Powertrain, generic · Fuel and air metering

P018D Fuel Pressure Sensor B Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

Fuel pressure sensor B is a second fuel pressure sensor; which one is up to the manufacturer. On GM it is the low-pressure sensor in the supply line of direct-injection engines (0–743 kPa), read by the engine module or the fuel pump control module; on Ford engines with dual injection it is the sensor on the port-injection rail (0.5–4.5 V for about 0–70 psi). Sensor A is the high-pressure rail sensor (P0190–P0194). P018D means the signal voltage is above its upper limit – usually an open sensor ground or a signal wire shorted to the 5 V reference or battery voltage. GM sets it above 96 % of the reference (about 4.8 V, equal to 743 kPa) or above 4.86 V when read by the fuel pump module; two trips. Ford sets it above 4.88 V for 8 s. Water ingress in the connector is a common trigger. A substitute value is used.

Likely causes

Sensor ground open
Signal wire shorted to 5 V or battery voltage
Sensor faulty
Connector corrosion or water ingress

Symptoms

  • Check engine light on
  • Starting problems
  • Lack of power
  • Sometimes no symptoms

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–300
Time0.5–2 h

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

Parts involved

fuel pressure sensor bsensor wiringsensor reference voltage

Related codes

P018CP018AP018BP018EP0193

References: law.cornell.edu, gsi.ext.gm.com, gsi.ext.gm.com, fordservicecontent.com.