Powertrain, generic (extended)

P2294 Fuel Pressure Regulator B Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2294 is the open-circuit check of the drive line to fuel pressure regulator B. GM's 2018 diesel ECM tests the low-side driver of the rail pressure regulator valve while the output is switched off: a voltage indicating more than 200 kΩ between signal and ground counts as open, and 44 failures in 88 samples at 6.25 ms set the code as Type B. VW's 2014 Passat quick reference uses a signal voltage between 1.40 and 3.20 V or an implausible signal pattern. Broken wires, a pushed-back connector pin or an interrupted valve coil are the usual findings. Without control of the valve the ECM cannot release rail pressure as intended and may limit power. P2295 and P2296 split shorts to ground and to supply.

Likely causes

Broken wire in the regulator harness
Loose, corroded or pushed-back connector pin
Open coil in the pressure regulator valve
Faulty output driver in the engine control module

Symptoms

  • Check engine light
  • Reduced power or emergency mode
  • Unstable idle or hard starting

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–800
Time0.5–3 h

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

Parts involved

fuel pressure regulatorfuel pressure regulator wiring

Related codes

P2293P2295P2296P0090

References: gsi.ext.gm.com, static.nhtsa.gov, law.cornell.edu.