P018B: The fuel-pressure sensor B circuit has a range or performance fault.
Meaning, symptoms, causes and checks
The fuel-pressure sensor B circuit has a range or performance fault. The definition does not label actual fuel pressure as simply too high or too low.
Affected system: Powertrain
Symptoms
- A warning lamp may accompany uneven engine running, hesitation or occasional stalling.
- Engine output can be limited if the fuel-pressure feedback is unreliable.
Possible causes
- Fuel-pressure sensor B may deliver an unstable or implausible signal.
- Damaged conductors, loose terminals or corrosion in the sensor circuit can alter the reported value.
What to check
- Confirm P018B and note any accompanying fuel-system or electrical codes.
- Inspect the sensor B connector and its wiring for corrosion, loose contacts or damaged insulation.
- Compare the live fuel-pressure signal and relevant electrical tests with the vehicle's service specifications before replacing components.
Also written as: P018B-00, P018B00, PO18B (some scan tools add the fault-type byte, e.g. -00).