Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

2021 chevrolet l5p duramax p2293 p0172 high fuel rail pressure

  • ptebo1
  • ptebo1's Avatar Topic Author
  • Offline
  • Senior Member
  • Senior Member
More
3 weeks 5 days ago #92779 by ptebo1
2021 chevrolet l5p duramax p2293 p0172 high fuel rail pressure was created by ptebo1
Hi. Im having a diffucult time troubleshooting a 2021 duramax l5p high pressure fuel system issue. I have already replaced both fuel pressure regulators, and the fuel rail pressure sensor and connector. The issue is it keeps setting dtcs p2293 fuel pressure regulator 2 performance and p0172 fuel system rich. When watching the high pressure fuel system data, i can see the command for 4500 psi, and the pressure regulator #2 command for 10% but rail pressure is measured at 17,000 p.s.i. ive replaced the regulator no.2 twice now and theres no sign of contaminated diesel. 

Please Log in or Create an account to join the conversation.

  • Chad
  • Chad's Avatar
  • Offline
  • Moderator
  • Moderator
  • I am not a parts changer.
More
2 weeks 5 days ago #92796 by Chad
Replied by Chad on topic 2021 chevrolet l5p duramax p2293 p0172 high fuel rail pressure
It seems that the computer is trying to reduce pressure, but can't. I would check for a restricted return line, be it a clog, kink, or crimp.
"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
I have learned more by being wrong, than I have by being right. :-)

Please Log in or Create an account to join the conversation.

Time to create page: 0.268 seconds