P018E Fuel Pressure Sensor B Circuit Intermittent/Erratic

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). P018E covers a signal that jumps faster than real pressure can change or drops out briefly without staying low or high – typically a loose contact or chafed wire; on GM-style systems where the pump module sends the value over CAN, a disturbed transmission is also possible. GM and Ford do not use this code in the documents checked, so no manufacturer thresholds were found; the description rests on CARB and component information.

Likely causes

Symptoms

• Check engine light on (often intermittent)
• Brief stumble or hesitation
• Occasional starting problems

Repair estimate

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

Parts involved

Related codes

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