P228B Please Help / Advice

Kydiesel2017

New member
Sep 15, 2021
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Looking for advice.

Vehicle came in for glow plugs and updated fuel pressure sensor. (See pictures below)

2018 duramax L5P. The truck has had all 8 glow plugs replaced and updated the ECM software to the newest version by a Chevrolet dealer. We have installed the new fuel pressure sensor and connector on the pigtail harness, followed the GM tech talk procedures. All GM OEM AC Delco parts. Replaced frame pump (low pressure pump) at customer’s request.

Drove it over 50 miles yesterday with no issues. The truck never died. It didn’t hesitate. No codes. Full power.

We get in it today and it starts throwing codes for fuel pressure regulator 2 control.

Anyone have advice ?

Edit - We have used all data, shop key pro and google. We can’t find any information or even a troubleshooting tree to follow.
 

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