Powertrain, generic (extended)

P2296 Fuel Pressure Regulator B Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2296 is set when the control line of fuel pressure regulator B has contact with supply voltage. GM's 2018 diesel ECM checks this with its low-side driver switched on: if the line still shows a voltage equivalent to 0.5 Ω or less towards power, the sample fails, again with 44 of 88 samples and Type B. VW's 2014 Passat quick reference uses a signal voltage above 3.20 V and groups an open line with a battery-voltage short here. In that state the driver cannot pull the valve current through, so the valve stays unpowered and the ECM loses its means of holding the intended rail pressure; hard starting and reduced power follow. Look for the harness rubbing on a battery feed and for a damaged valve connector.

Likely causes

Control wire shorted to a voltage supply
Damaged or corroded regulator connector
Faulty output driver in the engine control module

Symptoms

  • Check engine light
  • Hard starting or stalling
  • Reduced power

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 regulator 2fuel pressure regulator wiring

Related codes

P2295P2294P2293P0092

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