Code Definition

P018B — Fuel Pressure Sensor Signal Out of Range - Sensor 2

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P018B

P018B is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P018B is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P018B is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

This fault code is set when the engine control module (ECM) detects that the signal from the second fuel pressure sensor, referred to as Sensor 'B', is outside of its expected operational range. This can indicate either a signal that is too high or too low compared to what the ECM anticipates under normal conditions. This discrepancy may be due to a malfunctioning sensor, issues in the sensor's wiring or connections, or actual variations in fuel pressure that the sensor is accurately detecting but are abnormal.

Quick Facts