What Does Code P0108 Mean? An Explanation for Car Owners

AvatarByCarl Frisch

Code P0108 is a diagnostic trouble code (DTC) for a malfunction in the Manifold Absolute Pressure (MAP) sensor circuit. This DTC indicates that the MAP sensor is providing a signal that is out of range for the engine’s operating conditions, and it can be caused by a number of factors such as a faulty MAP sensor, wiring issue, or vacuum leak. The MAP sensor monitors the amount of air entering the engine, and this data is used by the vehicle’s computer to adjust the fuel/air ratio in order to optimize performance and efficiency. If the MAP sensor is not working properly, it can cause poor running conditions and reduced fuel economy. In order to diagnose this problem properly, it is important to check all related components such as wiring and vacuum hoses for any issues. It may also be necessary to replace the MAP sensor if it has failed or become damaged.

What Does the Code P0108 Mean?

Code P0108 is a generic trouble code that indicates a malfunction within the intake manifold pressure sensor circuit. This code is typically triggered when the engine control module (ECM) detects an abnormal voltage reading from the pressure sensor. The ECM interprets this as an indication of an abnormally high intake manifold pressure, which can cause engine performance issues such as poor fuel economy, poor acceleration, and reduced power output.

Common Causes of Code P0108

The most common causes of code P0108 include vacuum leaks, faulty intake manifold pressure sensors or wiring harnesses, and corroded connectors or terminals. Vacuum leaks can cause an abnormal increase in intake manifold pressure, while faulty sensors or wiring harnesses can cause the ECM to misinterpret the data it receives from the pressure sensor. Corroded connectors or terminals can also interrupt communication between the ECM and pressure sensor.

Symptoms of Code P0108

When code P0108 is triggered, drivers may experience a number of engine performance issues such as poor fuel economy, poor acceleration, reduced power output, and illuminated check engine light. These symptoms are often accompanied by a decrease in engine RPMs and a decrease in throttle response.

Diagnosing Code P0108 in Automobiles

Diagnosing code P0108 requires a few steps: first, check for vacuum leaks; second, inspect the intake manifold pressure sensor and wiring harness; third, perform a voltage test on the intake manifold pressure sensor; fourth, test the connector pin signal voltage with a digital volt/ohmmeter; finally verify repairs with a scan tool androad test. Checking for vacuum leaks should always be done first as they are often easy to fix and may resolve any issues you are experiencing with your vehicle’s performance. If no vacuum leaks are found then proceed to inspecting the intake manifold pressure sensor and wiring harness for signs of wear or damage. If none is found then move on to performing voltage tests on both components to identify any potential problems that may be causing your vehicle to run poorly. Once all tests have been completed it’s important to verify repairs with a scan tool and road test before taking your vehicle back out onto public roads again.

Common Problems That Can Trigger Code P0108

Common problems that can trigger code P0108 include vacuum leaks, faulty intake manifold pressure sensors or wiring harnesses, and corroded connectors or terminals. Vacuum leaks can cause an abnormal increase in intake manifold pressure which can lead to engine performance issues such as poor fuel economy and poor acceleration. Faulty sensors or wiring harnesses can also lead to inaccurate readings from the ECM which will ultimately result in similar issues. Corroded connectors or terminals can also interrupt communication between the ECM and pressure sensor which will prevent it from functioning properly leading to decreased engine performance as well as illuminated check engine lights on your dashboard display panel.

How To Fix Code P0108

Repairing code p0108 requires taking care of each of these potential causes one at a time: first repair or replace any vacuum leaks you may discover during your initial inspection; second replace any faulty intake manifold pressure sensors or wiring harnesses you may find during inspection; finally check for any corroded connectors or terminals that could be causing communication issues between components within your vehicle’s system.. Once all repairs have been made it’s important to test drive your vehicle under various driving conditions in order to make sure all systems are functioning correctly before taking it back out onto public roads again

What Does Code P0108 Mean?

Code P0108 stands for Manifold Absolute Pressure (MAP) Sensor Circuit High Input. This code is triggered when the vehicle’s on-board computer detects that the MAP sensor is reporting a signal voltage that is too high. The MAP sensor is responsible for monitoring the pressure within the intake manifold, and if it detects an abnormal pressure, it will send a signal to the computer to alert it of a problem.

Common Symptoms of Code P0108

The most common symptoms of code P0108 are poor fuel economy, stalling, and decreased engine power. Other symptoms may include a decrease in torque output, hesitation when accelerating, and rough idling. If left unfixed, code P0108 can cause significant damage to your car’s engine components over time.

