Powertrain, generic (extended)

P228D Fuel Pressure Regulator A Exceeded Control Limits - Pressure Too High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P228D is the opposite of P228C: measured rail pressure stays above the setpoint for too long although regulator A should be cutting delivery. GM's gasoline table 25OBDG03A flags it when the high-pressure pump supplies more than requested for 10 of 12.5 s, as Type A; its 2018 diesel table uses minus 13 MPa with the metering unit in closed loop (Type B), and table 24OBDG07 minus 3 MPa for 7 s. Causes range from a pump control valve that will not shut off, via a pressure sensor reading wrong, to calibration: GM bulletin 17-NA-069 cures P228D on 5.3 L and 6.2 L V8s by reprogramming, and PACCAR bulletin E114 links it, with P0094, to defective unit pumps on MX-13 truck engines. Expect harsh running or derated power.

Likely causes

Pump control or metering valve not reducing delivery
Engine control software needing an update
Rail pressure sensor reading too high
Defective unit or high-pressure pump (truck engines)

Symptoms

  • Check engine light
  • Louder injection noise or rough idle
  • Reduced power in some cases

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–1,800
Time0.5–4 h

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

Parts involved

fuel pressure regulatorhigh pressure fuel pump

Related codes

P228CP229BP0088P0089P2C9D

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