Fuel pressure to high code/ Replaced part code came back
Truck set P0088 fuel pressure to high tested circuit found to be good. Replaced Fuel Pressure Regulator. Truck demands 15000 @idle. Getting 15000, but still setting code P0088.
No smoke, No knock. No air in fuel line.
Very possible that the truck has been tuned? Also i believe that there is a reflash for this code.
Is the fuel pressure reading taken via scan tool?
I dont have any specs but 15,000psi seems high for idle.
That is what I was getting at. I'm not a diesel expert by any means. Also I couldn't pull up that particular vehicle, but a 2009 Silverado with a 6.6 stated "approximately 40 MPa (5,802 psi) with the engine cold, and 30 MPa (4,351 psi) at operating temperature. Based off wiki they both should be a LMM 6.6 engine.
Check the software version. Reflash as needed. The high pressure fuel pressure is controlled by the PCM by using the fuel volume valve in the high pressure fuel pump. Can you change the fuel pressure with your scan tool? 15K PSI at idle is a tad high. Either the software is askew, or something is wrong with the pump control. If perchance you do remove the fuel volume control solenoid, take a…