Powertrain, generic (extended)

P2293 Fuel Pressure Regulator B Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2293 checks whether fuel pressure regulator B really controls rail pressure. In GM's 2018 diesel table regulator B is the rail pressure regulator valve; the code sets when, with that valve in charge, rail pressure rises above a calibrated ceiling of 67 to 217 MPa in 160 of 229 samples at 6.25 ms, Type A. VW's 2014 quick reference for the Passat, which still uses the older name regulator 2, flags a gap between commanded and measured pressure beyond plus or minus 1.5 MPa. GM preliminary information PIP5988 for the 2024 3.0 L Duramax (LZ0) advises replacing the high-pressure rail that carries the valve, not the pump, when P2293 appears alone or with P0089. P2294 to P2296 cover the electrical side of the same valve.

Likely causes

Rail pressure regulator valve sticking or worn (often replaced with the rail)
Rail pressure sensor reading wrong
Contaminated fuel affecting the valve
Engine control software issue

Symptoms

  • Check engine light
  • Reduced power or stalling in severe cases
  • Hard starting

Repair estimate

DifficultyHardWorkshop job
Parts and labour€150–1,500
Time1–5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

fuel pressure regulatorhigh pressure fuel pumprail pressure sensor

Related codes

P2294P2295P2296P0089P229B

References: gsi.ext.gm.com, static.nhtsa.gov, static.nhtsa.gov.