P018A Fuel Pressure Sensor B Circuit

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). P018A is the general circuit fault for when a manufacturer does not distinguish low from high. GM and Ford, whose sensor B functions are documented, use P018C/P018D instead, so no manufacturer document using exactly this code was found; the description rests on CARB's circuit monitoring requirement and the component information. When the sensor fails, the control module uses a pre-set value and usually runs the supply pump with fixed control.

Likely causes

Symptoms

• Check engine light on
• Often no noticeable change in driving
• Starting problems or hesitation with fixed pump control

Repair estimate

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

Parts involved

Related codes

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