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P228D and P0089 Need Help

99hocamaro
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99hocamaro New Member

99hocamaro

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Background. 2018 Silverado was cammed only.

Since then i have pulled the engine done the following mods:

GPI Drop in Pistons

CID cylinder heads

LT4 Injectors and HPFP

535 In tank pump

Procharger D1sc.

 

Issue: Truck ran good for 100 miles then after 1 pull i got the codes P228d and P0089 indicating the rail pressure was too high.

 

Changed out the following parts:

New HPFP

New Injectors

New Low Pressure Pump

New Rail Sensor

New LP Fuel line sensor

New GM Harness for the fuel rails

Pulled front cover and inspected to make sure i didnt jump timing. 

 

Still have the issue and I'm not sure what else to look at?

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