Powertrain, generic (extended)

P2295 Fuel Pressure Regulator B Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2295 stands for the control line of fuel pressure regulator B touching ground. GM's 2018 diesel ECM detects it with its low-side driver switched off: if the measured voltage corresponds to 0.5 Ω or less towards ground, the sample counts as failed, and 44 of 88 samples at 6.25 ms confirm the fault as Type B. VW's 2014 Passat quick reference describes the same fault as a ground short, with a signal voltage below 1.40 V. Chafed insulation near the rail or pump, water in the connector and a shorted valve coil are typical findings. Because a grounded low-side line can keep the valve energised regardless of command, rail pressure may drift from target and the ECM may reduce power. P2296 is the high counterpart.

Likely causes

Control wire chafed through to ground
Water or corrosion in the regulator connector
Shorted coil in the pressure regulator valve

Symptoms

  • Check engine light
  • Rail pressure too high or unstable, reduced power
  • Rough running

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

P2296P2294P2293P0091

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