Home » P018B Code: Meaning, Symptoms, and Easy Fix

P018B Code: Meaning, Symptoms, and Easy Fix

Meaning: Fuel Pressure Sensor B Circuit Range/Performance
Mostly Seen On: Ford, Audi, Honda, Subaru, Mazda, and GMS
Symptoms: Engine Light ON, Engine does not start, Poor engine performance
Reasons: Faulty fuel pressure sensor, Faulty PCM, wiring issues, Failed fuel pump
Affected parts: PCM, ECM, FRPS, Fuel Pressure Sensor, Fuel Pump
Repairing Cost: $75-$150 (per hour)
Seriousness: Medium
DIY Repair: No
Required Time: Take one hour
Related Trouble Codes: P018A, P018C, P018D, P018E

It’s critical to comprehend what the P018B code implies and how to resolve a fuel pressure sensor issue as it signals a problem. This article will go through the P018B error code, including its causes, signs, and solutions.


The diagnostic fault code P018B indicates a fuel pressure sensor circuit malfunction. The fuel pressure sensor monitors the fuel system’s pressure and relays that information to the engine control module (ECM). The P018B code is set off when the fuel pressure sensor sends the ECM an erroneous or inconsistent signal.

fuel pressure sensor


A number of furious facts can generate the P018B error,

  • A defective fuel pressure sensor is the most frequent reason for the P018B error code. Inaccurate readings might be caused by a damaged or broken sensor.
  • Wiring problems: The P018B code may be brought on by a faulty wire bringing the fuel pressure sensor and the ECM together.
  • Problems with the fuel system, such as a blocked fuel filter or a failed fuel pump, can cause the P018B error code.


 Many symptoms might result from the P018B error. How to diagnose the P018B Code.

  • The check engine light on your dashboard turning on is the most typical P018B code symptom.
  • Another sign is a poorly performing engine. A malfunctioning fuel pressure sensor might bring on engine problems like a rough idle, hesitancy, or stalling.
  • An automobile may suffer from poor fuel efficiency. Fuel economy may suffer due to the engine burning more gasoline due to a faulty fuel pressure sensor.

How to diagnose the P018B Code? 

If you have the appropriate equipment and experience, diagnosing the P018B error code might be simple. This is how to identify the P018B error code.

Step-1: Check the fuel pressure sensor

If necessary, check for other codes, then diagnose the P018B code. Additional codes can help you diagnose. The P018B code is frequently caused by the fuel pressure sensor. Examine the sensor to look for signs of wear or damage.Check the fuel pressure sensor

Step-2: Examine the wiring

A multimeter may be used to test the sensor to look for continuity and resistance. Examine the cabling that links the ECM to the fuel pressure sensor. Look for any obvious indications of wear or damage, such as frayed wires or damaged connections. Check the wire for resistance and continuity with a multimeter.Examine the wiring

Step-3: Verify the ECM

Examine the fuel system in detail. Check the fuel system after ensuring the wiring and fuel pressure sensor are in excellent shape. Look for any wear or damage on the fuel pump and filter. To check if the fuel pressure is within the manufacturer’s standards, you may also test it with a fuel pressure gauge. The ECM may be faulty if the fuel pressure sensor, wiring, and fuel system are in good working order. Look for any evidence of wear or damage, such as corrosion or burned connections, on the ECM.Verify the ECM

Step-4: Unlock the code

It is mandatory to use a code reader or scan tool to remove the P018B code once the incident has been on the light. Doing so will reset the ECM, and the check engine light Will go out. The fuel pressure sensor, wiring, fuel system, and ECM are all checked for indicators of wear or damage while diagnosing the P018B code. Once the issue is located, you must coordinate with a digital code reader and scan to resolve it and erase the error code. It’s important to speak with a qualified technician to clarify how to identify or resolve the P018B code. 

Preventive Measures

The P018B code might be difficult to avoid since a variety of circumstances can bring it on. Here we enlist some guidelines to reduce the possibility of the P018B code occurring, though:

  • The P018B code may be avoided with routine vehicle maintenance. Follow the manufacturer’s suggested maintenance plan and have a certified technician examine and maintain your automobile regularly.
  • Change the gasoline filter as soon as it has to be changed. The fuel pressure may drop as a result of a blocked fuel filter, setting off the P018B error code. Use premium fuel: Utilizing high-quality gasoline can help avoid issues with the fuel system that could result in the P018B code.
  • Steer clear of polluted or subpar gasoline. The P018B code might be caused by overloading your vehicle, which can stress the fuel system excessively. Drive carefully; harsh driving might harm the fuel system and other parts, resulting in the P018B error code.
  • Extended idling may result in a decrease in fuel pressure and the P018B error code. Aim to keep your car from idle for long periods. In conclusion, preventing the P018B code entails performing routine maintenance, changing the fuel filter, using high-quality gasoline, avoiding overloading and harsh driving, and avoiding prolonged idling.

