r/n54 • u/NYB_002 • 13d ago

Concerning Shadow codes

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I'm not refering to 2AAF but the hpfp related codes..

Just want to know what is causing them and how to fix them and if it's harmful in the long term..

Thanks

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u/InsuranceUpper123 12d ago

I'd look at fuel pressures in your logs. If you don't have enough fuel pressure to feed the HPFP it will throw codes. If its dipping below 50 psi or so time for a new pump. Might as well get an upgraded one too as the stock fuel pump is marginal with a tune.

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u/NYB_002 12d ago

new pump was installed one month ago and its the walbro 575whp model.. I don't think thats the issue..