stroke and engine mode. Modes include protection, standard, SCR high efficiency, SCR warm up, DPF Regen, SCR super high efficiency, engine brake, cranking . Under hard pull, mg/stroke should read at what emissions sticker on intake says is max for your rating.

 

Boost at 40 is way too high. Most likely tube from manifold to exhaust gas pressure sensor is broke. Epa 10s usually dont hit 30psi.