P018EFuel Pressure Sensor B Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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.
- What you may notice
- Check engine light on (often intermittent)
- Brief stumble or hesitation
- Occasional starting problems
- Likely causes
- LikelyLoose contact or connector corrosion
- PossibleChafed harness
- PossibleSensor faulty internally
- RareCAN transmission from the pump module disturbed
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €30 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.