Diagnosing Code P0108

The first step in diagnosing code P0108 is to visually inspect all wiring and vacuum hoses connected to the MAP sensor for any signs of damage or wear. If everything looks normal, then a scan tool should be used to check for any codes stored in the car’s computer system. Once any codes have been identified, they should be addressed before continuing with the diagnosis of code P0108.

Next, a digital volt/ohmmeter should be used to check the voltage output from the MAP sensor against manufacturer specifications. If there is an abnormally high reading then it indicates that the MAP sensor needs to be replaced. It’s also important to check for any open or short circuits in the wiring harnesses connected to the MAP sensor as these can cause issues with its operation as well.

Preventative Maintenance To Avoid Code P0108

Regularly inspecting vacuum hoses and connections as well as replacing intakes manifold pressure sensors at manufacturer’s recommended intervals can help prevent code P0108 from occurring. Additionally, ensuring that all electrical connectors are clean and free from corrosion will help ensure proper operation of all components related to this code.

Cost Of Replacing Parts Related To Code P0108

The cost of replacing parts related to code P0108 can vary depending on your car make and model as well as where you purchase them from but generally speaking intakes manifold pressure sensors range in price from around $50 – $150 USD depending on your make and model of car.

Professional Services To Help Fix Code P0108

If you’re feeling unsure about tackling this issue yourself then you can always hire a professional mechanic who will have access to more specialized tools such as diagnostic scanners which can help pinpoint the exact cause of your problem quickly and accurately so that repairs can be made with minimal downtime for your vehicle.

Tips For Troubleshooting Problems Related To Code P0108

When troubleshooting problems related to code P0108 it’s important to remember some basic tips such as cleaning any corroded electrical connectors as these can interfere with proper functioning of components such as MAP sensors as well as checking for open or short circuits in wiring harnesses connected to them which can also cause performance issues if left unchecked or unresolved over time.

Tools Needed When Diagnosing Problems Related To CodeP 0108

When diagnosing problems related to codeP 0108 you’ll need some basic tools such as a digital volt/ohmmeter which will allow you measure voltage output from components such as MAP sensors against manufacturer specifications and also a scan tool which will allow you access information stored in your car’s computer system so that any related codes can be identified quickly and accurately thus allowing repairs or replacements parts if needed be made quickly with minimal downtime for your vehicle.

FAQ & Answers

Q: What is Code P0108?
A: Code P0108 is a diagnostic trouble code (DTC) that indicates an issue with the intake manifold pressure sensor or the wiring harness connected to it. This code is set when the powertrain control module (PCM) detects a voltage reading outside of the normal range.

Q: What are the Symptoms of Code P0108?
A: Common symptoms associated with code P0108 are engine performance issues, poor fuel economy, and an illuminated check engine light.

Q: How do you Fix Code P0108?
A: To fix this issue, you must first repair or replace vacuum leaks, then replace the intake manifold pressure sensor and wiring harness. Additionally, you should also check for corroded connectors or terminals.

Q: What is the Cost of Replacing Parts Related to Code P0108?
A: The cost to replace parts related to code P0108 can range from $50-$500 depending on the type of vehicle and part that needs to be replaced.

Q: What Tools Are Needed When Diagnosing Problems Related to Code P0108?
A: When diagnosing problems related to code P0108, you will need a digital volt/ohmmeter and a scan tool in order to properly diagnose and repair the issue.

In conclusion, code P0108 is an indication that the Manifold Absolute Pressure (MAP) sensor circuit has a problem. This can be caused by a faulty MAP sensor, an open or shorted wiring harness, or a faulty PCM. It is important to diagnose and repair the underlying cause of this code in order to restore normal vehicle operation.

Author Profile

Carl Frisch
Carl Frisch
With more than 30 years in the bicycle industry, I have a strong background in bicycle retailing, sales, marketing and customer service. I have a passion for cycling and a dedication to excellence. As a manager, I worked diligently to increase my capabilities and responsibilities, managing up to eleven mechanics (at Palo Alto Bicycles) and later as a working partner in my own store.

As the shop owner of Spoke n’ Word Cycles in Socorro, NM, the success of the mission was my responsibility, which I pursued passionately since we opened in 2003 through the spring of 2011. I am adept at managing owned and loan inventory, preparing weekly & annual inventory statements, and managing staff. The role as managing partner also allowed me tremendous freedom. I used this personal freedom to become more deeply involved in my own advancement as a mechanic, to spearhead local trail building, and advocating for cycling both locally and regionally.

As a mechanic, I have several years doing neutral support, experience as a team mechanic, and experience supporting local rides, races, club events. I consistently strive to ensure that bicycles function flawlessly by foreseeing issues and working with the riders, soigners, coaches and other mechanics. Even with decades of experience as a shop mechanic and team mechanic, and continue to pursue greater involvement in this sport as a US Pro Mechanic, and UCI Pro Mechanic.

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