P018DFuel Pressure Sensor B Circuit High
- 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). 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.
- What you may notice
- Check engine light on
- Starting problems
- Lack of power
- Sometimes no symptoms
- Likely causes
- LikelySensor ground open
- PossibleSignal wire shorted to 5 V or battery voltage
- PossibleSensor faulty
- PossibleConnector corrosion or water ingress
- 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: €50 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.