Intermittent code 559

[Rawze]

(03-07-2022 )Heavyhaulmark Wrote:  When we did the pressure test, it stayed steady @ 28900-29300 psi. The mechanic didn't officially time it but we watched the pressure drop to -1200psi after a few minutes. On another note, Today it has developed a loud squeal on starting but it is now choking down, starving for fuel and dying much more quickly than before. We haven't been able to pinpoint the squeal as of yet....

loud squeal?

maybe to the obvious and remove all the belts... check to see it if it a pulley or, alternator, or AC compressor seizing up?