By taking these precautions, you may lessen the possibility that the P018B code will appear and maintain your car in good working order.

How to Fix the P018B Error Code?

By checking and replacing the fuel pressure sensor, the P018B error can be resolved. The fuel pressure sensor must be changed if it is broken. Verify the wiring. It is necessary to repair or replace the wire if it is broken and connects the fuel pressure sensor to the ECM. Inspecting and fixing the gasoline system can be so much more efficient. The fuel system must be examined and fixed if the P018B code comes from it. This can need changing the fuel pump or the fuel filter.

Repairing cost of the P018B Code? 

The severity and origin of the issue will determine how much it will cost to fix the P018B code. The following are some probable repair expenses linked to the P018B code: Replacement of the fuel pressure sensor: Depending on the make and model of your car and where the sensor is located, the price to replace the fuel pressure sensor can range from $100 to $250.

Repair or replacement of the wire can cost between $50 and $200, depending on the degree of the damage and where the wiring is located, if the cabling connecting the fuel pressure sensor to the ECM is the issue. Fuel filter replacement costs can range from $50 to $100, depending on the make and model of your car, and where the filter is located in a blocked fuel filter is the root cause of the P018B code. Fuel pump replacement: The cost to repair a fuel pump that is malfunctioning and triggering the P018B code can range from $300 to $1,000, depending on the brand, model, and position of the pump in your car.

Replacement of the ECM

Depending on the make, model, and location of your car, replacing the ECM might cost anywhere from $500 to $1,500. It’s important to remember that these are only estimates and that final repair costs may differ based on your vehicle’s unique needs and the location of the repair facility. If you need to find the source of the P018B error, some repair businesses may also charge a diagnostic cost.

Vehicle Parts that are related to the P018B code

P018B code is related to your vehicle’s fuel system. Here are some parts that are commonly associated with the P018B code, 

Fuel pressure sensor: 

The engine control module receives a signal from the fuel pressure sensor, which gauges the fuel pressure in the fuel system (ECM). The sensor may malfunction or fail, resulting in the P018B error code.fuel system

Fuel filter:

Before the gasoline reaches the fuel injectors, the fuel filter cleans out any impurities. The P018B error code may be set off by a loss in fuel pressure caused by a dirty or clogged fuel filter.Fuel pump

Fuel pump:

The fuel injectors get fuel from the gas tank via the fuel pump. The P018B code may be set off if the fuel pump malfunctions or fails, which might result in a loss in fuel pressure. The fuel pressure sensor to ECM wiring is connected via a wire that might corrode or damage over time. The P018B code may result from this if the sensor’s signal is disturbed.

ECM of the car: 

The ECM controls the fuel system using data it receives from the fuel pressure sensor and other sensors in the car. An ECM malfunction or failure may set off the P018B error code. 

What if you don’t fix it quickly?

A gasoline system issue in your car might be indicated by the P018B code, which could have a number of detrimental effects. The P018B code may have some drawbacks:

Reduced fuel efficiency: 

Your car may use more gasoline than usual if the P018B code is present, resulting in decreased fuel economy and higher petrol prices.

Engine performance problems: Your engine may operate badly due to the P018B code, with signs including rough idling, hesitancy, or stalling. Reduced performance and a worse driving experience might result from this.

Damage to other parts:

The fuel injectors or fuel lines may be harmed if a malfunctioning fuel pump or another component brings on the P018B code. Future expensive repairs might result from this. Driving safety issues: If the P018B code is causing your engine to perform badly, this might pose a threat to your safety, particularly while merging or passing.

Emissions issues: 

Your vehicle’s emissions may grow if the P018B code is causing your engine to operate inefficiently, raising environmental issues. The P018B code may have a number of drawbacks, such as decreased fuel economy, issues with engine performance, harm to other fuel system components, safety concerns, and emissions problems. If you want to stop additional damage and guarantee your vehicle’s safe and effective functioning, it’s critical to have the issue quickly assessed and fixed by a trained mechanic.

Common Mistakes during Diagnosing the P018B Code

Incorrect diagnosis might fail the Powertrain Control Module. The pressure sensor can have a flaw, and your mechanic might have neglected to fix it. There could be some wiring problems, and you did not correctly handle the issue.


The trouble code P018B indicates an issue with the fuel pressure sensor circuit. Poor engine performance and decreased fuel efficiency are only two of the symptoms that it might produce. Diagnosing and correcting the issue as soon as you encounter this code is crucial to prevent additional harm to your car.

Hi, I am Henry, the owner of this website. If you are a DIY car enthusiast like me and are looking for an all-purpose OBD2 scanner, you’ve come to the right place. With 5+ years of experience in the automobile industry, I have in-depth knowledge about most of the OBD2 scanners regarding their software versions, firmware, features, updates, and compatibility. I love reviewing these gadgets after using and testing them personally. As a result, I always try to provide my honest opinion on the overall product quality.


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